气候变化领域集成服务门户(CCPortal): Development of perennial thaw zones in boreal hillslopes enhances potential mobilization of permafrost carbon

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DOI	10.1088/1748-9326/aaf0cc
	Development of perennial thaw zones in boreal hillslopes enhances potential mobilization of permafrost carbon
	Walvoord M.A.; Voss C.I.; Ebel B.A.; Minsley B.J.
发表日期	2019
ISSN	17489318
卷号	14 期号:1
英文摘要	Permafrost thaw alters subsurface flow in boreal regions that in turn influences the magnitude, seasonality, and chemical composition of streamflow. Prediction of these changes is challenged by incomplete knowledge of timing, flowpath depth, and amount of groundwater discharge to streams in response to thaw. One important phenomenon that may affect flow and transport through boreal hillslopes is development of lateral perennial thaw zones (PTZs), the existence of which is here supported by geophysical observations and cryohydrogeologic modeling. Model results link thaw to enhanced and seasonally-extended baseflow, which have implications for mobilization of soluble constituents. Results demonstrate the sensitivity of PTZ development to organic layer thickness and near-surface factors that mediate heat exchange at the atmosphere/ground-surface interface. Study findings suggest that PTZs serve as a detectable precursor to accelerated permafrost degradation. This study provides important contextual insight on a fundamental thermo-hydrologic process that can enhance terrestrial-to-aquatic transfer of permafrost carbon, nitrogen, and mercury previously sequestered in thawing watersheds. © 2019 Not subject to in the USA.
英文关键词	Alaska; boreal; cryohydrogeology; geophysics; permafrost
语种	英语
scopus关键词	Carbon; Geophysics; Groundwater; Permafrost; Alaska; boreal; Chemical compositions; cryohydrogeology; Geophysical observations; Ground water discharge; Incomplete knowledge; Permafrost degradation; Thawing; atmosphere-hydrosphere interaction; baseflow; Boreal; carbon; chemical composition; geophysics; hillslope; hydrogeology; mobilization; permafrost; streamflow; subsurface flow; thawing; watershed; Alaska; United States
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154716
作者单位	U S Geological Survey, Earth System Processes Division, Denver, CO, United States; U S Geological Survey, Earth System Processes Division, Menlo Park, CA, United States; U S Geological Survey, Geology Geophysics, and Geochemistry Science Center, Denver, CO, United States
推荐引用方式 GB/T 7714	Walvoord M.A.,Voss C.I.,Ebel B.A.,et al. Development of perennial thaw zones in boreal hillslopes enhances potential mobilization of permafrost carbon[J],2019,14(1).
APA	Walvoord M.A.,Voss C.I.,Ebel B.A.,&Minsley B.J..(2019).Development of perennial thaw zones in boreal hillslopes enhances potential mobilization of permafrost carbon.Environmental Research Letters,14(1).
MLA	Walvoord M.A.,et al."Development of perennial thaw zones in boreal hillslopes enhances potential mobilization of permafrost carbon".Environmental Research Letters 14.1(2019).