DOI: 10.1002/2015GL066058
论文题名: Organic carbon remobilized from thawing permafrost is resequestered by reactive iron on the Eurasian Arctic Shelf
作者: Salvadõ J.A. ; Tesi T. ; Andersson A. ; Ingri J. ; Dudarev O.V. ; Semiletov I.P. ; Gustafsson Ö.
刊名: Geophysical Research Letters
ISSN: 0094-8572
EISSN: 1944-8303
出版年: 2015
卷: 42, 期: 19 起始页码: 8122
结束页码: 8130
语种: 英语
英文关键词: carbon cycle
; carbon sequestration
; permafrost
; reactive iron
Scopus关键词: Feedback
; Iron
; Marine biology
; Organic carbon
; Permafrost
; Thawing
; Carbon cycles
; Carbon sequestration
; Climate feedbacks
; Coastal erosion
; East-siberian seas
; Marine planktons
; Ocean system
; Statistical sources
; Iron compounds
; carbon isotope
; carbon sequestration
; climate feedback
; coastal zone
; iron
; land-sea interaction
; organic carbon
; permafrost
; plankton
; remobilization
; thawing
; topsoil
; Arctic
; Arctic Ocean
; East Siberian Sea
; Kara Sea
; Laptev Sea
; Siberia
英文摘要: Given the potential for permafrost carbon (PF/C)-climate feedbacks in the Siberian-Arctic land-ocean system, there is a need for understanding the fate of thawed-out PF/C. Here we show that the sequestration of OC by reactive iron (OC-Fe) ranges between 0.5 and 22% on the Eurasian Arctic Shelf, with higher values in the Kara Sea (KS) (18 ± 6%) and the Laptev Sea (LS) (14 ± 4%). The Δ14C/δ13C signatures of the OC-Fe are substantially older and more terrestrial than the bulk sediment OC in the LS but younger and more dominated by marine plankton sources in the East Siberian Sea (ESS). Statistical source apportionment modeling reveal that reactive iron phases resequestered 15 ± 5% of thawing PF/C in the LS and 6.4 ± 5% in the ESS, derived from both coastal erosion of ice complex deposit and thawing topsoil. This Fe-associated trap of PF/C constitutes a reduction of the degradation/outgassing and thus also an attenuation of the PF/C-climate feedback. Key Points Insights on what OC fractions are trapped by reactive Fe phases The thawed PF/C is partly trapped by reactive Fe on the largest Arctic shelf This rusty carbon sink attenuates the PF/C-climate feedback © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946950148&doi=10.1002%2f2015GL066058&partnerID=40&md5=f0b0654b75c8a2ff37de836932ba5cf7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8188
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Environmental Science and Analytical Chemistry, ACES, Stockholm University, Stockholm, Sweden
Recommended Citation:
Salvadõ J.A.,Tesi T.,Andersson A.,et al. Organic carbon remobilized from thawing permafrost is resequestered by reactive iron on the Eurasian Arctic Shelf[J]. Geophysical Research Letters,2015-01-01,42(19).