气候变化领域集成服务门户(CCPortal): Changes in Soil Cohesion Due to Water Vapor Exchange: A Proposed Dry-Flow Trigger Mechanism for Recurring Slope Lineae on Mars

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DOI	10.1029/2020GL087618
	Changes in Soil Cohesion Due to Water Vapor Exchange: A Proposed Dry-Flow Trigger Mechanism for Recurring Slope Lineae on Mars
	Gough R.V.; Nuding D.L.; Archer P.D.; Jr.; Fernanders M.S.; Guzewich S.D.; Tolbert M.A.; Toigo A.D.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:11
英文摘要	Recurring slope lineae (RSL) are seasonal flows on steep slopes on Mars. Their formation mechanism is unknown, but dry granular flows are a likely explanation. Any proposed trigger for these flows must be consistent with the observed temperature dependence of RSL: more active in warmer months or when sun-facing. Here, we use atmospheric modeling and laboratory experiments to explore a potential mechanism that involves both wet and dry processes at Hale Crater, a known RSL location. We propose that dry flows are triggered by changes in soil cohesion due to the loss of water. When surface temperature and humidity were experimentally simulated, salts likely found in the soil only completely dehydrated during the active season for RSL. We propose that the loss of water from soil in warmer months (or when illuminated) lowers soil cohesion and maximum stability angle. Slope failure may occur, exposing darker underlying material and creating RSL. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atmospheric humidity; Shotcreting; Temperature distribution; Dry granular flows; Formation mechanism; Laboratory experiments; Potential mechanism; Surface temperatures; Temperature dependence; Water-vapor exchange; Wet and dry process; Soils; atmospheric modeling; cohesive soil; granular medium; laboratory method; Mars; relative humidity; slope; soil temperature; water vapor
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/170283
作者单位	Cooperative Institute for Research in Environmental Sciences and Department of Chemistry, University of Colorado, Boulder, CO, United States; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States; Jacobs, NASA Johnson Space Center, Houston, TX, United States; NASA-Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Gough R.V.,Nuding D.L.,Archer P.D.,et al. Changes in Soil Cohesion Due to Water Vapor Exchange: A Proposed Dry-Flow Trigger Mechanism for Recurring Slope Lineae on Mars[J],2020,47(11).
APA	Gough R.V..,Nuding D.L..,Archer P.D..,Jr..,Fernanders M.S..,...&Toigo A.D..(2020).Changes in Soil Cohesion Due to Water Vapor Exchange: A Proposed Dry-Flow Trigger Mechanism for Recurring Slope Lineae on Mars.Geophysical Research Letters,47(11).
MLA	Gough R.V.,et al."Changes in Soil Cohesion Due to Water Vapor Exchange: A Proposed Dry-Flow Trigger Mechanism for Recurring Slope Lineae on Mars".Geophysical Research Letters 47.11(2020).