DOI: 10.1002/2017JE005500
Scopus记录号: 2-s2.0-85042540147
论文题名: Investigating Mercury's South Polar Deposits: Arecibo Radar Observations and High-Resolution Determination of Illumination Conditions
作者: Chabot N.L. ; Shread E.E. ; Harmon J.K.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 2 起始页码: 666
结束页码: 681
语种: 英语
英文关键词: ice
; Mercury
; MESSENGER
; permanent shadow
; poles
; radar
Scopus关键词: ice
; image resolution
; Mercury (planet)
; polar region
; radar imagery
; spatial resolution
英文摘要: There is strong evidence that Mercury's polar deposits are water ice hosted in permanently shadowed regions. In this study, we present new Arecibo radar observations of Mercury's south pole, which reveal numerous radar-bright deposits and substantially increase the radar imaging coverage. We also use images from MESSENGER's full mission to determine the illumination conditions of Mercury's south polar region at the same spatial resolution as the north polar region, enabling comparisons between the two poles. The area of radar-bright deposits in Mercury's south is roughly double that found in the north, consistent with the larger permanently shadowed area in the older, cratered terrain at the south relative to the younger smooth plains at the north. Radar-bright features are strongly associated with regions of permanent shadow at both poles, consistent with water ice being the dominant component of the deposits. However, both of Mercury's polar regions show that roughly 50% of permanently shadowed regions lack radar-bright deposits, despite some of these locations having thermal environments that are conducive to the presence of water ice. The observed uneven distribution of water ice among Mercury's polar cold traps may suggest that the source of Mercury's water ice was not a steady, regular process but rather that the source was an episodic event, such as a recent, large impact on the innermost planet. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114520
Appears in Collections: 气候减缓与适应
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作者单位: Johns Hopkins Applied Physics Laboratory, Laurel, MD, United States; National Astronomy and Ionosphere Center, Arecibo Observatory, Arecibo, Puerto Rico
Recommended Citation:
Chabot N.L.,Shread E.E.,Harmon J.K.. Investigating Mercury's South Polar Deposits: Arecibo Radar Observations and High-Resolution Determination of Illumination Conditions[J]. Journal of Geophysical Research: Planets,2018-01-01,123(2)