Massive remobilization of permafrost carbon during post-glacial warming
Recent hypotheses, based on atmospheric records and models, suggest that permafrost carbon (PF-C) accumulated during the last glaciation may have been an important source for the atmospheric CO₂ rise during post-glacial warming. However, direct physical indications for such PF-C release have so far...
Main Authors: | , , , , , , , , , , , |
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Format: | Text |
Language: | unknown |
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Columbia University
2016
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Online Access: | https://dx.doi.org/10.7916/d8gq6z65 https://academiccommons.columbia.edu/doi/10.7916/D8GQ6Z65 |
Summary: | Recent hypotheses, based on atmospheric records and models, suggest that permafrost carbon (PF-C) accumulated during the last glaciation may have been an important source for the atmospheric CO₂ rise during post-glacial warming. However, direct physical indications for such PF-C release have so far been absent. Here we use the Laptev Sea (Arctic Ocean) as an archive to investigate PF-C destabilization during the last glacial–interglacial period. Our results show evidence for massive supply of PF-C from Siberian soils as a result of severe active layer deepening in response to the warming. Thawing of PF-C must also have brought about an enhanced organic matter respiration and, thus, these findings suggest that PF-C may indeed have been an important source of CO₂ across the extensive permafrost domain. The results challenge current paradigms on the post-glacial CO₂ rise and, at the same time, serve as a harbinger for possible consequences of the present-day warming of PF-C soils. |
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