气候变化领域集成服务门户(CCPortal): Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts

CCPortal

DOI	10.1029/2020GL088561
	Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts
	Jong D.; Bröder L.; Tanski G.; Fritz M.; Lantuit H.; Tesi T.; Haghipour N.; Eglinton T.I.; Vonk J.E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	Collapse of permafrost coasts delivers large quantities of particulate organic carbon (POC) to Arctic coastal areas. With rapidly changing environmental conditions, sediment and organic carbon (OC) mobilization and transport pathways are also changing. Here, we assess the sources and sinks of POC in the highly dynamic nearshore zone of Herschel Island-Qikiqtaruk (Yukon, Canada). Our results show that POC concentrations sharply decrease, from 15.9 to 0.3 mg L−1, within the first 100–300 m offshore. Simultaneously, radiocarbon ages of POC drop from 16,400 to 3,600 14C years, indicating rapid settling of old permafrost POC to underlying sediments. This suggests that permafrost OC is, apart from a very narrow resuspension zone (<5 m water depth), predominantly deposited in nearshore sediments. While long-term storage of permafrost OC in marine sediments potentially limits biodegradation and its subsequent release as greenhouse gas, resuspension of fine-grained, OC-rich sediments in the nearshore zone potentially enhances OC turnover. © 2020. The Authors.
英文关键词	Biodegradation; Coastal engineering; Greenhouse gases; Offshore oil well production; Permafrost; Sediments; Submarine geology; Environmental conditions; Long-term storage; Marine sediments; Near-shore zones; Particulate organic carbon; Radiocarbon age; Re-suspension; Transport pathways; Organic carbon; biodegradation; carbon storage; dissolved inorganic carbon; nearshore dynamics; organic carbon; particulate organic carbon; permafrost; radiocarbon dating; resuspension; soil erosion; Arctic Coastal Plain; Canada; Herschel Island; Yukon Territory
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/169993
作者单位	Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands; Geological Institute, Swiss Federal Institute of Technology (ETH), Zürich, Switzerland; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany; Institute for Geosciences, University of Potsdam, Potsdam, Germany; CRN, Institute of Polar Sciences, Bologna, Italy
推荐引用方式 GB/T 7714	Jong D.,Bröder L.,Tanski G.,et al. Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts[J],2020,47(15).
APA	Jong D..,Bröder L..,Tanski G..,Fritz M..,Lantuit H..,...&Vonk J.E..(2020).Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts.Geophysical Research Letters,47(15).
MLA	Jong D.,et al."Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts".Geophysical Research Letters 47.15(2020).