气候变化领域集成服务门户(CCPortal): Increased rainfall stimulates permafrost thaw across a variety of Interior Alaskan boreal ecosystems

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DOI	10.1038/s41612-020-0130-4
	Increased rainfall stimulates permafrost thaw across a variety of Interior Alaskan boreal ecosystems
	Douglas T.A.; Turetsky M.R.; Koven C.D.
发表日期	2020
ISSN	23973722
卷号	3 期号:1
英文摘要	Earth’s high latitudes are projected to experience warmer and wetter summers in the future but ramifications for soil thermal processes and permafrost thaw are poorly understood. Here we present 2750 end of summer thaw depths representing a range of vegetation characteristics in Interior Alaska measured over a 5 year period. This included the top and third wettest summers in the 91-year record and three summers with precipitation close to mean historical values. Increased rainfall led to deeper thaw across all sites with an increase of 0.7 ± 0.1 cm of thaw per cm of additional rain. Disturbed and wetland sites were the most vulnerable to rain-induced thaw with ~1 cm of surface thaw per additional 1 cm of rain. Permafrost in tussock tundra, mixed forest, and conifer forest was less sensitive to rain-induced thaw. A simple energy budget model yields seasonal thaw values smaller than the linear regression of our measurements but provides a first-order estimate of the role of rain-driven sensible heat fluxes in high-latitude terrestrial permafrost. This study demonstrates substantial permafrost thaw from the projected increasing summer precipitation across most of the Arctic region. © 2020, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
语种	英语
scopus关键词	coniferous forest; mixed forest; permafrost; rainfall; sensible heat flux; terrestrial ecosystem; thawing; tundra; Alaska; Arctic; United States
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178038
作者单位	U.S. Army Cold Regions Research & Engineering Laboratory, Fort Wainwright, AK PO Box 35170, United States; Institute of Arctic and Alpine Research, Ecology and Evolutionary Biology Department, University of Colorado Boulder, Boulder, CO 80303, United States; Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., MS 50-4037, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Douglas T.A.,Turetsky M.R.,Koven C.D.. Increased rainfall stimulates permafrost thaw across a variety of Interior Alaskan boreal ecosystems[J],2020,3(1).
APA	Douglas T.A.,Turetsky M.R.,&Koven C.D..(2020).Increased rainfall stimulates permafrost thaw across a variety of Interior Alaskan boreal ecosystems.npj Climate and Atmospheric Science,3(1).
MLA	Douglas T.A.,et al."Increased rainfall stimulates permafrost thaw across a variety of Interior Alaskan boreal ecosystems".npj Climate and Atmospheric Science 3.1(2020).