气候变化领域集成服务门户(CCPortal): Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost

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DOI	10.1073/pnas.1811797116
	Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost
	Wild B.; Andersson A.; Bröder L.; Vonk J.; Hugelius G.; McClelland J.W.; Song W.; Raymond P.A.; Gustafsson Ö.
发表日期	2019
ISSN	0027-8424
起始页码	10280
结束页码	10285
卷号	116 期号:21
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.
英文关键词	carbon cycle; climate change; leaching; peat; radiocarbon
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158873
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, Unite...
推荐引用方式 GB/T 7714	Wild B.,Andersson A.,Bröder L.,et al. Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost[J],2019,116(21).
APA	Wild B..,Andersson A..,Bröder L..,Vonk J..,Hugelius G..,...&Gustafsson Ö..(2019).Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost.Proceedings of the National Academy of Sciences of the United States of America,116(21).
MLA	Wild B.,et al."Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost".Proceedings of the National Academy of Sciences of the United States of America 116.21(2019).