气候变化领域集成服务门户(CCPortal): Conceptual Model for the Removal of Cold-Trapped H2O Ice on the Mars Northern Seasonal Springtime Polar Cap

CCPortal

DOI	10.1029/2020GL087387
	Conceptual Model for the Removal of Cold-Trapped H2O Ice on the Mars Northern Seasonal Springtime Polar Cap
	Titus T.N.; Williams K.E.; Cushing G.E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	The transport of H2O ice along the retreating north polar seasonal CO2 ice cap has previously been modeled and observed. Spectral observations show that H2O ice forms on the interior of the seasonal cap, while thermal observations show these regions to be consistent with CO2 ice. Prior to the sublimation of the seasonal CO2, the observed H2O ice deposits are diminished—and because H2O ice sublimation rates are extremely slow while in direct thermal contact with CO2 ice, an alternate removal process must be operating. We propose a model where the process of removing these H2O deposits starts with insolation-induced basal sublimation of the underlying CO2 ice. This sublimed gas would “seep” upward and into the interface between the two ices, increasing pressure until the gas pressure fractures the cold-trapped H2O ice. Small fragments would be suspended while larger fragments would be pushed aside, exposing the underlying CO2 ice. Published 2020. This article is a U.S. Government work and is in the public domain in the USA.
英文关键词	Carbon dioxide; Deposits; Phase interfaces; Sublimation; Conceptual model; Gas pressures; Ice deposit; Ice sublimation; Public domains; Removal process; Spectral observations; Thermal contact; Ice; carbon dioxide; ice cap; Mars; model; spring (season); sublimation
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/170038
作者单位	U.S. Geological Survey Astrogeology Science Center, Flagstaff, AZ, United States
推荐引用方式 GB/T 7714	Titus T.N.,Williams K.E.,Cushing G.E.. Conceptual Model for the Removal of Cold-Trapped H2O Ice on the Mars Northern Seasonal Springtime Polar Cap[J],2020,47(15).
APA	Titus T.N.,Williams K.E.,&Cushing G.E..(2020).Conceptual Model for the Removal of Cold-Trapped H2O Ice on the Mars Northern Seasonal Springtime Polar Cap.Geophysical Research Letters,47(15).
MLA	Titus T.N.,et al."Conceptual Model for the Removal of Cold-Trapped H2O Ice on the Mars Northern Seasonal Springtime Polar Cap".Geophysical Research Letters 47.15(2020).