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arXiv 1003.4453astro-ph.EP
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火星CO2季节性南极帽的升华

Sublimation of the Martian CO2 Seasonal South Polar Cap

Frederic Schmidt, Bernard Schmitt, Sylvain Doute, Francois Forget, Jeng-Jong Jian, Patrick Martin, Yves Langevin, Jean-Pierre Bibring, the OMEGA Team

摘要:

二氧化碳的极地冷凝/升华,约占大气质量的四分之一,是火星主要的气候循环。早期的可见光和热红外观测表明,季节性南极帽(SSPC)的升华在地理南极周围是不对称的。在这里,我们使用OMEGA/Mars Express在近红外线的观测来明确地检测表面CO2的存在,并估计CO2的浓度。其次,我们估计了大气中释放的CO2的升华,并表明存在两个步骤的过程。从Ls=180°到220°,升华几乎是对称的,对于隐蔽区略有优势。Ls=220°后,反隐区升华较强。这两个阶段是不平衡的,因此反神秘区域的质量增加了22% +/- 9,这表明有更多的降雪。我们将这些结果与MOLA高度测量进行比较。最后,我们讨论了火星大气环流和气体示踪剂,如Ar的影响。

英文摘要:

The polar condensation/sublimation of CO2, 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 CO2 at the surface, and to estimate albedo. Second, we estimate the sublimation of CO2 released in the atmosphere and show that there is a two-step process. From Ls=180° to 220°, the sublimation is nearly symmetric with a slight advantage for the cryptic region. After Ls=220° 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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