DOI: 10.1002/2015GL066296
论文题名: Long-term anoxia and release of ancient, labile carbon upon thaw of Pleistocene permafrost
作者: Ewing S.A. ; O'Donnell J.A. ; Aiken G.R. ; Butler K. ; Butman D. ; Windham-Myers L. ; Kanevskiy M.Z.
刊名: Geophysical Research Letters
ISSN: 0094-8290
EISSN: 1944-8021
出版年: 2015
卷: 42, 期: 24 起始页码: 10730
结束页码: 10738
语种: 英语
英文关键词: acetate
; ammonium
; dissolved organic carbon
; permafrost
; uranium activity ratios
; yedoma
Scopus关键词: Isotopes
; Nuclear fuels
; Permafrost
; Stream flow
; Thawing
; Uranium
; Acetate
; Activity ratios
; Ammonium
; Dissolved organic carbon
; Yedoma
; Organic carbon
; acetate
; ammonium
; anoxic conditions
; calcium
; carbon flux
; climate feedback
; concentration (composition)
; dissolved organic carbon
; long-term change
; organic acid
; permafrost
; Pleistocene
; thawing
; uranium isotope
; warming
; Alaska
; United States
英文摘要: The fate of permafrost carbon upon thaw will drive feedbacks to climate warming. Here we consider the character and context of dissolved organic carbon (DOC) in yedoma permafrost cores from up to 20 m depth in central Alaska. We observed high DOC concentrations (4 to 129 mM) and consistent low molecular weight organic acid concentrations in three cores. We estimate a DOC production rate of 12 μmol DOC m-2 yr-1 based on model ages of up to ~200 kyr derived from uranium isotopes. Acetate C accounted for 24 ± 1% of DOC in all samples. This proportion suggests long-term anaerobiosis and is likely to influence thaw outcomes due to biolability of acetate upon release in many environments. The combination of uranium isotopes, ammonium concentrations, and calcium concentrations explained 86% of the variation in thaw water DOC concentrations, suggesting that DOC production may be related to both reducing conditions and mineral dissolution over time. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955189914&doi=10.1002%2f2015GL066296&partnerID=40&md5=ded7cad3f80d54b96fa44e6e80088492
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7906
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: U.S. Geological Survey, Boulder, CO, United States
Recommended Citation:
Ewing S.A.,O'Donnell J.A.,Aiken G.R.,et al. Long-term anoxia and release of ancient, labile carbon upon thaw of Pleistocene permafrost[J]. Geophysical Research Letters,2015-01-01,42(24).