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.
Excavating ice-rich permafrost with a jackhammer in Alaska.
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.
Norilsk
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Norilsk is an industrial closed city in Krasnoyarsk Krai, Russia, located south of the western Taymyr Peninsula, around 90 km east of the Yenisey River and 1,500 km north of Krasnoyarsk. Norilsk is 30
Permafrost
…large cities in the world built in areas of continuous permafrost (where the frozen soil forms an unbroken, below-zero sheet) and both are in Russia – Norilsk in Krasnoyarsk Krai and Yakutsk in the Sakha Republic. Building on permafrost is difficult because the heat of the building (or pipeline) can spread…
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Russia, Krasnojarsk, Norilsk, Норильск, Талнахская ул., 10 Талнахская ул., 10 WMID2158272
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The first house in Norilsk