globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1811797116
论文题名:
Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost
作者: Wild B.; Andersson A.; Bröder L.; Vonk J.; Hugelius G.; McClelland J.W.; Song W.; Raymond P.A.; Gustafsson Ö.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:21
起始页码: 10280
结束页码: 10285
语种: 英语
英文关键词: carbon cycle ; climate change ; leaching ; peat ; radiocarbon
Scopus关键词: carbon ; carbon 14 ; organic carbon ; Arctic ; Article ; benchmarking ; carbon cycle ; environmental monitoring ; greenhouse effect ; leaching ; permafrost ; Pleistocene ; priority journal ; quantitative analysis ; river ; river basin ; Russian Federation ; seasonal variation ; spatiotemporal analysis ; surface soil ; thawing
英文摘要: Climate warming is expected to mobilize northern permafrost and peat organic carbon (PP-C), yet magnitudes and system specifics of even current releases are poorly constrained. While part of the PP-C will degrade at point of thaw to CO2 and CH4 to directly amplify global warming, another part will enter the fluvial network, potentially providing a window to observe large-scale PP-C remobilization patterns. Here, we employ a decade-long, high-temporal resolution record of 14C in dissolved and particulate organic carbon (DOC and POC, respectively) to deconvolute PP-C release in the large drainage basins of rivers across Siberia: Ob, Yenisey, Lena, and Kolyma. The 14C-constrained estimate of export specifically from PP-C corresponds to only 17 ± 8% of total fluvial organic carbon and serves as a benchmark for monitoring changes to fluvial PP-C remobilization in a warming Arctic. Whereas DOC was dominated by recent organic carbon and poorly traced PP-C (12 ± 8%), POC carried a much stronger signature of PP-C (63 ± 10%) and represents the best window to detect spatial and temporal dynamics of PP-C release. Distinct seasonal patterns suggest that while DOC primarily stems from gradual leaching of surface soils, POC reflects abrupt collapse of deeper deposits. Higher dissolved PP-C export by Ob and Yenisey aligns with discontinuous permafrost that facilitates leaching, whereas higher particulate PP-C export by Lena and Kolyma likely echoes the thermokarst-induced collapse of Pleistocene deposits. Quantitative 14C-based fingerprinting of fluvial organic carbon thus provides an opportunity to elucidate large-scale dynamics of PP-C remobilization in response to Arctic warming. © 2019 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163588
Appears in Collections:气候变化与战略

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作者单位: Wild, B., Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, 106 91, Sweden, Bolin Centre for Climate Research, Stockholm University, Stockholm, 106 91, Sweden; Andersson, A., Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, 106 91, Sweden; Bröder, L., Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, 106 91, Sweden, Bolin Centre for Climate Research, Stockholm University, Stockholm, 106 91, Sweden, Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, 1081 HV, Netherlands; Vonk, J., Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, 1081 HV, Netherlands; Hugelius, G., Bolin Centre for Climate Research, Stockholm University, Stockholm, 106 91, Sweden, Department of Physical Geography, Stockholm University, Stockholm, 106 91, Sweden; McClelland, J.W., Marine Science Institute, University of Texas at Austin, Port Aransas, TX 78373, United States; Song, W., Yale School of Forestry and Environmental Studies, New Haven, CT 06511, United States; Raymond, P.A., Yale School of Forestry and Environmental Studies, New Haven, CT 06511, United States; Gustafsson, Ö., Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, 106 91, Sweden, Bolin Centre for Climate Research, Stockholm University, Stockholm, 106 91, Sweden

Recommended Citation:
Wild B.,Andersson A.,Bröder L.,et al. Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(21)
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