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Surface dust redistribution on Mars as observed by the Mars Global Surveyor and Viking orbiters

机译:火星全球测量师和维京轨道器观测到的火星表面尘埃再分布

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摘要

The variation of surface dust coverage on Mars is mapped using Mars Global Surveyor (MGS) and Viking albedo data. Albedo is shown to correlate well with spectrally derived measurements of surface dust abundance and is subsequently used to gauge dust coverage. Atmospheric aerosols modify the albedo observed from orbit, complicating this analysis. However, opacity cycles are highly repeatable, and simultaneous, independent records of aerosol opacities are available to isolate their impact. The MGS albedo and imaging data contain global coverage on a daily basis, allowing the relationship between dust cover and specific meteorological events to be elucidated. The 2001 global dust storm produced the largest changes in surface dust coverage during the MGS mission. Other processes yielding significant changes include seasonal cap-edge winds, seasonally varying regional winds, local/regional dust storms, and extratropical cyclones.
机译:使用火星全球测量师(MGS)和维京反照率数据绘制火星表面尘埃覆盖率的变化图。反照率与表面尘埃丰度的光谱测量结果显示出良好的相关性,随后被用于衡量尘埃覆盖率。大气气溶胶会改变从轨道观测到的反照率,使这一分析复杂化。但是,不透明度循环具有很高的可重复性,并且可以同时获得独立的气雾不透明度记录来隔离其影响。 MGS的反照率和成像数据每天都包含全球覆盖范围,因此可以阐明尘埃覆盖与特定气象事件之间的关系。在MGS任务期间,2001年的全球沙尘暴使地面灰尘覆盖率发生了最大变化。产生重大变化的其他过程包括季节性的边缘风,季节性变化的区域风,局部/区域沙尘暴和温带气旋。

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