DOI: 10.1002/2015GL063498
论文题名: Detecting the signature of permafrost thaw in Arctic rivers
作者: Spencer R.G.M. ; Mann P.J. ; Dittmar T. ; Eglinton T.I. ; McIntyre C. ; Holmes R.M. ; Zimov N. ; Stubbins A.
刊名: Geophysical Research Letters
ISSN: 0094-9275
EISSN: 1944-9006
出版年: 2015
卷: 42, 期: 8 起始页码: 2830
结束页码: 2835
语种: 英语
英文关键词: Arctic
; organic carbon
; organic matter
; permafrost
; river
Scopus关键词: Bacteria
; Biological materials
; Carbon
; Climate change
; Decay (organic)
; Microorganisms
; Organic carbon
; Rivers
; Thawing
; Arctic
; Arctic rivers
; Chemical signatures
; Decay rate
; Dissolved organic carbon
; Headwater stream
; Molecular signatures
; Permafrost thaws
; Permafrost
; arctic environment
; dissolved organic carbon
; headwater
; microbial activity
; permafrost
; river system
; thawing
; Kolyma River
; Russian Federation
英文摘要: Climate change induced permafrost thaw in the Arctic is mobilizing ancient dissolved organic carbon (DOC) into headwater streams; however, DOC exported from the mouth of major arctic rivers appears predominantly modern. Here we highlight that ancient (>20,000 years B.P.) permafrost DOC is rapidly utilized by microbes (∼50% DOC loss in <7 days) and that permafrost DOC decay rates (0.12 to 0.19 day-1) exceed those for DOC in a major arctic river (Kolyma: 0.09 day-1). Permafrost DOC exhibited unique molecular signatures, including high levels of aliphatics that were rapidly utilized by microbes. As microbes processed permafrost DOC, its distinctive chemical signatures were degraded and converged toward those of DOC in the Kolyma River. The extreme biolability of permafrost DOC and the rapid loss of its distinct molecular signature may explain the apparent contradiction between observed permafrost DOC release to headwaters and the lack of a permafrost signal in DOC exported via major arctic rivers to the ocean. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929340415&doi=10.1002%2f2015GL063498&partnerID=40&md5=05c28e3096d35508a05082c1f73a1ec2
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8891
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States
Recommended Citation:
Spencer R.G.M.,Mann P.J.,Dittmar T.,et al. Detecting the signature of permafrost thaw in Arctic rivers[J]. Geophysical Research Letters,2015-01-01,42(8).