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首页> 外文期刊>Geophysical Research Letters >Dust Storm-Enhanced Gravity Wave Activity in the Martian Thermosphere Observed by MAVEN and Implication for Atmospheric Escape
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Dust Storm-Enhanced Gravity Wave Activity in the Martian Thermosphere Observed by MAVEN and Implication for Atmospheric Escape

机译：Maven观察到的Martian Thermophere中的尘埃风暴增强的重力波动，对大气逃逸的影响

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摘要

Lower atmospheric global dust storms affect the small- and large-scale weather and variability of the whole Martian atmosphere. Analysis of the CO2 density data from the Neutral Gas and Ion Mass Spectrometer instrument on board NASA's Mars Atmosphere Volatile EvolutioN (MAVEN) spacecraft show a remarkable increase of gravity wave (GW)-induced density fluctuations in the thermosphere during the 2018 major dust storm with distinct latitude and local time variability. The mean thermospheric GW activity increases by a factor of two during the storm event. The magnitude of relative density perturbations is around 20% on average and 40% locally. One and a half months later, the GW activity gradually decreases. Enhanced temperature disturbances in the Martian thermosphere can facilitate atmospheric escape. For the first time, we estimate observationally that, for a 20% and 40% GW-induced disturbances, the net increase of Jeans escape flux of hydrogen is a factor of 1.3 and 2, respectively.
机译：低层大气全球沙尘暴影响整个火星大气的小尺度和大尺度天气和变化。对NASA火星大气挥发性演化（MAVEN）航天器上中性气体和离子质谱仪的CO2密度数据的分析表明，在2018年大沙尘暴期间，重力波（GW）引起的热层密度波动显著增加，具有明显的纬度和局部时变性。风暴期间，平均热层GW活动增加了两倍。相对密度扰动的大小平均约为20%，局部约为40%。一个半月后，GW活动逐渐减少。火星热层中增强的温度扰动可以促进大气逃逸。我们首次从观测上估计，对于20%和40%的GW诱导扰动，氢气逃逸通量的净增加分别为1.3和2倍。

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