Subsidence (atmosphere)
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In meteorology, subsidence is the downward movement of an air parcel as it cools and becomes denser. By contrast, warm air becomes less dense and moves upwards.
Subsidence above the Congo River Basin including the Congo River and some tributaries. Note the lack of clouds above the rivers due to subsidence of colder air which precludes convection, convection being the inverse process to subsidence. Source: NASA
Dosen barometer showing different kinds of weather, according to atmospheric pressure, being high pressure an indication of fair weather because of atmospheric subsidence, and being rapidly diminishing pressure, a sign to a bad weather system approaching.
High-pressure area
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A high-pressure air system, high, or anticyclone, is an area near the surface of a planet where the atmospheric pressure is greater than the pressure in the surrounding regions. Highs are middle-scale
Subsidence (atmosphere)
…and becomes denser. By contrast, warm air becomes less dense and moves upwards (atmospheric convection). Atmospheric subsidence generally creates a high-pressure area as more air moves into the same space: the polar highs are areas of almost constant subsidence, as are the horse latitudes, and the areas of subsidence…
The Hadley cell carries heat and moisture from the tropics towards the northern and southern mid-latitudes. It deposits drier air, contributing to the world's great deserts.