Scientific Publication Permafrost coasts make up about one third of the Earth’s total coastline. As a result of accelerated climate change, whole sections of coastline rapidly thaw, and erode into the [...] now shows that large amounts of carbon dioxide are potentially being produced along these eroding permafrost coastlines in the Arctic.
simulation of erosion and mass wasting processes in permafrost landscapes under a warming climate. Current land surface models used to simulate permafrost dynamics are not capable to represent soil erosion [...] between erosion-induced landscape changes and permafrost degradation? In order to answer these crucial questions we will extend and improve the permafrost model CryoGrid3 developed by the Alfred Wegener [...] Background Impacts of permafrost degradation (Graphic: Alfred-Wegener-Institut) Almost a quarter of the land surface of the northern hemisphere of the earth is characterized by permanently frozen soils
Permafrost For years now, scientists have been investigating how the gradual thawing of near-surface permafrost, which takes place in the uppermost layers of Arctic soils and in the course of decades [...] another phenomenon, which has only been sporadically investigated: the abrupt thawing of ice-rich permafrost, which can transform entire landscapes in only months of years through subsidence, the formation
Nature Communications Study The loss of arctic permafrost deposits by coastal erosion could amplify climate warming via the greenhouse effect. A study using sediment samples from the Sea of Okhotsk [...] Okhotsk on the eastern coast of Russia led by AWI researchers revealed that the loss of Arctic permafrost at the end of the last glacial period led to repeated sudden increases in the carbon dioxide concentration
needleleaf classes and permafrost extent after Kotlyakov and Khromova: Land Resources of Russia – Maps of Permafrost and Ground Ice, Version 1, NSIDC 2002) Boreal forests in permafrost regions make up around [...] vegetation – permafrost dynamics can have a potentially high impact on the numerous feedback mechanisms between the two ecosystem components. Increased soil carbon release from thawing permafrost through the [...] to understand how the interactions between the vegetation, permafrost and the atmosphere stabilize the forests and the underlying permafrost. A one-dimensional land surface model (CryoGrid) is adapted
Permafrost Throughout the Arctic, ice wedges are thawing at a rapid pace. Changes to these structures, which are very common in permafrost landscapes, have a massive impact on the hydrology of the tundra
of permafrost characteristics. In addition to their remoteness and difficult accessibility, all of them are vulnerable to rapid external disturbances due to the presence of very ice-rich permafrost close [...] characteristics of the surrounding permafrost because of the high heat storage capacity of water. A comprehensive inventory of thermokarst lakes in ice-rich permafrost and the documentation of current lake [...] not only very exciting visually but convey important scientific information on the stability of permafrost and changes in the northern the carbon cycle. The Siberian and Alaskan key study regions of the
for his doctoral thesis, which represents a valuable contribution toward refining simulations of permafrost development: in it, he demonstrates the importance of small-scale landscape characteristics, since [...] a result of thawing. In the future, his findings could help provide a more realistic picture of permafrost thawing.
including these highly dynamic permafrost environments in future permafrost carbon estimations. Link to journal Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia Top: [...] order to account for high variability of permafrost and thermokarst environments in pan-permafrost soil C and N pool estimates. Link to journal Deep Yedoma permafrost: A synthesis of depositional characteristics [...] observed in permafrost regions of Eurasia and North America. Link to journal Tundra fires destabilize permafrost Comparison between the two airborne LiDAR datasets showing clear permafrost terrain subsidence