The changing nature of rainfall during the early history of Mars
The changing nature of rainfall during the early history of Mars
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DOI：
10.1016/j.icarus.2017.04.013
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发表时间：
2017-09-01
期刊：
影响因子：
3.2
通讯作者：
Lorenz, Ralph D.
中科院分区：
文献类型：
--
作者：
Craddock, Robert A.;Lorenz, Ralph D.
对于地质过程中的时间差异，已经提出了几种解释，这些地质过程与整个诺亚纪发生的火星撞击坑的修改以及诺亚纪/赫斯珀纪过渡期间发生的山谷网络的形成有关。在这里，我们表明，这可能是由于降雨性质的变化，因为火星上的原始大气压力随着时间的推移而减弱。我们计算了直径大于0.5 mm的雨滴的最终速度和由此产生的动能，这些雨滴将在富含二氧化碳的大气中撞击火星表面，压力范围从0.5到10巴。我们的分析表明，火星的原始大气不可能超过4.0巴，因为雨滴的大小将被限制在
Several explanations have been proposed for the temporal differences in geologic processes associated with the modification of martian impact craters, which occurred throughout the Noachian, and the formation of valley networks, which occurred during the Noachian/Hesperian transition. Here we show that it could be a result of the changing nature of rainfall as the primordial atmospheric pressure on Mars waned through time. We calculate the terminal velocity and resulting kinetic energy from raindrops > 0.5 mm in diameter that would impact the surface of Mars in a CO2-rich atmosphere ranging in pressure from 0.5 to 10 bars. Our analyses indicate that the primordial atmosphere of Mars could not have exceeded similar to 4.0 bars as raindrop sizes would have been limited to