气候变化领域集成服务门户(CCPortal): Rapid initialization of retrogressive thaw slumps in the Canadian high Arctic and their response to climate and terrain factors

CCPortal

DOI	10.1088/1748-9326/ab12fd
	Rapid initialization of retrogressive thaw slumps in the Canadian high Arctic and their response to climate and terrain factors
	Ward Jones M.K.; Pollard W.H.; Jones B.M.
发表日期	2019
ISSN	17489318
卷号	14 期号:5
英文摘要	An increase in retrogressive thaw slump (RTS) activity has been observed in the Arctic in recent decades. However, a gap exists between observations in high Arctic polar desert regions where mean annual ground temperatures are as cold as -16.5 °C and vegetation coverage is sparse. In this study, we present a ∼30 year record of annual RTS observations (frequency and distribution) from 1989 to 2018 within the Eureka Sound Lowlands, Ellesmere and Axel Heiberg Islands. Record summer warmth in 2011 and 2012 promoted rapid RTS initialization, increasing active slumps from 100 in a given year or less to over 200 regionally and promoting RTS initiation in previously unaffected terrain. Differential GPS and remote sensing observations of 12 RTSs initiated during this period (2011-2018) provided a mean headwall retreat rate for all RTSs of 6.2 m yr-1 and for specific RTSs up to 26.7 m yr-1. To better understand the dynamics of climate and terrain factors controlling RTS headwall retreat rates we explored RTS interactions by correlating headwall retreat with climate factors (thawing degree days, annual rainfall and annual snowfall) and terrain factors (aspect and slope). Our findings indicate a sensitivity of cold permafrost in the high Arctic to climate-driven thermokarst initiation, but the decoupling of RTS dynamics from climate appears to occur over time for individual RTS as terrain factors take on a greater role controlling headwall retreat. Detailed observations of thermokarst development in a high Arctic polar desert permafrost setting are important as it demonstrates the sensitivity of this system to changes in summer temperatures and highlight differences to changes occurring in other Arctic permafrost regions. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	climate change; Eureka sound lowlands; high arctic; landscape change; permafrost; retrogressive thaw slumps; thermokarst
语种	英语
scopus关键词	Landforms; Permafrost; Remote sensing; Thawing; Eureka sound lowlands; High arctic; Landscape changes; Thaw slump; thermokarst; Climate change; climate change; desert; GPS; landscape change; permafrost; polar region; remote sensing; seasonal variation; thermokarst; vegetation cover; Arctic; Canada; Canadian Arctic
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/154574
作者单位	Department of Geography, McGill University, Montreal, Canada; Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, United States
推荐引用方式 GB/T 7714	Ward Jones M.K.,Pollard W.H.,Jones B.M.. Rapid initialization of retrogressive thaw slumps in the Canadian high Arctic and their response to climate and terrain factors[J],2019,14(5).
APA	Ward Jones M.K.,Pollard W.H.,&Jones B.M..(2019).Rapid initialization of retrogressive thaw slumps in the Canadian high Arctic and their response to climate and terrain factors.Environmental Research Letters,14(5).
MLA	Ward Jones M.K.,et al."Rapid initialization of retrogressive thaw slumps in the Canadian high Arctic and their response to climate and terrain factors".Environmental Research Letters 14.5(2019).