Sublimation of the Martian CO(2) Seasonal South Polar Cap

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50781

Title:	Sublimation of the Martian CO(2) Seasonal South Polar Cap
Authors:	Schmidt,F;Schmitt,B;Doute,S;Forget,F;Jian,JJ;Martin,P;Langevin,Y;Bibring,JP
Contributors:	天文研究所
Keywords:	GENERAL-CIRCULATION;VIKING OBSERVATIONS;CRYPTIC REGIONS;ICE CAP;MARS;ATMOSPHERE;SURFACE;ALBEDO;MODEL;SIMULATIONS
Date:	2010
Issue Date:	2012-03-27 18:10:03 (UTC+8)
Publisher:	國立中央大學
Abstract:	The polar condensation/sublimation of CO(2), that involve about one fourth of the atmosphere mass, is the major Martian climatic cycle. Early observations in visible and thermal infrared have shown that the sublimation of the Seasonal South Polar Cap (SSPC) is not symmetric around the geographic South Pole. Here we use observations by OMEGA/Mars Express in the near-infrared to detect unambiguously the presence of CO(2) at the surface, and to estimate albedo. Second, we estimate the sublimation of CO(2) released in the atmosphere and show that there is a two-step process. From Ls = 180 degrees to 220 degrees, the sublimation is nearly symmetric with a slight advantage for the cryptic region. After Ls = 220 degrees the anti-cryptic region sublimation is stronger. Those two phases are not balanced such that there is 22% +/- 9 more mass the anti-cryptic region, arguing for more snow precipitation. We compare those results with the MOLA height measurements. Finally we discuss implications for the Martian atmosphere about general circulation and gas tracers, e.g. Ar. (C) 2010 Elsevier Ltd. All rights reserved.
Relation:	PLANETARY AND SPACE SCIENCE
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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