1.
Gravity wave
–
In fluid dynamics, gravity waves are waves generated in a fluid medium or at the interface between two media when the force of gravity or buoyancy tries to restore equilibrium. An example of such an interface is that between the atmosphere and the ocean, which rise to wind waves. A gravity wave results when fluid is displaced from a position of equilibrium, the restoration of the fluid to equilibrium will produce a movement of the fluid back and forth, called a wave orbit. Gravity waves on an interface of the ocean are called surface gravity waves or surface waves. Wind-generated waves on the surface are examples of gravity waves, as are tsunamis. Wind-generated gravity waves on the surface of the Earths ponds, lakes, seas. Shorter waves are affected by surface tension and are called gravity–capillary waves. Alternatively, so-called infragravity waves, which are due to nonlinear wave interaction with the wind waves, have periods longer than the accompanying wind-generated waves. In the Earths atmosphere, gravity waves are a mechanism that produce the transfer of momentum from the troposphere to the stratosphere and mesosphere, Gravity waves are generated in the troposphere by frontal systems or by airflow over mountains. At first, waves propagate through the atmosphere without appreciable change in mean velocity, but as the waves reach more rarefied air at higher altitudes, their amplitude increases, and nonlinear effects cause the waves to break, transferring their momentum to the mean flow. This transfer of momentum is responsible for the forcing of the many large-scale dynamical features of the atmosphere, thus, this process plays a key role in the dynamics of the middle atmosphere. The effect of gravity waves in clouds can look like altostratus undulatus clouds, and are confused with them. The phase velocity c of a gravity wave with wavenumber k is given by the formula c = g k. When surface tension is important, this is modified to c = g k + σ k ρ, where σ is the surface tension coefficient and ρ is the density. Since c = ω / k is the speed in terms of the angular frequency ω and the wavenumber. The group velocity of a wave is given by c g = d ω d k, the group velocity is one half the phase velocity. A wave in which the group and phase velocities differ is called dispersive, Gravity waves traveling in shallow water, are nondispersive, the phase and group velocities are identical and independent of wavelength and frequency. When the water depth is h, c p = c g = g h, wind waves, as their name suggests, are generated by wind transferring energy from the atmosphere to the oceans surface, and capillary-gravity waves play an essential role in this effect
Gravity wave
–
Surface gravity wave, breaking on an ocean beach.
Gravity wave
–
Wave clouds over
Theresa, Wisconsin, United States.
Gravity wave
–
Atmospheric gravity waves as seen from space.
2.
Wake
–
The wake is the region of disturbed flow downstream of a solid body moving through a fluid, caused by the flow of the fluid around the body. Parachutes deployed into wakes suffer dynamic pressure deficits which reduce their expected drag forces, example applications include rocket stage separation and aircraft store separation. In incompressible fluids such as water, a bow wake is created when a watercraft moves through the medium, as the medium cannot be compressed, it must be displaced instead, resulting in a wave. As with all forms, it spreads outward from the source until its energy is overcome or lost. The non-dimensional parameter of interest is the Froude number, waterfowl and boats moving across the surface of water produce a wake pattern, first explained mathematically by Lord Kelvin and known today as the Kelvin wake pattern. This pattern consists of two lines that form the arms of a chevron, V, with the source of the wake at the vertex of the V. For sufficiently slow motion, each line is offset from the path of the wake source by around arcsin =19. 47° and is made up of feathery wavelets angled at roughly 53° to the path. The inside of the V is filled with transverse curved waves and this pattern is independent of the speed and size of the wake source over a significant range of values. However, the changes at high speeds, viz. above a hull Froude number of approximately 0.5. The angles in this pattern are not intrinsic properties of water, Any isentropic. Furthermore, this phenomenon has nothing to do with turbulence, everything discussed here is based on the linear theory of an ideal fluid, cf. Airy wave theory. Parts of the pattern may be obscured by the effects of propeller wash, and tail eddies behind the boats stern, and by the boat being a large object and not a point source. The water need not be stationary, but may be moving as in a river. This formula implies that the velocity of a deep water wave is half of its phase velocity. Two velocity parameters of importance for the pattern are, v is the relative velocity of the water. C is the velocity of a wave, varying with wave frequency. As the surface moves, it continuously generates small disturbances which are the sum of sinusoidal waves with a wide spectrum of wavelengths. Those waves with the longest wavelengths have phase speeds above v, other waves with phase speeds at or below v, however, are amplified through constructive interference and form visible shock waves, stationary in position w. r. t
Wake
–
Wake pattern generated by a small boat.
Wake
–
Wave cloud pattern in the wake of the
Île Amsterdam (lower left, at the "tip" of the triangular formation of clouds) in the southern
Indian Ocean
Wake
–
Cloud wakes from the
Juan Fernández Islands
Wake
–
Wake patterns in cloud cover over Possession Island, East Island, Ile aux Cochons, Ile de Pingouins
3.
Indian Ocean
–
The Indian Ocean is the third largest of the worlds oceanic divisions, covering 70,560,000 km2. It is bounded by Asia on the north, on the west by Africa, on the east by Australia, the Indian Ocean is known as Ratnākara, the mine of gems in ancient Sanskrit literature, and as Hind Mahāsāgar, in Hindi. The northernmost extent of the Indian Ocean is approximately 30° north in the Persian Gulf, the oceans continental shelves are narrow, averaging 200 kilometres in width. An exception is found off Australias western coast, where the width exceeds 1,000 kilometres. The average depth of the ocean is 3,890 m and its deepest point is Diamantina Deep in Diamantina Trench, at 8,047 m deep, Sunda Trench has a depth of 7, 258–7,725 m. North of 50° south latitude, 86% of the basin is covered by pelagic sediments. The remaining 14% is layered with terrigenous sediments, glacial outwash dominates the extreme southern latitudes. The major choke points include Bab el Mandeb, Strait of Hormuz, the Lombok Strait, the Strait of Malacca, the Indian Ocean is artificially connected to the Mediterranean Sea through the Suez Canal, which is accessible via the Red Sea. All of the Indian Ocean is in the Eastern Hemisphere and the centre of the Eastern Hemisphere is in this ocean, marginal seas, gulfs, bays and straits of the Indian Ocean include, The climate north of the equator is affected by a monsoon climate. Strong north-east winds blow from October until April, from May until October south, in the Arabian Sea the violent Monsoon brings rain to the Indian subcontinent. In the southern hemisphere, the winds are milder. When the monsoon winds change, cyclones sometimes strike the shores of the Arabian Sea, the Indian Ocean is the warmest ocean in the world. Long-term ocean temperature records show a rapid, continuous warming in the Indian Ocean, Indian Ocean warming is the largest among the tropical oceans, and about 3 times faster than the warming observed in the Pacific. Research indicates that human induced greenhouse warming, and changes in the frequency, among the few large rivers flowing into the Indian Ocean are the Zambezi, Shatt al-Arab, Indus, Godavari, Krishna, Narmada, Ganges, Brahmaputra, Jubba and Irrawaddy River. The oceans currents are controlled by the monsoon. Two large gyres, one in the northern hemisphere flowing clockwise and one south of the equator moving anticlockwise, during the winter monsoon, however, currents in the north are reversed. Deep water circulation is controlled primarily by inflows from the Atlantic Ocean, the Red Sea, north of 20° south latitude the minimum surface temperature is 22 °C, exceeding 28 °C to the east. Southward of 40° south latitude, temperatures drop quickly, surface water salinity ranges from 32 to 37 parts per 1000, the highest occurring in the Arabian Sea and in a belt between southern Africa and south-western Australia
Indian Ocean
–
The economically important
Silk Road (red) and spice
trade routes (blue) were blocked by the
Ottoman Empire in ca. 1453 with the fall of the
Byzantine Empire. This spurred exploration, and a new sea route around Africa was found, triggering the
Age of Discovery.
Indian Ocean
–
Extent of the Indian Ocean according to the
CIA World Factbook
Indian Ocean
–
British heavy cruisers
Dorsetshire and
Cornwall under Japanese air attack and heavily damaged on 5 April 1942
Indian Ocean
–
A
dhow off the coast of Kenya
4.
Wave cloud
–
A wave cloud is a cloud form created by atmospheric internal waves. As an air mass travels through the wave, it undergoes repeated uplift, if there is enough moisture in the atmosphere, clouds will form at the cooled crests of these waves. In the descending part of the wave, those clouds will evaporate due to heating, leading to the characteristic clouded. The cloud base on the side is higher than on the windward side. It is possible that simple convection from mountain summits can also form wave clouds and this occurs as the convection forces a wave or lenticular wave cloud into the more stable air above. Wave clouds are typically mid- to upper-tropospheric ice clouds and they are relatively easy to study, because they are quite consistent. As a result, they are being analyzed to increase our understanding of how these upper-level ice clouds influence the Earths radiation budget, understanding this can improve climate models. The streamlines in these clouds have the steepest slope a few kilometers downwind of the lee slope of a mountain and it is in these regions of highest vertical velocity that sailplanes can reach record-breaking altitudes. Wave cloud structure ranges from smooth and simple, to jumbled phases occurring randomly, often, ice crystals can be found downwind of the waves. Whether this happens depends on the saturation of the air, the composition of the ice is currently an active topic of study. The main mechanism for ice formation is homogeneous nucleation, the ice crystals are mostly small spheroidal and irregular-shaped particles. Ice columns make up less than 1%, and plates are virtually nonexistent, multi-level mountain wave clouds form when the moisture in the air above the mountain is located in distinct layers, and vertical mixing is inhibited
Wave cloud
–
This wave cloud pattern formed over the
Île Amsterdam, in the lower left corner at the tip of the triangular formation, in the far southern
Indian Ocean.
Wave cloud
–
Wave cloud pattern in
Tadrart region.
Wave cloud
–
Extensive wave cloud at
Burra, South Australia on 16 Jan 2007.
Wave cloud
–
Unusual wave clouds over the
Aral Sea, seen from NASA's
Aqua satellite on March 12, 2009.
5.
Air mass
–
In meteorology, an air mass is a volume of air defined by its temperature and water vapor content. Air masses cover many hundreds or thousands of miles. They are classified according to latitude and their continental or maritime source regions, colder air masses are termed polar or arctic, while warmer air masses are deemed tropical. Continental and superior air masses are dry while maritime and monsoon air masses are moist, weather fronts separate air masses with different density characteristics. Once an air mass moves away from its region, underlying vegetation. Classification schemes tackle an air mass characteristics, as well as modification, the Bergeron classification is the most widely accepted form of air mass classification, though others have produced more refined versions of this scheme over different regions of the globe. Air mass classification involves three letters, the first letter describes its moisture properties, with c used for [[continental air masses and m for maritime air masses. The second letter describes the characteristic of its source region, T for Tropical, P for Polar, A for arctic or Antarctic, M for monsoon, E for Equatorial. For instance, an air mass originating over the desert southwest of the United States in summer may be designated cT, an air mass originating over northern Siberia in winter may be indicated as cA. The stability of an air mass may be using a third letter, either k or w. An example of this might be an air mass blowing over the Gulf Stream. For example, a series of fronts over the Pacific might show an air mass denoted mPk followed by another denoted mPk, another convention utilizing these symbols is the indication of modification or transformation of one type to another. For instance, an Arctic air mass blowing out over the Gulf of Alaska may be shown as cA-mPk, yet another convention indicates the layering of air masses in certain situations. For instance, the overrunning of an air mass by an air mass from the Gulf of Mexico over the Central United States might be shown with the notation mT/cP. Arctic, Antarctic, and polar air masses are cold, the qualities of arctic air are developed over ice and snow-covered ground. Arctic air is cold, colder than polar air masses. Arctic air can be shallow in the summer, and rapidly modify as it moves equatorward, Polar air masses develop over higher latitudes over the land or ocean, are very stable, and generally shallower than arctic air. Polar air over the ocean loses its stability as it gains moisture over warmer ocean waters, Tropical and equatorial air masses are hot as they develop over lower latitudes
Air mass
–
Lake-effect snow bands near the
Korean Peninsula
Air mass
–
Different air masses which affect North America, as well as other continents, tend to be separated by frontal boundaries
6.
Elevation
–
GIS or geographic information system is a computer system that allows for visualizing, manipulating, capturing, and storage of data with associated attributes. GIS offers better understanding of patterns and relationships of the landscape at different scales, tools inside the GIS allow for manipulation of data for spatial analysis or cartography. A topographical map is the type of map used to depict elevation. In a Geographic Information System, digital models are commonly used to represent the surface of a place. Digital terrain models are another way to represent terrain in GIS, USGS is developing a 3D Elevation Program to keep up with growing needs for high quality topographic data. 3DEP is a collection of enhanced elevation data in the form of high quality LiDAR data over the conterminous United States, Hawaii, there are three bare earth DEM layers in 3DEP which are nationally seamless at the resolution of 1/3,1, and 2 arcseconds. This map is derived from GTOPO30 data that describes the elevation of Earths terrain at intervals of 30 arcseconds and it uses color and shading instead of contour lines to indicate elevation. Hypsography is the study of the distribution of elevations on the surface of the Earth, the term originates from the Greek word ὕψος hypsos meaning height. Most often it is used only in reference to elevation of land, related to the term hypsometry, the measurement of these elevations of a planets solid surface are taken relative to mean datum, except for Earth which is taken relative to the sea level. In the troposphere, temperatures decrease with altitude and this lapse rate is approximately 6.5 °C/km. S
Elevation
–
A sign at 8000 feet (2438 meters) in the
San Bernardino Mountains.
Elevation
–
Elevation
histogram of the surface of the Earth – approximately 71% of the Earth's surface is covered with water.
Elevation
Elevation
–
Part of a
topographic map of
Haleakala (
Hawaii), showing elevation.
7.
Terrain
–
Terrain or relief is the vertical and horizontal dimension of the land surface. When relief is described underwater, the term bathymetry is used, the Latin Word Terra, is Earth. Terrain is used as a term in physical geography, referring to the lay of the land. This is usually expressed in terms of the elevation, slope, terrain affects surface water flow and distribution. Over a large area, it can affect weather and climate patterns, complex arrays of relief data are used as input parameters for hydrology transport models to allow prediction of river water quality. Understanding terrain also supports soil conservation, especially in agriculture, contour ploughing is an established practice enabling sustainable agriculture on sloping land, it is the practice of ploughing along lines of equal elevation instead of up and down a slope. Terrain is militarily critical because it determines the ability of armed forces to take and hold areas, an understanding of terrain is basic to both defensive and offensive strategy. Terrain is important in determining weather patterns, two areas geographically close to each other may differ radically in precipitation levels or timing because of elevation differences or a rain shadow effect. Precise knowledge of terrain is vital in aviation, especially for low-flying routes and maneuvers, terrain will also affect range and performance of radars and terrestrial radio navigation systems. Furthermore, a hilly or mountainous terrain can strongly impact the implementation of a new aerodrome, relief refers specifically to the quantitative measurement of vertical elevation change in a landscape. It is the difference between maximum and minimum elevations within an area, usually of limited extent. The relief of a landscape can change with the size of the area over which it is measured, making the definition of the scale over which it is measured very important. Because it is related to the slope of surfaces within the area of interest and to the gradient of any streams present, the relief of a landscape is a useful metric in the study of the Earths surface. Relief energy, which may be defined inter alia as the height range in a regular grid, is essentially an indication of the ruggedness or relative height of the terrain. Geomorphology is in part the study of the formation of terrain or topography. Terrain is formed by intersecting processes, Geological processes, Migration of tectonic plates, faulting and folding, volcanic eruptions, erosional processes, water and wind erosion, landslides. Tectonic processes such as orogenies cause land to be elevated, land surface parameters are quantitative measures of various morphometric properties of a surface. The most common examples are used to derive slope or aspect of a terrain or curvatures at each location and these measures can also be used to derive hydrological parameters that reflect flow/erosion processes
Terrain
–
A shaded and colored image (i.e. terrain is enhanced) of varied terrain from the
Shuttle Radar Topography Mission. This shows
elevation model of New Zealand's
Alpine Fault running about 500 km (300 mi) long. The
escarpment is flanked by a vast chain of hills between the
fault and the
mountains of
New Zealand 's
Southern Alps. Northeast is towards the top.
Terrain
–
Present-day
Earth altimetry and
bathymetry. Data from the
National Geophysical Data Center 's TerrainBase Digital Terrain Model.
8.
Altitude
–
Altitude or height is defined based on the context in which it is used. As a general definition, altitude is a measurement, usually in the vertical or up direction. The reference datum also often varies according to the context, although the term altitude is commonly used to mean the height above sea level of a location, in geography the term elevation is often preferred for this usage. Vertical distance measurements in the direction are commonly referred to as depth. In aviation, the altitude can have several meanings, and is always qualified by explicitly adding a modifier. Parties exchanging altitude information must be clear which definition is being used, aviation altitude is measured using either mean sea level or local ground level as the reference datum. When flying at a level, the altimeter is always set to standard pressure. On the flight deck, the instrument for measuring altitude is the pressure altimeter. There are several types of altitude, Indicated altitude is the reading on the altimeter when it is set to the local barometric pressure at mean sea level. In UK aviation radiotelephony usage, the distance of a level, a point or an object considered as a point, measured from mean sea level. Absolute altitude is the height of the aircraft above the terrain over which it is flying and it can be measured using a radar altimeter. Also referred to as radar height or feet/metres above ground level, true altitude is the actual elevation above mean sea level. It is indicated altitude corrected for temperature and pressure. Height is the elevation above a reference point, commonly the terrain elevation. Pressure altitude is used to indicate flight level which is the standard for reporting in the U. S. in Class A airspace. Pressure altitude and indicated altitude are the same when the setting is 29.92 Hg or 1013.25 millibars. Density altitude is the altitude corrected for non-ISA International Standard Atmosphere atmospheric conditions, aircraft performance depends on density altitude, which is affected by barometric pressure, humidity and temperature. On a very hot day, density altitude at an airport may be so high as to preclude takeoff and these types of altitude can be explained more simply as various ways of measuring the altitude, Indicated altitude – the altitude shown on the altimeter
Altitude
–
Vertical distance comparison
9.
Adiabatic cooling
–
In thermodynamics, an adiabatic process is one that occurs without transfer of heat or matter between a thermodynamic system and its surroundings. In an adiabatic process, energy is transferred only as work, the adiabatic process provides a rigorous conceptual basis for the theory used to expound the first law of thermodynamics, and as such it is a key concept in thermodynamics. The adiabatic flame temperature is the temperature that would be achieved by a if the process of combustion took place in the absence of heat loss to the surroundings. A process that does not involve the transfer of heat or matter into or out of a system, so that Q =0, is called an adiabatic process, the assumption that a process is adiabatic is a frequently made simplifying assumption. Even though the cylinders are not insulated and are quite conductive, the same can be said to be true for the expansion process of such a system. The assumption of adiabatic isolation of a system is a useful one, the behaviour of actual machines deviates from these idealizations, but the assumption of such perfect behaviour provide a useful first approximation of how the real world works. According to Laplace, when sound travels in a gas, there is no loss of heat in the medium and the propagation of sound is adiabatic. For this adiabatic process, the modulus of elasticity E = γP where γ is the ratio of specific heats at constant pressure and at constant volume, such a process is called an isentropic process and is said to be reversible. Fictively, if the process is reversed, the energy added as work can be recovered entirely as work done by the system, if the walls of a system are not adiabatic, and energy is transferred in as heat, entropy is transferred into the system with the heat. Such a process is neither adiabatic nor isentropic, having Q >0, naturally occurring adiabatic processes are irreversible. The transfer of energy as work into an isolated system can be imagined as being of two idealized extreme kinds. In one such kind, there is no entropy produced within the system, in nature, this ideal kind occurs only approximately, because it demands an infinitely slow process and no sources of dissipation. The other extreme kind of work is work, for which energy is added as work solely through friction or viscous dissipation within the system. The second law of thermodynamics observes that a process, of transfer of energy as work, always consists at least of isochoric work. Every natural process, adiabatic or not, is irreversible, with ΔS >0, the adiabatic compression of a gas causes a rise in temperature of the gas. Adiabatic expansion against pressure, or a spring, causes a drop in temperature, in contrast, free expansion is an isothermal process for an ideal gas. Adiabatic heating occurs when the pressure of a gas is increased from work done on it by its surroundings and this finds practical application in diesel engines which rely on the lack of quick heat dissipation during their compression stroke to elevate the fuel vapor temperature sufficiently to ignite it. Adiabatic heating occurs in the Earths atmosphere when an air mass descends, for example, in a wind, Foehn wind
Adiabatic cooling
–
For a simple substance, during an adiabatic process in which the volume increases, the
internal energy of the working substance must decrease
10.
Relative humidity
–
Relative humidity is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest and it requires less water vapor to attain high relative humidity at low temperatures, more water vapour is required to attain high relative humidity in warm or hot air. Humans are sensitive to high humidity because the body uses evaporative cooling, enabled by perspiration. Perspiration evaporates from the more slowly under humid conditions than under arid. For example, if the air temperature is 24 °C and the humidity is zero percent. If the relative humidity is 100 percent at the air temperature. In other words, if the air is 24 °C and contains saturated water vapor, then the human body cools itself at the rate as it would if it were 27 °C. The heat index and the humidex are indices that reflect the effect of temperature. In cold climates, the temperature causes lower capacity for water vapour to flow about. Dry cracked skin can result from dry air, low humidity causes tissue lining nasal passages to dry, crack and become more susceptible to penetration of Rhinovirus cold viruses. Low humidity is a cause of nosebleeds. The use of a humidifier in homes, especially bedrooms, can help with these symptoms, indoor relative humidities should be kept above 30% to reduce the likelihood of the occupants nasal passages drying out. Humans can be comfortable within a range of humidities depending on the temperature—from thirty to seventy percent—but ideally between 50% and 60%. Very low humidity can create discomfort, respiratory problems, and aggravate allergies in some individuals, in the winter, it is advisable to maintain relative humidity at 30 percent or above. Extremely low relative humidities may also cause eye irritation, wooden furniture can shrink, causing the paint that covers these surfaces to fracture. When the temperature is low and the humidity is high. When relative humidity approaches 100 percent, condensation can occur on surfaces, leading to problems with mold, corrosion, decay, condensation can pose a safety risk as it can promote the growth of mold and wood rot as well as possibly freezing emergency exits shut. The basic principles for buildings, above, also apply to vehicles, in addition, there may be safety considerations
Relative humidity
–
Humidity and hygrometry
11.
Cloud
–
The experiment began operation in November 2009. The primary goal is to understand the influence of cosmic rays on aerosols and clouds. Although its design is optimised to address the cosmic ray question, CLOUD allows as well to measure aerosol nucleation, atmospheric aerosols and their effect on clouds are recognised by the IPCC as main source of uncertainty in present radiative forcing and climate models. The core of the experiment is a steel chamber of 26m³ volume filled with synthetic air made from liquid nitrogen. The chamber atmosphere and pressure is being measured and regulated by various instrumentations, the aerosol chamber can be exposed to an adjustable particle beam simulating GCRs at various altitude or latitude. The chamber contains a field cage to control the drift of small ions. The ionisation produced by cosmic rays can be removed with an electric field. Besides, humidity and temperature inside the chamber can be regulated, CERN posted a 2009 progress report on the CLOUD project. J. Kirkby reviews developments in the CERN CLOUD project and planned tests and he describes cloud nucleation mechanisms which appear energetically favourable and depend on GCRs. On 24 August 2011, preliminary research published in the journal Nature showed there was a connection between Cosmic Rays and aerosol nucleation, the first CLOUD experiments showed that sulphuric acid as such has a much smaller effect than had been assumed. In 2014, CLOUD researchers presented newer experimental results showing an interaction between oxidised biogenic vapours and sulphuric acid and this new process may account for seasonal variations in atmospheric aerosol particles, which are being related to higher global tree emissions in the northern hemisphere summer. Besides biogenic vapours produced by plants, another class of trace vapours and these are found close to their primary sources, e. g. animal husbandry, while alpha-pinene is generally found over landmasses. The experiments show that sulfuric acid and oxidized organic vapors at low concentrations reproduce suitable particle nucleation rates, CLOUD insofar allows to explain a large fraction of cloud seeds in the lower atmosphere involving sulphuric acid and biogenic aerosols. This result does not support the hypothesis that cosmic rays significantly affect climate, dunne et al. have presented the main outcomes of 10 years of results obtained at the CLOUD experiment performed at CERN. They have studied in detail the physico-chemical mechanisms and the kinetics of aerosols formation
Cloud
12.
Precipitation (meteorology)
–
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation include drizzle, rain, sleet, snow, graupel, Precipitation occurs when a portion of the atmosphere becomes saturated with water vapor, so that the water condenses and precipitates. Thus, fog and mist are not precipitation but suspensions, because the vapor does not condense sufficiently to precipitate. Two processes, possibly acting together, can lead to air becoming saturated, Precipitation forms as smaller droplets coalesce via collision with other rain drops or ice crystals within a cloud. Short, intense periods of rain in scattered locations are called showers, moisture that is lifted or otherwise forced to rise over a layer of sub-freezing air at the surface may be condensed into clouds and rain. This process is active when freezing rain is occurring. A stationary front is often present near the area of freezing rain, provided necessary and sufficient atmospheric moisture content, the moisture within the rising air will condense into clouds, namely stratus and cumulonimbus. Eventually, the droplets will grow large enough to form raindrops. Lake-effect snowfall can be locally heavy, thundersnow is possible within a cyclones comma head and within lake effect precipitation bands. In mountainous areas, heavy precipitation is possible where upslope flow is maximized within windward sides of the terrain at elevation, on the leeward side of mountains, desert climates can exist due to the dry air caused by compressional heating. The movement of the trough, or intertropical convergence zone. Precipitation is a component of the water cycle, and is responsible for depositing the fresh water on the planet. Approximately 505,000 cubic kilometres of water falls as precipitation each year,398,000 cubic kilometres of it over the oceans and 107,000 cubic kilometres over land. Given the Earths surface area, that means the globally averaged annual precipitation is 990 millimetres, Climate classification systems such as the Köppen climate classification system use average annual rainfall to help differentiate between differing climate regimes. Precipitation may occur on celestial bodies, e. g. when it gets cold, Mars has precipitation which most likely takes the form of frost. Precipitation is a component of the water cycle, and is responsible for depositing most of the fresh water on the planet. Approximately 505,000 km3 of water falls as precipitation each year,398,000 km3 of it over the oceans, given the Earths surface area, that means the globally averaged annual precipitation is 990 millimetres. Mechanisms of producing precipitation include convective, stratiform, and orographic rainfall, Precipitation can be divided into three categories, based on whether it falls as liquid water, liquid water that freezes on contact with the surface, or ice
Precipitation (meteorology)
–
A thunderstorm with heavy precipitation
Precipitation (meteorology)
–
Long-term mean precipitation by month
Precipitation (meteorology)
–
Late-summer
rainstorm in
Denmark
Precipitation (meteorology)
–
Lenticular cloud forming due to mountains over Wyoming
13.
Rain shadow
–
A rain shadow is a dry area on the leeward side of a mountainous area. The mountains block the passage of rain-producing weather systems and cast a shadow of dryness behind them, wind and moist air is drawn by the prevailing winds towards the top of the mountains, where it condenses and precipitates before it crosses the top. The air, without much moisture left, advances behind the mountains creating a side called the rain shadow. The condition exists because warm moist air rises by orographic lifting to the top of a mountain range, as atmospheric pressure decreases with increasing altitude, the air has expanded and adiabatically cooled to the point that the air reaches its adiabatic dew point. At the adiabatic dew point, moisture condenses onto the mountain and it precipitates on the top, the air descends on the leeward side, but due to the precipitation it has lost much of its moisture. There are regular patterns of prevailing winds found in round the Earths equatorial region. The zone designated the trade winds is the zone between about 30° N and 30° S, blowing predominantly from the northeast in the Northern Hemisphere, the strongest westerly winds in the middle latitudes can come in the Roaring Forties between 30 and 50 degrees latitude. The Dasht-i-Lut in Iran is in the shadow of the Elburz. The Ordos Desert is rain shadowed by mountain chains including the Kara-naryn-ula, the Sheitenula, and the Yin Mountains, which link on to the south end of the Great Khingan Mountains. The Thar desert is bounded and rain shadowed by the Aravalli ranges to the south-east, the Himalaya to the northeast, Eastern Side of Sahyadri ranges on Deccan e. g. Northern Karnataka & Solapur, Beed, Osmanabad and Vidharba Plateau of India. The central region of Myanmar is in the shadow of the Arakan Mountains and is almost semi-arid with only 750 millimetres of rain as against as much as 5.5 metres on the Rakhine State coast. The High Peaks of Mount Lebanon rain-shadow the northern parts of the Beqaa Valley, the Judean Desert, the Dead Sea and the western slopes of the Moab Mountains on the opposite side are rain-shadowed by the Judean Hills. The Atacama Desert in Chile is the driest non-polar desert on Earth because it is blocked from moisture on both sides, Cuyo and Eastern Patagonia is rain shadowed from the prevailing westerly winds by the Andes range and is arid. The Argentinian wine region of Cuyo and Northern Patagonia is almost completely dependent on irrigation, on the largest scale, the entirety of the North American Interior Plains are shielded from the prevailing Westerlies carrying moist Pacific weather by the North American Cordillera. More pronounced effects are observed, however, in valley regions within the Cordillera. Most rainshadows in the western United States are due to the Sierra Nevada, champlain Valley in upstate New York. It is protected by the Adirondack Mountains, hawaii also has rain shadows, with some areas being desert. Orographic lifting produces the worlds second-highest annual precipitation record,12.7 meters, on the island of Kauai, the entire island of Kahoolawe lies in the rain shadow of Mauis East Maui Volcano
Rain shadow
–
An example of a rain shadow.
Rain shadow
–
The
Tibetan Plateau (top), perhaps the best example of a rain shadow. Rain does not make it past the
Himalayas, leading to an arid climate on the leeward side of the
mountain range.
Rain shadow
–
The
Agasthiyamalai hills cut off
Tirunelveli (
India) from the
monsoons, creating a rainshadow region
14.
Mogollon Rim
–
The Mogollon Rim or /mɒɡɒdʒɔːn/) is a topographical and geological feature cutting across the U. S. state of Arizona. It extends approximately 200 miles, starting in northern Yavapai County and running eastward and it forms the southern edge of the Colorado Plateau in Arizona. The Rim is an escarpment defining the southwestern edge of the Colorado Plateau and its central and most spectacular portions are characterized by high cliffs of limestone and sandstone, namely the Kaibab Limestone and Coconino Sandstone cliffs. The escarpment was created by erosion and faulting, cutting dramatic canyons into it, including Fossil Creek Canyon, the name Mogollon comes from Don Juan Ignacio Flores Mogollón, the Spanish Governor of New Mexico from 1712 to 1715. The Mogollon Rims limestones and sandstones were formed from sediments deposited in the Carboniferous, several of the Rims rock formations are also seen on the walls of the Grand Canyon. In many places, the Rim is capped or even buried by the basaltic lava flows. The uppermost sandstone stratum of the Mogollon Rim, called the Coconino Sandstone, forms spectacular white cliffs and this formation of the Permian Period is of aeolian origin and is one of the thickest sand-dune-derived sandstones on earth. Cities and towns near the Mogollon Rim include Payson, Sedona, Show Low, Alpine, the Mogollon Rim is practically bisected by Interstate 17 which runs north-to-south between Flagstaff and Phoenix. In June 2002, the portion of the Mogollon Rim was the site of Arizonas second-largest wildfire. The Mogollon Rim was also the site of the Dude fire that started on June 25,1990 and this fire grew to cover over 30,000 acres and killed six wildland firefighters. Other large fires have burned along the Mogollon Rim since 1990, and the ponderosa pine forests remain vulnerable because of past fire-suppression efforts. Western novel author Zane Grey built a cabin on the slopes of the Mogollon Rim just northeast of Payson. The cabin was restored by the Phoenix air-conditioning magnate William Goettl during the late 1960s, louis LAmours novel The Sackett Brand, set near the Mogollon Rim, includes descriptions of its cliffs. Hellsgate Wilderness Mogollon Monster Mogollon Mountains Pinyon-juniper woodland Mogollon Rim recreation, Coconino National Forest Land Use History of the Mogollon Rim, Arizona
Mogollon Rim
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View of Mogollon Rim, east of
Pine, Arizona
Mogollon Rim
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View from Mogollon Rim near
Payson, Arizona
Mogollon Rim
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Site of Zane Grey's lodge
15.
Sierra Nevada (U.S.)
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The Sierra Nevada is a mountain range in the Western United States, between the Central Valley of California and the Basin and Range Province. The vast majority of the lies in the state of California. The Sierra runs 400 miles north-to-south, and is approximately 70 miles across east-to-west, the Sierra is home to three national parks, twenty wilderness areas, and two national monuments. These areas include Yosemite, Sequoia, and Kings Canyon National Parks, the character of the range is shaped by its geology and ecology. More than one hundred years ago during the Nevadan orogeny. The range started to uplift four M. A. ago, the uplift caused a wide range of elevations and climates in the Sierra Nevada, which are reflected by the presence of five life zones. Uplift continues due to faulting caused by forces, creating spectacular fault block escarpments along the eastern edge of the southern Sierra. The Sierra Nevada has a significant history, the California Gold Rush occurred in the western foothills from 1848 through 1855. Due to inaccessibility, the range was not fully explored until 1912, the Sierra Nevada lies in Central and Eastern California, with a very small but historically important spur extending into Nevada. West-to-east, the Sierra Nevadas elevation increases gradually from 1,000 feet in the Central Valley to an height of about 10,500 feet at its crest only 50–75 miles to the east. The east slope forms the steep Sierra Escarpment, unlike its surroundings, the range receives a substantial amount of snowfall and precipitation due to orographic lift. The Sierra Nevada stretches from the Susan River and Fredonyer Pass in the north to Tehachapi Pass in the south and it is bounded on the west by Californias Central Valley and on the east by the Basin and Range Province. The geographical boundary between the Sierra and the Cascades is virtually indistinguishable, with the Fredonyer Pass designation being traditional, physiographically, the Sierra is a section of the Cascade-Sierra Mountains province, which in turn is part of the larger Pacific Mountain System physiographic division. The range is drained on its western slope by the Central Valley watershed, the northern third of the western Sierra is part of the Sacramento River watershed, and the middle third is drained by the San Joaquin River. The eastern slope watershed of the Sierra is much narrower, its rivers flow out into the endorheic Great Basin of eastern California and western Nevada. Although none of the eastern rivers reach the sea, many of the streams from Mono Lake southwards are diverted into the Los Angeles Aqueduct which provides water to Southern California, the height of the mountains in the Sierra Nevada increases gradually from north to south. Between Fredonyer Pass and Lake Tahoe, the range from 5,000 feet to more than 9,000 feet. The crest near Lake Tahoe is roughly 9,000 feet high, farther south, the highest peak in Yosemite National Park is Mount Lyell
Sierra Nevada (U.S.)
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The Sierra's
Mills Creek cirque (center) is on the west side of the
Sierra Crest, south of
Mono Lake (top, blue).
Sierra Nevada (U.S.)
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Mount Whitney, the highest peak in the range and the contiguous United States
Sierra Nevada (U.S.)
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The Sierra hosts many waterways, such as the
Tuolumne River.
Sierra Nevada (U.S.)
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Mount Tallac above
Lake Tahoe
16.
Mawsynram
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Mawsynram is a village in the East Khasi Hills district of Meghalaya state in north-eastern India,65 kilometres from Shillong. According to the Guinness Book of World Records, Mawsynram received 26,000 millimetres of rainfall in 1985. Mawsynram is located at 25° 18′ N, 91° 35′ E, at an altitude of about 1,400 metres,16 km west of Cherrapunji, in the Khasi Hills in the state of Meghalaya. The name of the village contains Maw, a Khasi word meaning stone, Khasi Hills are rich with such megaliths. Under the Köppen climate classification, Mawsynram features a subtropical climate with an extraordinarily showery and long monsoonal season. Based on the data of a recent few decades, it appears to be the wettest place in the world, Mawsynram receives nearly 10,000 millimeters of rain in an average year, and the vast majority of rain it falls during the monsoon months. A comparison of rainfalls for Cherrapunji and Mawsynram for some years is given in Table 1, primarily due to the high altitude, it seldom gets truly hot in Mawsynram. Average monthly temperatures range from around 11°C in January to just above 20°C in August, the village also experiences a brief but noticeably drier season from December until February, when monthly precipitation on average does not exceed 30 millimetres. The little precipitation during the village’s “low sun” season is something that is shared by many areas with this type of climate, Table 1, Comparison of rainfalls for Cherrapunji and Mawsynram from 1970. The alignment of the Khasi Hills places them directly in the path of the airflow from the Bay of Bengal, located in Mawsynram, is a cave named Mawjymbuin, known for its stalagmites. Inside this cave is a pair of notable speleothems - breast-shaped stalactite over a massive stalagmite, the area is known for its many caves, commercialised and non-commercialised, which contain remnants of a past that tells us of the history of the plateau that was once under water. The Tribune - The dispute between Mawsynram and Cherrapunji for the title of wettest place on earth
Mawsynram
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Nature made stalagmite Shivalinga in Mawjymbuin Cave, Mawsynram Meghalaya.
17.
Yemen
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Yemen, officially known as the Republic of Yemen, is an Arab country in Western Asia, occupying South Arabia, the southern end of the Arabian Peninsula. Yemen is the second-largest country in the peninsula, occupying 527,970 km2, the coastline stretches for about 2,000 km. It is bordered by Saudi Arabia to the north, the Red Sea to the west, the Gulf of Aden and Arabian Sea to the south, although Yemens constitutionally stated capital is the city of Sanaa, the city has been under rebel control since February 2015. Because of this, Yemens capital has been relocated to the port city of Aden. Yemens territory includes more than 200 islands, the largest of these is Socotra, Yemen was the home of the Sabaeans, a trading state that flourished for over a thousand years and probably also included parts of modern-day Ethiopia and Eritrea. In 275 AD, the region came under the rule of the later Jewish-influenced Himyarite Kingdom, Christianity arrived in the fourth century, whereas Judaism and local paganism were already established. Islam spread quickly in the century and Yemenite troops were crucial in the expansion of the early Islamic conquests. Administration of Yemen has long been notoriously difficult, several dynasties emerged from the ninth to 16th centuries, the Rasulid dynasty being the strongest and most prosperous. The country was divided between the Ottoman and British empires in the twentieth century. The Zaydi Mutawakkilite Kingdom of Yemen was established after World War I in North Yemen before the creation of the Yemen Arab Republic in 1962, South Yemen remained a British protectorate known as the Aden Protectorate until 1967 when it became an independent state and later, a Marxist state. The two Yemeni states united to form the modern republic of Yemen in 1990, Yemen is a developing country, and the poorest country in the Middle East. Under the rule of President Ali Abdullah Saleh, Yemen was described as a kleptocracy, according to the 2009 international corruption Perception Index by Transparency International, Yemen ranked 164 out of 182 countries surveyed. President Saleh stepped down and the powers of the presidency were transferred to Vice President Abd Rabbuh Mansur Hadi, the transitional process was disrupted by conflicts between the Houthis and al-Islah, as well as the al-Qaeda insurgency. In September 2014, the Houthis took over Sanaa, later declaring themselves in control of the government in a coup détat, since then, a Saudi-led intervention has taken place, however, it could not stop the civil war. Instead, the Saudis and the others have destroyed some hospitals, schools and homes, Yemen was mentioned in Old South Arabian inscriptions as Yamnat. In Arabic literature, the term includes much greater territory than that of the republic of Yemen. It stretches from the northern Asir Region in southwestern Saudi Arabia to Dhofar Governorate in southern Oman, one etymology derives Yemen from yumn, meaning felicity, as much of the country is fertile. The Romans called it Arabia Felix, as opposed to Arabia Deserta, al-Yaman significantly plays on the notion of the land to the right, when in Mecca facing the dawn, complementary to Al-Sham, the Land to the Left, referring to the Levant
Yemen
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Sabaean gravestone of a woman holding a stylized sheaf of wheat, a symbol of fertility in ancient Yemen
Yemen
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Flag
Yemen
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A funerary
stela featuring a musical scene, 1st century AD
Yemen
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Himyarite King Dhamar Ali Yahbur II
18.
Western Ghats
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Western Ghats மேற்கு தொடர்ச்சி மலை is a mountain range that runs parallel to the western coast of the Indian peninsula, located entirely in India. It is a UNESCO World Heritage Site and is one of the eight hottest hot-spots of biological diversity in the world and it is sometimes called the Great Escarpment of India. The range runs north to south along the edge of the Deccan Plateau. These hills cover 160,000 km2 and form the catchment area for complex riverine drainage systems that drain almost 40% of India, the Western Ghats block southwest monsoon winds from reaching the Deccan Plateau. The average elevation is around 1,200 m, at least 325 globally threatened species occur in the Western Ghats. The Western Ghats are the mountainous faulted and eroded edge of the Deccan Plateau, geologic evidence indicates that they were formed during the break-up of the supercontinent of Gondwana some 150 million years ago. Geophysical evidence indicates that the west coast of India came into being somewhere around 100 to 80 mya after it broke away from Madagascar, after the break-up, the western coast of India would have appeared as an abrupt cliff some 1,000 m in elevation. Basalt is the predominant rock found in the reaching a thickness of 3 km. Other rock types found are charnockites, granite gneiss, khondalites, leptynites, metamorphic gneisses with detached occurrences of limestone, iron ore. Residual laterite and bauxite ores are found in the southern hills. The Western Ghats extend from the Satpura Range in the north and it traverses south past the states of Maharashtra, Goa, Karnataka and Kerala. Major gaps in the range are the Goa Gap, between the Maharashtra and Karnataka sections, and the Palghat Gap on the Tamil Nadu and Kerala border between the Nilgiri Hills and the Anaimalai Hills. The mountains intercept the rain-bearing westerly monsoon winds, and are consequently an area of high rainfall, particularly on their western side. The northern portion of the coastal plain between the Western Ghats and the Arabian Sea is known as the Konkan, the central portion is called Kanara. The foothill region east of the Ghats in Maharashtra is known as Desh, the range is known as Sahyadri in Maharashtra and Karnataka. The Western Ghats meets the Eastern Ghats at Nilgiris in northwestern Tamil Nadu, Nilgiris connects Biligiriranga Hills in southeastern Karnataka with the Shevaroys and Tirumala hills. In the southern part of the range is Anamudi, the highest peak in Western Ghats, following is a list of some of the highest peaks of the Western Ghats, The Western Ghats form one of the four watersheds of India, feeding the perennial rivers of India. The major river systems originating in the Western Ghats include Godavari, Kaveri, Krishna, Thamiraparani, majority of streams draining the Western Ghats join these rivers and carry large volume of water during the monsoon months
Western Ghats
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A view of
Anamudi, the highest peak of the Western Ghats 2,695 metres (8,842 ft) from
Eravikulam National Park, Kerala.
Western Ghats
Western Ghats
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The Dense Vegetation in the Watchumaram Region towards valparai
Western Ghats
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Shola Grasslands and forests in the
Kudremukh National Park, Western Ghats,
Karnataka.
19.
Great Dividing Range
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The Great Dividing Range, or the Eastern Highlands, is Australias most substantial mountain range and the third longest land-based range in the world. The width of the range varies from about 160 km to over 300 km, the Dividing Range does not consist of a single mountain range. It consists of a complex of ranges, plateaus, upland areas and escarpments with an ancient. The physiographic division name for the landmass is called the East Australian Cordillera, in some places the terrain is relatively flat, consisting of very low hills. Typically the highlands range from 300 m to 1,600 m in height, the mountains and plateaus, which consist of limestones, sandstone, quartzite, schists and dolomite, have been created by faulting and folding processes. In the north, the rivers on the west side of the drain towards the Gulf of Carpentaria. The higher and more rugged parts of the range do not necessarily part of the crest of the range. At some places it can be up to 400 km wide, notable ranges and other features which form part of the range complex have their own distinctive names. The Great Dividing Range was formed during the Carboniferous period—over 300 million years ago—when Australia collided with what is now parts of South America, the range has experienced significant erosion since. For tens of thousands of years prior to British colonisation the ranges were home to various Aboriginal Australian nations and clans, evidence remains in some places of their traditional way of life including decorated caves, campsites and trails used to travel between the coastal and inland regions. Many descendants of these still exist today and remain the traditional owners. After British colonisation in 1788, the ranges were an obstacle to exploration, although not high, parts of the highlands were very rugged. Towns in the Blue Mountains were later named each of these men. This was the start of the development of the districts of inland New South Wales. A road was built to Blaxland by convicts within six months, easier routes to inland New South Wales were discovered towards Goulburn to the southwest, and westwards from Newcastle. Subsequent explorations were made across and around the ranges by Allan Cunningham, John Oxley, Hamilton Hume, Paul Edmund Strzelecki, Ludwig Leichhardt and these explorers were mainly concerned with finding and appropriating good agricultural land. By the late 1830s the most fertile rangelands adjacent to the ranges had been explored, appropriated from the traditional inhabitants. These included the Gippsland and Riverina regions in the south, up to the Liverpool Plains, various road and railway routes were subsequently established through many parts of the ranges, although many areas remain remote to this day
Great Dividing Range
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Great Dividing Range
Great Dividing Range
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The Great Divide dominates the eastern Australia landmass
Great Dividing Range
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Great Dividing Range sign on the
Kings Highway between
Braidwood and
Bungendore, New South Wales
Great Dividing Range
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The Snowy Mountains alpine region
20.
New Zealand
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New Zealand /njuːˈziːlənd/ is an island nation in the southwestern Pacific Ocean. The country geographically comprises two main landmasses—the North Island, or Te Ika-a-Māui, and the South Island, or Te Waipounamu—and around 600 smaller islands. New Zealand is situated some 1,500 kilometres east of Australia across the Tasman Sea and roughly 1,000 kilometres south of the Pacific island areas of New Caledonia, Fiji, because of its remoteness, it was one of the last lands to be settled by humans. During its long period of isolation, New Zealand developed a distinct biodiversity of animal, fungal, the countrys varied topography and its sharp mountain peaks, such as the Southern Alps, owe much to the tectonic uplift of land and volcanic eruptions. New Zealands capital city is Wellington, while its most populous city is Auckland, sometime between 1250 and 1300 CE, Polynesians settled in the islands that later were named New Zealand and developed a distinctive Māori culture. In 1642, Dutch explorer Abel Tasman became the first European to sight New Zealand, in 1840, representatives of Britain and Māori chiefs signed the Treaty of Waitangi, which declared British sovereignty over the islands. In 1841, New Zealand became a colony within the British Empire, today, the majority of New Zealands population of 4.7 million is of European descent, the indigenous Māori are the largest minority, followed by Asians and Pacific Islanders. Reflecting this, New Zealands culture is derived from Māori and early British settlers. The official languages are English, Māori and New Zealand Sign Language, New Zealand is a developed country and ranks highly in international comparisons of national performance, such as health, education, economic freedom and quality of life. Since the 1980s, New Zealand has transformed from an agrarian, Queen Elizabeth II is the countrys head of state and is represented by a governor-general. In addition, New Zealand is organised into 11 regional councils and 67 territorial authorities for local government purposes, the Realm of New Zealand also includes Tokelau, the Cook Islands and Niue, and the Ross Dependency, which is New Zealands territorial claim in Antarctica. New Zealand is a member of the United Nations, Commonwealth of Nations, ANZUS, Organisation for Economic Co-operation and Development, Pacific Islands Forum, and Asia-Pacific Economic Cooperation. Dutch explorer Abel Tasman sighted New Zealand in 1642 and called it Staten Landt, in 1645, Dutch cartographers renamed the land Nova Zeelandia after the Dutch province of Zeeland. British explorer James Cook subsequently anglicised the name to New Zealand, Aotearoa is the current Māori name for New Zealand. It is unknown whether Māori had a name for the country before the arrival of Europeans. Māori had several names for the two main islands, including Te Ika-a-Māui for the North Island and Te Waipounamu or Te Waka o Aoraki for the South Island. Early European maps labelled the islands North, Middle and South, in 1830, maps began to use North and South to distinguish the two largest islands and by 1907, this was the accepted norm. The New Zealand Geographic Board discovered in 2009 that the names of the North Island and South Island had never been formalised and this set the names as North Island or Te Ika-a-Māui, and South Island or Te Waipounamu
New Zealand
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The Waitangi sheet from the
Treaty of Waitangi
New Zealand
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Flag
New Zealand
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Painting of
Mount Earnslaw by John Turnbull Thomson, oil on canvas, 1888
New Zealand
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John Key,
Prime Minister of New Zealand since 2008
21.
Westerlies
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The westerlies, anti-trades, or prevailing westerlies, are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude. They originate from the areas in the horse latitudes and tend towards the poles. Tropical cyclones which cross the ridge axis into the westerlies recurve due to the increased westerly flow. The winds are predominantly from the southwest in the Northern Hemisphere, the strongest westerly winds in the middle latitudes can come in the roaring forties, between 40 and 50 degrees latitude. The westerlies play an important role in carrying the warm, equatorial waters and winds to the coasts of continents. If the Earth were a planet, solar heating would cause winds across the mid-latitudes to blow in a poleward direction. This is why winds across the Northern Hemisphere tend to blow from the southwest, when pressures are lower over the poles, the strength of the westerlies increases, which has the effect of warming the mid-latitudes. This occurs when the Arctic oscillation is positive, and during low pressure near the poles is stronger than it would be during the summer. When it is negative and pressures are higher over the poles, the flow is more meridional, blowing from the direction of the pole towards the equator, throughout the year, the westerlies vary in strength with the polar cyclone. As the cyclone reaches its maximum intensity in winter, the increase in strength. As the cyclone reaches its weakest intensity in summer, the Westerlies weaken, an example of the impact of the westerlies is when dust plumes, originating in the Gobi desert combine with pollutants and spread large distances downwind, or eastward, into North America. The westerlies can be strong, especially in the Southern Hemisphere. The currents in the Northern Hemisphere are weaker than those in the Southern Hemisphere due to the differences in strength between the westerlies of each hemisphere. The process of western intensification causes currents on the boundary of an ocean basin to be stronger than those on the eastern boundary of an ocean. These western ocean currents transport warm, tropical water polewards toward the polar regions, ships crossing both oceans have taken advantage of the ocean currents for centuries. The Antarctic Circumpolar Current, or the West Wind Drift, is a current that flows from west to east around Antarctica. The ACC is the dominant circulation feature of the Southern Ocean and, at approximately 125 Sverdrups, the largest ocean current. The Kuroshio is a western boundary current in the western north Pacific Ocean, similar to the Gulf Stream
Westerlies
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Benjamin Franklin's map of the Gulf Stream
22.
Tasman Sea
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The Tasman Sea is a marginal sea of the South Pacific Ocean, situated between Australia and New Zealand. It measures about 2,000 kilometres across and about 2,800 kilometres from north to south, the sea was named after the Dutch explorer Abel Janszoon Tasman, who was the first recorded European to encounter New Zealand and Tasmania. The British explorer Captain James Cook later extensively navigated the Tasman Sea in the 1770s as part of his first voyage of exploration. The Tasman Sea is informally referred to in both Australian and New Zealand English as The Ditch, for example, crossing the Ditch means travelling to Australia from New Zealand, or vice versa. The diminutive term The Ditch used for the Tasman Sea is comparable to referring to the North Atlantic Ocean as The Pond, the International Hydrographic Organization defines the limits of the Tasman Sea as follows, On the West. From the South East Rock to the North point of Three Kings Islands thence to North Cape in New Zealand, a line joining the South extreme of the foul ground off Cape Palliser and the Lighthouse on Cape Campbell. A line joining the Light on Waipapapa Point with East Head of Stewart Island, a line running from South West Cape, Stewart Island, through The Snares to North West Cape, Auckland Island, through this island to its Southern point. A line joining the Southern point of Auckland Island to South East Cape, the Tasman Seas mid-ocean ridge developed between 85 and 55 million years ago as Australia and Zealandia broke apart during the breakup of supercontinent Gondwana. It lies roughly midway between the continental margins of Australia and Zealandia, much of Zealandia is submerged, so the ridge runs much closer to the Australian coast than New Zealands. The first successful flight over the sea was accomplished by Charles Kingsford Smith later that year, the first person to row solo across the sea was Colin Quincey in 1977. The next successful crossing was completed by his son, Shaun Quincey in 2010. Axis naval activity in New Zealand waters Crossing the Ditch List of seas Media related to Tasman Sea at Wikimedia Commons
Tasman Sea
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Map of the Tasman Sea
Tasman Sea
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Location
Tasman Sea
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Smoke from the
Black Saturday bushfires crosses the southern Tasman Sea
23.
Tasmania
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Tasmania is an island state of the Commonwealth of Australia. It is located 240 km to the south of the Australian mainland, the state encompasses the main island of Tasmania, the 26th-largest island in the world, and the surrounding 334 islands. The state has a population of around 519,100, just over forty percent of which resides in the Greater Hobart precinct, Tasmanias area is 68,401 km2, of which the main island covers 64,519 km2. Though an island state, due to an error the state shares a land border with Victoria at its northernmost terrestrial point, Boundary Islet. The Bishop and Clerk Islets, about 37 km south of Macquarie Island, are the southernmost terrestrial point of the state of Tasmania, the island is believed to have been occupied by Aboriginals for 40,000 years before British colonisation. It is thought Tasmanian Aboriginals were separated from the mainland Aboriginal groups about 10,000 years ago when the sea rose to form Bass Strait. The conflict, which peaked between 1825 and 1831 and led to more than three years of law, cost the lives of almost 1100 Aboriginals and settlers. The near-destruction of Tasmanias Aboriginal population has been described by historians as an act of genocide by the British. The island was part of the Colony of New South Wales. In 1854 the present Constitution of Tasmania was passed and the year the state received permission to change its name to Tasmania. In 1901 it became a state through the process of the Federation of Australia, the state is named after Dutch explorer Abel Tasman, who made the first reported European sighting of the island on 24 November 1642. Tasman named the island Anthony van Diemens Land after his sponsor Anthony van Diemen, the name was later shortened to Van Diemens Land by the British. It was officially renamed Tasmania in honour of its first European discoverer on 1 January 1856, Tasmania was sometimes referred to as Dervon, as mentioned in the Jerilderie Letter written by the notorious Australian bushranger Ned Kelly in 1879. The colloquial expression for the state is Tassie, Tasmania is also colloquially shortened to Tas, especially when used in business names and website addresses. TAS is also the Australia Post abbreviation for the state, the reconstructed Palawa kani language name for Tasmania is Lutriwita. The island was adjoined to the mainland of Australia until the end of the last glacial period about 10,000 years ago, much of the island is composed of Jurassic dolerite intrusions through other rock types, sometimes forming large columnar joints. Tasmania has the worlds largest areas of dolerite, with many distinctive mountains, the central plateau and the southeast portions of the island are mostly dolerite. Mount Wellington above Hobart is an example, showing distinct columns known as the Organ Pipes
Tasmania
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Tasmania from space
Tasmania
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Flag
Tasmania
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Tessellated pavement, a rare rock formation on the
Tasman Peninsula
Tasmania
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Autumn on the
Derwent River in Tasmania
24.
Andes
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The Andes or Andean Mountains are the longest continental mountain range in the world. They are a range of highlands along the western edge of South America. This range is about 7,000 km long, about 200 to 700 km wide, the Andes extend from north to south through seven South American countries, Venezuela, Colombia, Ecuador, Peru, Bolivia, Argentina and Chile. Along their length, the Andes are split into several ranges, the Andes are the location of several high plateaus – some of which host major cities, such as Quito, Bogotá, Arequipa, Medellín, Sucre, Mérida and La Paz. The Altiplano plateau is the worlds second-highest after the Tibetan plateau and these ranges are in turn grouped into three major divisions based on climate, the Tropical Andes, the Dry Andes, and the Wet Andes. The Andes are the worlds highest mountain range outside of Asia, the highest mountain outside Asia, Mount Aconcagua, rises to an elevation of about 6,961 m above sea level. The peak of Chimborazo in the Ecuadorean Andes is farther from the Earths center than any other location on the Earths surface, the worlds highest volcanoes are in the Andes, including Ojos del Salado on the Chile-Argentina border, which rises to 6,893 m. The etymology of the word Andes has been debated, the majority consensus is that it derives from the Quechua word anti, which means east as in Antisuyu, one of the four regions of the Inca Empire. In the northern part of the Andes, the isolated Sierra Nevada de Santa Marta range is considered to be part of the Andes. The term cordillera comes from the Spanish word cordel, meaning rope, the Andes range is about 200 km wide throughout its length, except in the Bolivian flexure where it is about 640 kilometres wide. The Andes are the result of plate tectonics processes, caused by the subduction of oceanic crust beneath the South American plate. The main cause of the rise of the Andes is the compression of the rim of the South American Plate due to the subduction of the Nazca Plate. In the south, the Andes share a boundary with the former Patagonia Terrane. To the west, the Andes end at the Pacific Ocean, from a geographical approach, the Andes are considered to have their western boundaries marked by the appearance of coastal lowlands and a less rugged topography. The Andes Mountains also contain large quantities of iron ore located in mountains within the range. The Andean orogen has a series of bends or oroclines, the Bolivian Orocline is a seaward concave bending in the coast of South America and the Andes Mountains at about 18° S. At this point the orientation of the Andes turns from Northwest in Peru to South in Chile, the Andean segment north and south of the orocline have been rotated 15° to 20° counter clockwise and clockwise respectively. The Bolivian Orocline area overlaps with the area of maximum width of the Altiplano Plateau, the specific point at 18° S where the coastline bends is known as the Arica Elbow
Andes
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Aerial photo of a portion of the Andes between
Argentina and
Chile
Andes
Andes
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"
Cono de Arita " in the
Puna de Atacama,
Salta (
Argentina).
Andes
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Aerial view of Aconcagua.
25.
Pacific Ocean
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The Pacific Ocean is the largest and deepest of the Earths oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia in the west, the Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10,911 metres. Both the center of the Water Hemisphere and the Western Hemisphere are in the Pacific Ocean, the oceans current name was coined by Portuguese explorer Ferdinand Magellan during the Spanish circumnavigation of the world in 1521, as he encountered favourable winds on reaching the ocean. He called it Mar Pacífico, which in both Portuguese and Spanish means peaceful sea, important human migrations occurred in the Pacific in prehistoric times. Long-distance trade developed all along the coast from Mozambique to Japan, trade, and therefore knowledge, extended to the Indonesian islands but apparently not Australia. By at least 878 when there was a significant Islamic settlement in Canton much of trade was controlled by Arabs or Muslims. In 219 BC Xu Fu sailed out into the Pacific searching for the elixir of immortality, from 1404 to 1433 Zheng He led expeditions into the Indian Ocean. The east side of the ocean was discovered by Spanish explorer Vasco Núñez de Balboa in 1513 after his expedition crossed the Isthmus of Panama and he named it Mar del Sur because the ocean was to the south of the coast of the isthmus where he first observed the Pacific. Later, Portuguese explorer Ferdinand Magellan sailed the Pacific East to West on a Castilian expedition of world circumnavigation starting in 1519, Magellan called the ocean Pacífico because, after sailing through the stormy seas off Cape Horn, the expedition found calm waters. The ocean was often called the Sea of Magellan in his honor until the eighteenth century, sailing around and east of the Moluccas, between 1525 and 1527, Portuguese expeditions discovered the Caroline Islands, the Aru Islands, and Papua New Guinea. In 1542–43 the Portuguese also reached Japan, in 1564, five Spanish ships consisting of 379 explorers crossed the ocean from Mexico led by Miguel López de Legazpi and sailed to the Philippines and Mariana Islands. The Manila galleons operated for two and a half centuries linking Manila and Acapulco, in one of the longest trade routes in history, Spanish expeditions also discovered Tuvalu, the Marquesas, the Cook Islands, the Solomon Islands, and the Admiralty Islands in the South Pacific. In the 16th and 17th century Spain considered the Pacific Ocean a Mare clausum—a sea closed to other naval powers, as the only known entrance from the Atlantic the Strait of Magellan was at times patrolled by fleets sent to prevent entrance of non-Spanish ships. On the western end of the Pacific Ocean the Dutch threatened the Spanish Philippines, Spain also sent expeditions to the Pacific Northwest reaching Vancouver Island in southern Canada, and Alaska. The French explored and settled Polynesia, and the British made three voyages with James Cook to the South Pacific and Australia, Hawaii, and the North American Pacific Northwest, one of the earliest voyages of scientific exploration was organized by Spain in the Malaspina Expedition of 1789–1794. It sailed vast areas of the Pacific, from Cape Horn to Alaska, Guam and the Philippines, New Zealand, Australia, and the South Pacific. Growing imperialism during the 19th century resulted in the occupation of much of Oceania by other European powers, and later, Japan, in Oceania, France got a leading position as imperial power after making Tahiti and New Caledonia protectorates in 1842 and 1853 respectively. After navy visits to Easter Island in 1875 and 1887, Chilean navy officer Policarpo Toro managed to negotiate an incorporation of the island into Chile with native Rapanui in 1888, by occupying Easter Island, Chile joined the imperial nations
Pacific Ocean
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Maris Pacifici by
Ortelius (1589). One of the first printed maps to show the Pacific Ocean; see also
Waldseemüller map (1507).
Pacific Ocean
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The Pacific Ocean
Pacific Ocean
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USS
Lexington under air attack on 8 May 1942 during the
Battle of the Coral Sea
Pacific Ocean
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Map of the Pacific Ocean during European Exploration, circa 1702–1707.
26.
Northwestern United States
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The Northwestern United States is an informal geographic region of the United States. The region consistently includes the states of Oregon, Washington, and Idaho—and usually Montana, some sources include southeast Alaska in the Northwest. The related but distinct term Pacific Northwest generally excludes areas from the Rockies eastward, the Northwestern United States is a subportion of the Western United States. In contrast, states included in the regions and Utah are not simultaneously considered part of both regions. Like the southwestern United States, the Northwest definition has moved westward over time, the current area includes the old Oregon Territory. The region is similar to Federal Region X, which comprises Oregon, Washington, Idaho and it is home to over 14.2 million citizens. As the US westward expansion, the western border also shifted westward. In the early years of the United States, newly colonized lands lying immediately west of the Allegheny Mountains were detached from Virginia, during the decades that followed, the Northwest Territory covered much of the Great Lakes region east of the Mississippi River. Together, these states have a population of 14,273,965. The largest cities and metropolitan areas in the Northwest are, Lavender, land of Giants, The Drive to the Pacific Northwest, 1750-1950 online Schwantes, Carlos. The Pacific Northwest, An Interpretive History online Warren, Sidney, farthest Frontier, The Pacific Northwest online Winther, Oscar Osburn
Northwestern United States
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Seattle, the largest metropolitan area in the Northwest
Northwestern United States
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The dark red states are almost always included, while the striped states are usually considered part of the Northwestern United States as well.
Northwestern United States
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Portland, the second largest metropolitan area in the Northwest
Northwestern United States
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Boise, the third largest metropolitan area in the Northwest
27.
Washington (state)
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It was admitted to the Union as the 42nd state in 1889. Washington is sometimes referred to as Washington State or the State of Washington to distinguish it from Washington, Washington is the 18th largest state with an area of 71,362 square miles, and the 13th most populous state with over 7 million people. Washington is the second most populous state on the West Coast and in the Western United States, Mount Rainier, an active stratovolcano, is the states highest elevation at almost 14,411 feet and is the most topographically prominent mountain in the contiguous United States. Washington is a leading lumber producer and its rugged surface is rich in stands of Douglas fir, hemlock, ponderosa pine, white pine, spruce, larch, and cedar. Manufacturing industries in Washington include aircraft and missiles, shipbuilding and other equipment, lumber, food processing, metals and metal products, chemicals. Washington has over 1,000 dams, including the Grand Coulee Dam, built for a variety of purposes including irrigation, power, flood control, Washington was named after President George Washington by an act of the United States Congress during the creation of Washington Territory in 1853. Washington is the only U. S. state named after a president, confusion over the state of Washington and the city of Washington, D. C. led to renaming proposals during the statehood process for Washington in 1889, which failed to garner support. Washington, D. C. s own statehood movement in the 21st century includes a proposal to use the name State of Washington, Douglass Commonwealth, which would conflict with the current state of Washington. To distinguish it from the capital, Washington is sometimes referred to as Washington state, or, in more formal contexts. Residents of Washington and the Pacific Northwest simply refer to the state as Washington, Washington is the northwestern-most state of the contiguous United States. Washington is bordered by Oregon to the south, with the Columbia River forming the western part, to the west of Washington lies the Pacific Ocean. The high mountains of the Cascade Range run north-south, bisecting the state, from the Cascade Mountains westward, Western Washington has a mostly marine west coast climate, with mild temperatures and wet winters, autumns and springs, and relatively dry summers. The Cascade Range contains several volcanoes, which reach altitudes significantly higher than the rest of the mountains, from the north to the south, these major volcanoes are Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams. Mount Rainier, the tallest mountain in the state, is 50 miles south of the city of Seattle and it is also covered with more glacial ice than any other peak in the contiguous 48 states. Western Washington also is home of the Olympic Mountains, far west on the Olympic Peninsula and these deep forests, such as the Hoh Rainforest, are among the only temperate rainforests in the continental United States. Eastern Washington – the part of the state east of the Cascades – has a dry climate. It includes large areas of steppe and a few truly arid deserts lying in the rain shadow of the Cascades. Farther east, the climate becomes less arid, with annual rainfall increasing as one goes east to 21.2 inches in Pullman, the Okanogan Highlands and the rugged Kettle River Range and Selkirk Mountains cover much of the northeastern quadrant of the state
Washington (state)
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South Eastern Washington
Washington (state)
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Flag
Washington (state)
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The Pacific Coast of
Westport, Washington
Washington (state)
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Cascade Pass in the
North Cascades National Park
28.
British Columbia
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British Columbia is the westernmost province of Canada, with a population of more than four million people located between the Pacific Ocean and the Rocky Mountains. British Columbia is also a component of the Pacific Northwest and the Cascadia bioregion, along with the U. S. states of Idaho, Oregon, Washington and Alaska. The first British settlement in the area was Fort Victoria, established in 1843, subsequently, on the mainland, the Colony of British Columbia was founded by Richard Clement Moody and the Royal Engineers, Columbia Detachment, in response to the Fraser Canyon Gold Rush. Port Moody is named after him, in 1866, Vancouver Island became part of the colony of British Columbia, and Victoria became the united colonys capital. In 1871, British Columbia became the province of Canada. Its Latin motto is Splendor sine occasu, the capital of British Columbia remains Victoria, the fifteenth-largest metropolitan region in Canada, named for the Queen who created the original European colonies. The largest city is Vancouver, the third-largest metropolitan area in Canada, the largest in Western Canada, in October 2013, British Columbia had an estimated population of 4,606,371. British Columbia evolved from British possessions that were established in what is now British Columbia by 1871, First Nations, the original inhabitants of the land, have a history of at least 10,000 years in the area. Today there are few treaties and the question of Aboriginal Title, notably, the Tsilhqotin Nation has established Aboriginal title to a portion of their territory, as a result of the recent Supreme Court of Canada decision. BCs economy is diverse, with service producing industries accounting for the largest portion of the provinces GDP and it is the endpoint of transcontinental railways, and the site of major Pacific ports that enable international trade. Though less than 5% of its vast 944,735 km2 land is arable and its climate encourages outdoor recreation and tourism, though its economic mainstay has long been resource extraction, principally logging, farming, and mining. Vancouver, the provinces largest city and metropolitan area, also serves as the headquarters of many western-based natural resource companies and it also benefits from a strong housing market and a per capita income well above the national average. The Northern Interior region has a climate with very cold winters. The climate of Vancouver is by far the mildest winter climate of the major Canadian cities, the provinces name was chosen by Queen Victoria, when the Colony of British Columbia, i. e. the Mainland, became a British colony in 1858. The current southern border of British Columbia was established by the 1846 Oregon Treaty, British Columbias land area is 944,735 square kilometres. British Columbias rugged coastline stretches for more than 27,000 kilometres and it is the only province in Canada that borders the Pacific Ocean. British Columbias capital is Victoria, located at the tip of Vancouver Island. Only a narrow strip of the Island, from Campbell River to Victoria, is significantly populated, much of the western part of Vancouver Island and the rest of the coast is covered by thick, tall and sometimes impenetrable temperate rainforest
British Columbia
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Strait of Georgia, near
Vancouver.
British Columbia
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Flag
British Columbia
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The Okanagan region has a climate suitable to vineyards.
British Columbia
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Mount Robson,
Canadian Rockies, BC
29.
Alaska
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Alaska is a U. S. state located in the northwest extremity of North America. To the north are the Chukchi and Beaufort seas–the southern parts of the Arctic Ocean, the Pacific Ocean lies to the south and southwest. Alaska is the largest state in the United States by area, the 3rd least populous, approximately half of Alaskas residents live within the Anchorage metropolitan area. Alaskas economy is dominated by the fishing, natural gas, military bases and tourism are also a significant part of the economy. The United States purchased Alaska from the Russian Empire on March 30,1867, the area went through several administrative changes before becoming organized as a territory on May 11,1912. It was admitted as the 49th state of the U. S. on January 3,1959, the name Alaska was introduced in the Russian colonial period when it was used to refer to the peninsula. It was derived from an Aleut, or Unangam idiom, which refers to the mainland of Alaska. Literally, it means object to which the action of the sea is directed, Alaska is the northernmost and westernmost state in the United States and has the most easterly longitude in the United States because the Aleutian Islands extend into the Eastern Hemisphere. Alaska is the only non-contiguous U. S. state on continental North America and it is technically part of the continental U. S. but is sometimes not included in colloquial use, Alaska is not part of the contiguous U. S. often called the Lower 48. The capital city, Juneau, is situated on the mainland of the North American continent but is not connected by road to the rest of the North American highway system. Alaskas territorial waters touch Russias territorial waters in the Bering Strait, as the Russian Big Diomede Island, Alaska has a longer coastline than all the other U. S. states combined. Alaska is the largest state in the United States by total area at 663,268 square miles, over twice the size of Texas, Alaska is larger than all but 18 sovereign countries. Counting territorial waters, Alaska is larger than the area of the next three largest states, Texas, California, and Montana. It is also larger than the area of the 22 smallest U. S. states. Also referred to as the Panhandle or Inside Passage, this is the region of Alaska closest to the rest of the United States, as such, this was where most of the initial non-indigenous settlement occurred in the years following the Alaska Purchase. The region is dominated by the Alexander Archipelago as well as the Tongass National Forest and it contains the state capital Juneau, the former capital Sitka, and Ketchikan, at one time Alaskas largest city. The Alaska Marine Highway provides a vital transportation link throughout the area. The Interior is the largest region of Alaska, much of it is uninhabited wilderness, Fairbanks is the only large city in the region
Alaska
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Denali is the highest peak in North America.
Alaska
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Flag
Alaska
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Grizzly bear fishing for
salmon at
Brooks Falls, part of
Katmai National Park and Preserve.
Alaska
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Augustine Volcano erupting on January 12, 2006
30.
Mountain
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A mountain is a large landform that stretches above the surrounding land in a limited area, usually in the form of a peak. A mountain is steeper than a hill. Mountains are formed through tectonic forces or volcanism and these forces can locally raise the surface of the earth. Mountains erode slowly through the action of rivers, weather conditions, a few mountains are isolated summits, but most occur in huge mountain ranges. High elevations on mountains produce colder climates than at sea level and these colder climates strongly affect the ecosystems of mountains, different elevations have different plants and animals. Because of the less hospitable terrain and climate, mountains tend to be used less for agriculture and more for resource extraction and recreation, the highest mountain on Earth is Mount Everest in the Himalayas of Asia, whose summit is 8,850 m above mean sea level. The highest known mountain on any planet in the Solar System is Olympus Mons on Mars at 21,171 m, there is no universally accepted definition of a mountain. Elevation, volume, relief, steepness, spacing and continuity have been used as criteria for defining a mountain, whether a landform is called a mountain may depend on local usage. The highest point in San Francisco, California, is called Mount Davidson, notwithstanding its height of 300 m, similarly, Mount Scott outside Lawton, Oklahoma is only 251 m from its base to its highest point. Whittows Dictionary of Physical Geography states Some authorities regard eminences above 600 metres as mountains, in addition, some definitions also include a topographical prominence requirement, typically 100 or 500 feet. For a while, the US defined a mountain as being 1,000 feet or taller, any similar landform lower than this height was considered a hill. However, today, the United States Geological Survey concludes that these terms do not have technical definitions in the US, using these definitions, mountains cover 33% of Eurasia, 19% of South America, 24% of North America, and 14% of Africa. As a whole, 24% of the Earths land mass is mountainous, there are three main types of mountains, volcanic, fold, and block. All three types are formed from plate tectonics, when portions of the Earths crust move, crumple, compressional forces, isostatic uplift and intrusion of igneous matter forces surface rock upward, creating a landform higher than the surrounding features. The height of the feature makes it either a hill or, if higher and steeper, major mountains tend to occur in long linear arcs, indicating tectonic plate boundaries and activity. Volcanoes are formed when a plate is pushed below another plate, at a depth of around 100 km, melting occurs in rock above the slab, and forms magma that reaches the surface. When the magma reaches the surface, it builds a volcanic mountain. Examples of volcanoes include Mount Fuji in Japan and Mount Pinatubo in the Philippines, the magma does not have to reach the surface in order to create a mountain, magma that solidifies below ground can still form dome mountains, such as Navajo Mountain in the US
Mountain
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Mount Everest, the highest peak on Earth
Mountain
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Chimborazo,
Ecuador. The point on Earth's surface farthest from its center.
Mountain
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Aiguille du Dru in the
French Alps
Mountain
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The
Matterhorn,
Swiss Alps
