Circular polarization ratio characteristics of impact craters from   Mini-RF observations and implications for ice detection at the polar   regions of the Moon

doi:10.1002/jgre.20110

CORC > 北京大学 > 地球与空间科学学院

	Circular polarization ratio characteristics of impact craters from Mini-RF observations and implications for ice detection at the polar regions of the Moon
	Fa, Wenzhe ; Cai, Yuzhen
刊名	journal of geophysical research planets
	2013
关键词	Moon ice deposits circular polarization ratio surface slope rocks craters LUNAR SOUTH-POLE COHERENT-BACKSCATTER 70-CM WAVELENGTH RADAR ECHOES DEPOSITS ARECIBO MERCURY SURFACE IMAGES WATER
DOI	10.1002/jgre.20110
英文摘要	In an attempt to reduce the ambiguity on radar detection of water ice at the permanently shadowed regions near the lunar poles, radar echo strength and circular polarization ratio (CPR) of impact craters are analyzed using the Miniature Radio Frequency (Mini-RF) radar data from the Lunar Reconnaissance Orbiter mission. Eight typical craters, among over 70 craters, are selected and classified into four categories based on their locations and CPR characteristics: polar anomalous, polar fresh, nonpolar anomalous, and nonpolar fresh. The influences on CPR caused by surface slope, rocks, and dielectric constant are analyzed quantitatively using high-resolution topography data and optical images. A two-component mixed model for CPR that consists of a normal surface and a rocky surface is developed to study the effect of rocks that are perched on lunar surface and buried in regolith. Our analyses show that inner wall of a typical bowl-shaped crater can give rise to a change of about 30 degrees in local incidence angle of radar wave, which can further result in a CPR difference of about 0.2. There is a strong correlation between Mini-RF CPR and rock abundance that is obtained from high-resolution optical images, and predictions from the two-component mixed model match well with the observed CPRs and the estimated rock abundances. Statistical results show that there is almost no apparent difference in CPR characteristics between the polar and nonpolar anomalous craters, or between the polar and nonpolar fresh craters. The enhanced CPR in the interior of anomalous craters is most probably caused by rocks that are perched on lunar surface or buried in regolith, instead of ice deposits as suggested in previous studies.; Geochemistry & Geophysics; SCI(E); 4; ARTICLE; 8; 1582-1608; 118
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155604]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Fa, Wenzhe,Cai, Yuzhen. Circular polarization ratio characteristics of impact craters from Mini-RF observations and implications for ice detection at the polar regions of the Moon[J]. journal of geophysical research planets,2013.
APA	Fa, Wenzhe,&Cai, Yuzhen.(2013).Circular polarization ratio characteristics of impact craters from Mini-RF observations and implications for ice detection at the polar regions of the Moon.journal of geophysical research planets.
MLA	Fa, Wenzhe,et al."Circular polarization ratio characteristics of impact craters from Mini-RF observations and implications for ice detection at the polar regions of the Moon".journal of geophysical research planets (2013).