Thawing has released methane gas through the decomposition of plants and animals once frozen in the soil and through the formation of cracks that connect deeper methane-filled gas pockets to the surface. In some cases, the sudden release of built-up pressure in these gas pockets can be ...
Warmer conditions in terrestrial and subsea permafrost may be giving rise to a positive feedback loop driving the process of permafrost thawing. Thawing has releasedmethanegas through the decomposition of plants and animals once frozen in thesoiland through theformationof cracks that connect deeper met...
(LGGE, UMR 5183), Grenoble, France 6.Agriculture and Agri‐Foods Canada, Ottawa, Canada 2Abstract Permafrost soils contain enormous amounts of organic carbon, which could act as a positive feedback to global climate change due to enhanced respiration rates with warming. We have used a ...
So, the arctic and sub-arctic ecosystems are turning into a source of carbon dioxide, instead of storing carbon dioxide previously locked up in the permafrost. Further degradation and formation of taliks (an unfrozen section of ground found above, below, or within a layer of permafrost) will ...
Elsewhere in the Andes, active and inactive rock glaciers occupy indistinguishable elevation bands, regardless of aspect, the formation mechanism, or shape of rock glaciers. The state of rock glacier activity predicts differences in elevations of toes to 140 m at best so that regional inference ...
11). The movement to the freezing plane is accomplished by electrostatic and osmotic forces involving movement of the water over the grain surfaces as described above. The amount of its movement is referred to as suction potential. Since the formation of ice crystals involves re-orientation of ...
The rate of river migration affects the stability of Arctic infrastructure and communities1,2 and regulates the fluxes of carbon3,4, nutrients5 and sediment6,7 to the oceans. However, predicting how the pace of river migration will change in a warming Arctic8 has so far been stymied by conf...
We develop a permafrost classification system to describe the complex interaction of climatic and ecological processes in permafrost formation and degradat... YL Shur,MT Jorgenson - 《Permafrost & Periglacial Processes》 被引量: 463发表: 2010年 Warming permafrost in European mountains Here we present...
However, this would require the formation of a proglacial lake along the southern margin of the BSIS and the subsequent subglacial accumulation of riverine and lacustrine material from inland beneath the ice sheet, followed by subglacial transport across the entire BSIS from south to north. From a...
The nature, formation and extent of permafrost in glacial environments Permafrostis defined as “ground (i.e., soil and/or rock) that remains at or below 0°C for at least two consecutive years” (French, 2018, p. 70). Defined simply by temperature and time, the term permafrost encompass...