DOI: 10.1002/2014GL059514
论文题名: Evidence for permafrost thaw and transport from an Alaskan North Slope watershed
作者: Schreiner K.M. ; Bianchi T.S. ; Rosenheim B.E.
刊名: Geophysical Research Letters
ISSN: 0094-10104
EISSN: 1944-9835
出版年: 2014
卷: 41, 期: 9 起始页码: 3117
结束页码: 3126
语种: 英语
英文关键词: Beaufort Sea
; Colville River
; permafrost thaw
; POC
; radiocarbon
; ramped-temperature pyrolysis
Scopus关键词: Carbon
; Rivers
; Sediments
; Shore protection
; Submarine geology
; Thawing
; Watersheds
; Beaufort sea
; Permafrost thaws
; POC
; Pyrolysis analysis
; radiocarbon
; Radiocarbon analysis
; Ramped temperatures
; Shoreline erosion
; Permafrost
; carbon cycle
; mobilization
; particulate organic carbon
; permafrost
; Pleistocene
; pyrolysis
; radiocarbon dating
; soil type
; thawing
; Alaska
; Arctic Ocean
; Beaufort Sea
; Colville River
; North Slope
; United States
英文摘要: Burial of organic carbon (OC) in marine sediments is one of the most important linkages between the short-term biologic carbon cycle and the long-term geologic carbon cycle. Yet much is still unknown about the fate of terrigenous OC in marine coastal margins. Here the delivery of particulate OC (POC) to the Colville River deltaic region in the Alaskan Beaufort Sea by particulates of varying densities is studied through the use of ramped temperature pyrolysis and radiocarbon analyses. The Colville River is the largest river in North America whose watershed is underlain completely by high Arctic permafrost tundra. A variety of sources of POC are considered, including terrestrial soils, Pleistocene-aged yedoma-like sediments, coastal peat erosion, and marine POC. We provide the first evidence that riverine POC from the Colville River contains old (Pleistocene-sourced) OC, suggesting ongoing thaw and mobilization of yedoma-like permafrost OC from this northern Alaskan watershed. Additionally, much of this OC appears to be fairly labile and therefore could be readily oxidized and returned to the atmosphere. Key Points Deep permafrost POC breakdown is indicated in the Alaskan Arctic Coastal peaty shoreline erosion is indicated in the Alaskan Beaufort Sea Ramped-temperature pyrolysis analysis indicates POC source in Arctic sediments © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84901928136&doi=10.1002%2f2014GL059514&partnerID=40&md5=53ead598f5c3a064fbc8258e1591cba7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7368
Appears in Collections: 气候减缓与适应
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作者单位: Department of Oceanography, Texas AandM University, College Station, TX, United States
Recommended Citation:
Schreiner K.M.,Bianchi T.S.,Rosenheim B.E.. Evidence for permafrost thaw and transport from an Alaskan North Slope watershed[J]. Geophysical Research Letters,2014-01-01,41(9).