Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/ab2653 |
Permafrost-carbon mobilization in Beringia caused by deglacial meltwater runoff, sea-level rise and warming | |
Meyer, Vera D.1,2,3; Hefter, Jens1; Koehler, Peter1; Tiedemann, Ralf1; Gersonde, Rainer1; Wacker, Lukas4; Mollenhauer, Gesine1,2,3 | |
2019-08-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2019 |
卷号 | 14期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Switzerland |
英文摘要 | During the last deglaciation (18-8 kyr BP), shelf flooding and warming presumably led to a large-scale decomposition of permafrost soils in the mid-to-high latitudes of the Northern Hemisphere. Microbial degradation of old organic matter released from the decomposing permafrost potentially contributed to the deglacial rise in atmospheric CO2 and also to the declining atmospheric radiocarbon contents (Delta C-14). The significance of permafrost for the atmospheric carbon pool is not well understood as the timing of the carbon activation is poorly constrained by proxy data. Here, we trace the mobilization of organic matter from permafrost in the Pacific sector of Beringia over the last 22 kyr using mass-accumulation rates and radiocarbon signatures of terrigenous biomarkers in four sediment cores from the Bering Sea and the Northwest Pacific. We find that pronounced reworking and thus the vulnerability of old organic carbon to remineralization commenced during the early deglaciation (similar to 16.8 kyr BP) when meltwater runoff in the Yukon River intensified riverbank erosion of permafrost soils and fluvial discharge. Regional deglaciation in Alaska additionally mobilized significant fractions of fossil, petrogenic organic matter at this time. Permafrost decomposition across Beringia's Pacific sector occurred in two major pulses that match the Bolling-Allerod and Preboreal warm spells and rapidly initiated within centuries. The carbon mobilization likely resulted from massive shelf flooding during meltwater pulses 1A (similar to 14.6 kyr BP) and 1B (similar to 11.5 kyr BP) followed by permafrost thaw in the hinterland. Our findings emphasize that coastal erosion was a major control to rapidly mobilize permafrost carbon along Beringia's Pacific coast at similar to 14.6 and similar to 11.5 kyr BP implying that shelf flooding in Beringia may partly explain the centennial-scale rises in atmospheric CO2 at these times. Around 16.5 kyr BP, the mobilization of old terrigenous organic matter caused by meltwater-floods may have additionally contributed to increasing CO2 levels. |
英文关键词 | deglaciation permafrost decomposition Beringia Bering Sea biomarker atmospheric CO2 Northwest Pacific |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000478754100002 |
WOS关键词 | LAST GLACIAL MAXIMUM ; ORGANIC-MATTER ; TERRESTRIAL CARBON ; THERMOKARST LAKES ; BROOKS RANGE ; OLD CARBON ; SEDIMENTS ; CLIMATE ; PACIFIC ; EAST |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/185628 |
专题 | 气候变化 |
作者单位 | 1.Alfred Wegener Inst Helmholtz Zentrum Polar & Mee, D-27570 Bremerhaven, Germany; 2.Univ Bremen, Dept Geosci, D-28359 Bremen, Germany; 3.MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany; 4.Swiss Fed Inst Technol, Lab Ion Beam Phys, Dept Phys, CH-8093 Zurich, Switzerland |
推荐引用方式 GB/T 7714 | Meyer, Vera D.,Hefter, Jens,Koehler, Peter,et al. Permafrost-carbon mobilization in Beringia caused by deglacial meltwater runoff, sea-level rise and warming[J]. ENVIRONMENTAL RESEARCH LETTERS,2019,14(8). |
APA | Meyer, Vera D..,Hefter, Jens.,Koehler, Peter.,Tiedemann, Ralf.,Gersonde, Rainer.,...&Mollenhauer, Gesine.(2019).Permafrost-carbon mobilization in Beringia caused by deglacial meltwater runoff, sea-level rise and warming.ENVIRONMENTAL RESEARCH LETTERS,14(8). |
MLA | Meyer, Vera D.,et al."Permafrost-carbon mobilization in Beringia caused by deglacial meltwater runoff, sea-level rise and warming".ENVIRONMENTAL RESEARCH LETTERS 14.8(2019). |
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