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Permafrost
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Permafrost is soil or underwater sediment which continuously remains below 0 °C for two years or more; the oldest permafrost has been continuously frozen for around 700,000 years. Whilst the shallowes
Permafrost temperature profile. Permafrost occupies the middle zone, with the active layer above it, while geothermal activity keeps the lowest layer above freezing. The vertical 0 °C or 32 °F line denotes the average annual temperature that is crucial for the upper and lower limit of the permafrost zone, while the red lines represent seasonal temperature changes and seasonal temperature extremes. Solid curved lines at the top show seasonal maximum and minimum temperatures in the active layer, while the red dotted-to-solid line depicts the average temperature profile with depth of soil in a permafrost region.
Permafrost temperature profile. Permafrost occupies the middle zone, with the active layer above it, while geothermal activity keeps the lowest layer
Excavating ice-rich permafrost with a jackhammer in Alaska.
Excavating ice-rich permafrost with a jackhammer in Alaska.
Changes in subsea permafrost extent and structure between the Last Glacial Maximum and 2020.
Changes in subsea permafrost extent and structure between the Last Glacial Maximum and 2020.
A group of palsas, as seen from above, formed by the growth of ice lenses.
A group of palsas, as seen from above, formed by the growth of ice lenses.
Tibetan Plateau
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The Tibetan Plateau, also known as the Qinghai–Tibet Plateau, Qingzang Plateau, is a vast elevated plateau located at the intersection of Central, South, and East Asia. Geographically, Tibet is locate
Permafrost
…km2 (6.9 million sq mi). This includes large areas of Alaska, Canada, Greenland, and Siberia. It is also located in high mountain regions, with the Tibetan Plateau being a prominent example. Only a minority of permafrost exists in the Southern Hemisphere, where it is consigned to mountain slopes like in the Andes…
The Tibetan Plateau lies between the Himalayan range to the south and the Taklamakan Desert to the north. (Composite image)
The Tibetan Plateau lies between the Himalayan range to the south and the Taklamakan Desert to the north. (Composite image)
Yamdrok Lake is one of the four largest lakes in Tibet. All four lakes are considered sacred pilgrimage sites in the local tradition.
Yamdrok Lake is one of the four largest lakes in Tibet. All four lakes are considered sacred pilgrimage sites in the local tradition.
Yangbajain valley to the north of Lhasa
Yangbajain valley to the north of Lhasa
Pastoral nomads camping near Namtso.
Pastoral nomads camping near Namtso.