Sökning: WFRF:(McClelland James W.)
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Rivers across the S...
Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost
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- Wild, Birgit (författare)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
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- Andersson, August (författare)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
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- Bröder, Lisa (författare)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi,Vrije Universiteit, Amsterdam, The Netherlands
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Vonk, Jorien (författare)
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- Hugelius, Gustaf (författare)
- Stockholms universitet,Institutionen för naturgeografi
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McClelland, James W. (författare)
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Song, Wenjun (författare)
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Raymond, Peter A. (författare)
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- Gustafsson, Örjan (författare)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
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(creator_code:org_t)
- 2019-05-06
- 2019
- Engelska.
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 116:21, s. 10280-10285
- Relaterad länk:
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https://doi.org/10.1...
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https://www.pnas.org...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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 C-14 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 C-14-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 C-14-based fingerprinting of fluvial organic carbon thus provides an opportunity to elucidate large-scale dynamics of PP-C remobilization in response to Arctic warming.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
Nyckelord
- carbon cycle
- climate change
- radiocarbon
- peat
- leaching
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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