Viking‐era diurnal water‐ice clouds
Viking‐era diurnal water‐ice clouds
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维京时代的昼夜水冰云
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
D. Paige
中科院分区：
文献类型：
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作者：
L. Tamppari;R. Zurek;D. Paige
[1]维京海盗时代的水冰云被绘制成季节、纬度、经度和一天中的时间的函数。在有数据可查的春季半球，观测到云从早晨到中午减少。据观察，它们的范围从中午到下午增加，可能是由于大气温度升高导致尘埃上升，然后作为云凝结核。在夏季，观察到半球云层的范围全天减少，这表明足够的变暖可以防止水达到凝结水平。Hadley环流上升流分支在北方和南半球的春季和夏季通过云带出现。在北北方夏末和北方初秋，向北纬60°赤道方向延伸的云主要出现在Acidalia Planitia纵向扇区，可能表明北极罩的最南端或与风暴有关的云。水冰云与地形特征相关，包括奥林匹斯山，塔尔西斯火山和希腊盆地的北方边缘。几乎没有证据表明突出的云特征存在年际变化（例如，远日点云带），因为它们在两个火星年都存在，尽管详细的结构确实发生了变化。
[1] Water-ice clouds during the Viking era are mapped as a function of season, latitude, longitude, and time of day. In the springtime hemisphere, where data are available, clouds are observed to decrease from morning to midday. They are observed to increase in extent from midday to afternoon, possibly due to increased atmospheric temperatures causing uplifting of dust which then acts as cloud condensation nuclei. During the summer hemisphere clouds are observed to decrease in extent throughout the day, indicating sufficient warming to prevent water reaching the condensation level. The Hadley cell upwelling branch is seen throughout the year via cloud belts in both the northern (aphelion cloud belt) and southern hemispheres in their respective springs and summers. Clouds extending equatorward of 60°N in late northern summer and early northern autumn are seen primarily over the Acidalia Planitia longitudinal sector and may indicate the southernmost extent of the north polar hood or clouds associated with storms. Water-ice clouds associated with topographic features are seen, including Olympus Mons, the Tharsis volcanoes, and the northern rim of Hellas basin. There is little evidence for interannual variability in the prominent cloud features (e.g., the aphelion cloud belt) since they are present in both Martian years examined, though the detailed structure does change.