Surface Dust Redistribution on Mars From Interannual Differences in Temperature and Albedo
Surface Dust Redistribution on Mars From Interannual Differences in Temperature and Albedo
复制标题
温度和反照率的年际差异导致火星表面尘埃重新分布
DOI：
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
A. Kleinböhl
中科院分区：
文献类型：
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作者：
J. Bapst;S. Piqueux;C. Edwards;C. Wolfe;P. Hayne;D. Kass;A. Kleinböhl
火星目前的气候不时被反复出现的沙尘暴事件所打断，沙尘从火星表面升起并被大气层输送。灰尘的添加或去除会使表面变亮或变暗，并且由于其导热率低而影响隔热性能。特别令人感兴趣的是全球沙尘暴（GDS）的复发，以及它们的频率是否由事件之间有限的表面水库的补充或耗尽控制。全球气候模型预测了全球风暴前后沙尘覆盖的变化，但输出的沙尘数量和位置有很大差异。对全球多年地表温度观测结果和从轨道观测到的尘埃进行分析，可以限制尘埃覆盖范围和（或）厚度的变化。我们计算并绘制了从火星年（MY）24到MY35的表面温度的年际差异，以确定尘埃重新分布的区域。整个MY25 GDS的区域温度变化可以通过温度的变化来解释，并且不需要表面热特性的变化，支持极小的尘埃厚度变化。在MY34 GDS中，我们发现表面温度的变化范围较小，这表明与MY25相比，对灰尘再分布的影响较小。然而，我们确定了Acidalia和Arabia Terra之间的一个区域，该区域经历了大量的除尘，并与可见的高分辨率轨道图像呈正相关。我们的工作支持观测到的GDS尘埃厚度的微小变化，并且与至少103年的时间尺度上的有效无限尘埃库一致。
The present climate of Mars is punctuated by recurring dust storm events, where dust is lifted from the surface and is transported by the atmosphere. Dust addition or removal can brighten or darken the surface, as well as affect thermal insulating properties because of its low thermal conductivity. Of particular interest is the recurrence of global dust storms (GDSs) and whether their frequency is controlled by the replenishment or depletion of finite surface reservoirs between events. Global climate models predict changes in dust coverage before and after global storms, but output varies substantially regarding the amounts and locations of transported dust. The analysis of global, multiyear observations of surface temperature and albedo from orbit can constrain changes in dust coverage and/or thickness. We calculate and map interannual differences in surface temperature from Mars Year (MY) 24 through MY35 to identify regions of dust redistribution. Regional temperature changes across the MY25 GDS can be explained by changes in albedo and do not require changes in surface thermal properties, supporting extremely small dust thickness changes. Across the MY34 GDS, we find less extensive changes in surface temperature, indicating a reduced impact on dust redistribution compared to MY25. However, we identify a region between Acidalia and Arabia Terra that experienced substantial dust removal and positively correlates with visible high‐resolution orbital images. Our work supports minuscule changes in dust thickness from the observed GDSs and is consistent with effectively infinite dust reservoirs on timescales of at least 103 years.
火星气候探测仪肢体轮廓检索大气温度、压力、灰尘和水冰不透明度
DOI：
10.1029/2009je003358
发表时间：
2009
期刊：
Planets
影响因子：
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作者：
Kleinböhl A
通讯作者：
Kleinböhl A