Similarities and Differences of Global Dust Storms in MY 25, 28, and 34
Similarities and Differences of Global Dust Storms in MY 25, 28, and 34
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25、28、34年全球沙尘暴的异同
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
M. Amoroso
中科院分区：
文献类型：
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作者：
P. Wolkenberg;M. Giuranna;M. Smith;D. Grassi;M. Amoroso
为了更好地了解沙尘暴环绕火星期间火星上的尘埃循环，我们分析了火星年（MY） 25、MY 28和MY 34发生的最后三次事件。2018年6月25日和34日的全球沙尘暴发生在春分期间，而28日的沙尘暴发生在近日点之后。在m25和m34风暴扩展阶段之前，我们发现类似的区域（Hellas， Arabia Terra和Utopia Planitia的北部边缘）存在尘埃。在me28期间观测到希腊和南极帽边缘可能的前兆沙尘暴，作为背景尘埃活动的一个组成部分。这些特征在这种尺度的春分沙尘暴中是没有的。m25和m34风暴期间的尘埃在相似的季节（Ls = 193°）包围了整个行星。与mi25和mi28相比，mi34风暴的衰减期更短。沙尘不透明度与0.5 mbar的大气温度和夜间地表温度相关，而白天地表温度与沙尘不透明度不相关。
To better understand the dust cycle on Mars during years with planet‐encircling dust storms, we analyze the last three events that took place in Mars Year (MY) 25, MY 28, and MY 34. Global dust storms that occurred in MY 25 and MY 34 (June 2018) were taking place during equinox, while the MY 28 storm had an onset after perihelion. Before the expansion phase of the MY 25 and MY 34 storms, we find similar regions (northern rim of Hellas, Arabia Terra, and Utopia Planitia) where dust is present. Possible precursor dust storms over Hellas and the southern polar cap edges were observed during MY 28 as a component of background dust activity. These features are not found in equinoctial dust storms on this scale. Dust during the MY 25 and MY 34 storms encircled the entire planet by the similar season (Ls = 193°). The MY 34 storm is characterized by a shorter decay phase compared to the events in MY 25 and MY 28. Dust opacity is correlated with atmospheric temperatures at 0.5 mbar and nighttime surface temperatures, while daytime surface temperatures are anticorrelated with dust opacity.