气候变化领域集成服务门户(CCPortal): An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers

CCPortal

DOI	10.1029/2020GL088823
	An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers
	Schwab M.S.; Hilton R.G.; Raymond P.A.; Haghipour N.; Amos E.; Tank S.E.; Holmes R.M.; Tipper E.T.; Eglinton T.I.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	Permafrost thaw in Arctic watersheds threatens to mobilize hitherto sequestered carbon. We examine the radiocarbon activity (F14C) of dissolved organic carbon (DOC) in the northern Mackenzie River basin. From 2003–2017, DOC-F14C signatures (1.00 ± 0.04; n = 39) tracked atmospheric 14CO2, indicating export of “modern” carbon. This trend was interrupted in June 2018 by the widespread release of aged DOC (0.85 ± 0.16, n = 28) measured across three separate catchment areas. Increased nitrate concentrations in June 2018 lead us to attribute this pulse of 14C-depleted DOC to mobilization of previously frozen soil organic matter. We propose export through lateral perennial thaw zones that occurred at the base of the active layer weakened by preceding warm summer and winter seasons. Although we are not yet able to ascertain the broader significance of this “anomalous” mobilization event, it highlights the potential for rapid and large-scale release of aged carbon from permafrost. © 2020. The Authors.
英文关键词	Catchments; Permafrost; Stream flow; Thawing; Watersheds; Arctic rivers; Catchment area; Dissolved organic carbon; Mackenzie river basin; Nitrate concentration; Permafrost thaws; Soil organic matters; Winter seasons; Organic carbon; active layer; catchment; dissolved organic carbon; mobilization; nitrate; permafrost; soil organic matter; summer; thawing; winter; Mackenzie River [Northwest Territories]
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169365
作者单位	Department of Earth Sciences, ETH Zurich, Zurich, Switzerland; Department of Geography, Durham University, Durham, United Kingdom; Yale School of Forestry and Environmental Studies, Yale University, New Haven, CT, United States; Laboratory of Ion Beam Physics, ETH Zurich, Zurich, Switzerland; Aurora Research Institute, Inuvik, NT, Canada; Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada; Woods Hole Research Center, Falmouth, MA, United States; Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Schwab M.S.,Hilton R.G.,Raymond P.A.,et al. An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers[J],2020,47(23).
APA	Schwab M.S..,Hilton R.G..,Raymond P.A..,Haghipour N..,Amos E..,...&Eglinton T.I..(2020).An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers.Geophysical Research Letters,47(23).
MLA	Schwab M.S.,et al."An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers".Geophysical Research Letters 47.23(2020).