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| Titel |
Response of permafrost carbon to post-glacial warming |
| VerfasserIn |
Tommaso Tesi, Francesco Muschitiello, Rienk Smittenberg, Martin Jakobsson, Pete Hill, Jorien Vonk, August Andersson, Nina Kirchner, Riko Noormetsriko, Oleg Dudarev, Igor Semiletov, Örjan Gustafsson |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149910
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| Publikation (Nr.) |
 EGU/EGU2017-14310.pdf |
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| Zusammenfassung |
| The last glacial-interglacial transition represents a major climatic reorganization during which
the Northern Hemisphere became warmer while the atmospheric CO2 rose from ca. 190 parts
per million by volume (ppmv) to ca. 270 ppmv. 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. However, direct
physical indications for such PF-C release have so far been absent. Here we use
sediment cores from the Laptev Sea (Arctic Ocean) to investigate PF-C destabilization
during the last glacial-interglacial period. Our paleo-environmental reconstruction
indicates massive supply of PF-C from Siberian soils in response to the warming.
We infer that the rapid active-layer deepening during the last glacial-interglacial
transition released large quantity of soil carbon resulting in high land-derived OC
supply to the Laptev Sea. Thawing of PF-C must also have brought about enhanced
organic matter respiration on land and, thus, these findings suggest that thermal
reactivation of dormant permafrost might have been an important source of carbon.
This study presents observation-based evidence of massive PF-C destabilization
during past warming events and contributes a new angle to the ongoing debate on
mechanisms driving the increase of atmospheric CO2 during the last deglaciation. |
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