Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, Svante Arrhenius väg 8, SE-11418 Stockholm, Sweden.
Bolin Centre for Climate Research, Stockholm University, SE-106 91 Stockholm, Sweden.
Nat Commun. 2016 Nov 29;7:13653. doi: 10.1038/ncomms13653.
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 CO 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 CO across the extensive permafrost domain. The results challenge current paradigms on the post-glacial CO rise and, at the same time, serve as a harbinger for possible consequences of the present-day warming of PF-C soils.
最近的假设基于大气记录和模型表明，末次冰期积累的永久冻土碳（PF-C）可能是冰期后变暖期间大气 CO 上升的一个重要来源。然而，到目前为止，还没有直接的物理证据表明存在这种 PF-C 释放。在这里，我们利用拉普捷夫海（北冰洋）作为档案来研究末次冰期-间冰期期间 PF-C 的不稳定性。我们的结果表明，西伯利亚土壤的大量 PF-C 供应是由于响应变暖而导致的活跃层深度剧烈加深的结果。PF-C 的融化也必然导致有机物质呼吸的增强，因此，这些发现表明，PF-C 确实可能是广泛的永久冻土区域 CO 的一个重要来源。这些结果挑战了当前关于冰期后 CO 上升的范例，同时也预示着当前 PF-C 土壤变暖可能带来的后果。
