Chaotic obliquity and the nature of the Martian climate
Chaotic obliquity and the nature of the Martian climate
复制标题
混沌倾角和火星气候的本质
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
M. Mellon
中科院分区：
文献类型：
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作者：
B. Jakosky;B. Henderson;M. Mellon
最近对火星倾斜度的计算表明，它在超过107年的时间尺度上混乱地变化，并且在0 °和60°之间变化。我们研究了在40 °和60°之间的湿度下的季节性水行为。每年有几十厘米的水从极冠升华，并可能移动到赤道，在那里它更稳定。CO2霜和CO2-H2O笼形水合物在几十米深以下的极地沉积物中是稳定的，因此极盖可能含有重要的CO2储层。如果存在二氧化碳，它可能是火星早期历史遗留下来的;而且，它可能在高湿度时期释放到大气中，导致偶尔的更潮湿的气候。
Recent calculations of the Martian obliquity suggest that it varies chaotically on timescales longer than about 107 years and varies between about 0 and 60°. We examine the seasonal water behavior at obliquities between 40 and 60°. Up to several tens of centimeters of water may sublime from the polar caps each year, and possibly move to the equator, where it is more stable. CO2 frost and CO2-H2O clathrate hydrate are stable in the polar deposits below a few tens of meters depth, so that the polar cap could contain a significant CO2 reservoir. If CO2 is present, it could be left over from the early history of Mars; also, it could be released into the atmosphere during periods of high obliquity, causing occasional periods of more-clement climate.