Permafrost Degradation in the Western Sector of Russian Arctic under Climate Change

Vasiliev, A.; Streletskiy; Drozdov, D.; Streletskaya, I.; Malkova, G.

Авторы: Vasiliev, A, Streletskiy, Drozdov, D, Streletskaya, I, Malkova, G
Сборник: NGF Abstracts and Proceedings
Том: 1
Глава в коллективной монографии
Год издания: 2020
Место издания: Norsk Geologisk Forening Trondheim, Norway
Первая страница: 225
Последняя страница: 226
Аннотация: Permafrost plays an important role in the functioning of ecosystems and strongly affects human activities in the Arctic. Numerous studies have documented permafrost warming, increasing in the active layer thickness, and the northward retreat of southern permafrost boundaries caused by global climate change. The Russian European Arctic and Western Siberia are regions that have experienced some of the highest rates of permafrost degradation.While climatic factors play major role in permafrost and active layer dynamics across large regions, local vegetation and soil variability can also significantly affect these trends. The variable response of the permafrost system to changing climatic conditions requires further investigations to better inform large scale models of socio-ecological and economic systems of Russian permafrost regions.Long-term data from eight permafrost monitoring sites were collected to evaluate permafrost change in ecosystems typical of the Russian European North and West Siberia. All bioclimatic zones from typical tundra to northern taiga are covered by permafrost monitoring. Our study evaluates climate changes across the region and how these changes affect permafrost temperature and active layer thickness. Sites located in typical tundra on continuous permafrost show increases in active layer thickness from 1.0 to 1.2 m during the period from 1997 to 2018. Sites located in southern tundra show evidence of permafrost table lowering from 1.2 m below the ground surface in 2000 to 1.8 m in 2016. The greatest changes in the position of permafrost table were found in well-drained landscapes of forest-tundra zone. The lowering of permafrost table in Southern Urnegoy region was noticeable in the mid-1980s, but accelerated in the 2000s until it reached 10 m by 2014. Northern taiga ecosystems on permafrost are generally represented by bogs interspersed with elevated polygonal peatlands. While permafrost table in bogs lowered to 4 m below the ground surface, the permafrost table in peatlands is relatively stable.
Добавил в систему: Стрелецкая Ирина Дмитриевна

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