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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Seasonal Variability of Deuterium in the Upper Atmosphere of Mars
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Seasonal Variability of Deuterium in the Upper Atmosphere of Mars

机译:氘的季节性变化上火星大气

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摘要

Measurements by multiple Mars Atmosphere and Volatile Evolution mission instruments, obtained between November 2014 and November 2017, are analyzed to produce deuterium properties in the upper atmosphere of Mars. We show here, for the first time, the seasonal distribution and variability of D densities, temperatures, and estimated Jeans escape rates at the exobase (200 km). Within the data constraints, it is found that the variations in D properties are similar for the northern and southern hemispheres, and peak near southern summer solstice. Trends in the D Lyman-α brightness, temperature, density, and escape rate are increasing during the beginning of the dust storm season, peak near southern summer solstice, and decrease toward the end of the dust storm season. This suggests that seasonal drivers at Mars cause deuterium in the upper atmosphere to become globally enhanced when Mars is closest to the Sun and during the Martian dust season when water is provided to the upper atmosphere by subsurface, hydrological, and dust storm dynamics.
机译:由多个火星大气和测量挥发性进化任务工具,2014年11月至2017年11月,分析了产生氘属性火星高层大气。第一次,季节性分布和可变性的D密度、温度和在范围内(200年估计牛仔裤逃逸率公里)。D属性的变化是相似的北半球和南半球,夏至南部峰值附近。D莱曼-α亮度、温度、密度、和在开始逃跑率正在增加沙尘暴的季节,峰值附近的南部夏至,减少快结束的时候沙尘暴季节。季节性的司机在火星引起氘高层大气成为全球增强时火星是离太阳和火星尘埃赛季当水提供给上层气氛由地下、水文和灰尘风暴动力学。

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