论文标题
南极火星的残留季节性水冰斑调查
Survey of remnant seasonal water ice patches at southern polar Mars
论文作者
论文摘要
在火星上，在季节性极性冰盖的衰退之后，由于火星表面和大气的导热率低，在阴暗的地方留下了小的冰冷斑块，在夏季在夏天直接阳光。这些斑块可能会大大变热，我们在下面分析了这些地方如何在这些地方出现液相，从而调查了Hirise图像。分析了符合位置和季节选择标准的730张图像，我们确定了148张图像，上面有较小的冰块。它们与其他明亮的斑块（例如云或较浅的层阴影和岩石）的分离是可以通过其蓝色和与当地地形阴影的牢固联系而分开的。这些区域的范围在-40°和-60°之间的纬度带中的140°和200°太阳经度之间。冰斑的直径在1.5-300米之间，即使在季节性极性盖在19-133火星时期的持续时间范围内，它们仍在地面上。 在火星气候数据库（MCD）的帮助下，我们模拟了表面温度，并预测了22个分析区域的CO2和H2O冰盖。从模型来看，中午温度未达到水的熔点，即273 K，因此宏观尺度上的液态水的发生极不可能，但是可能会形成分层和水冰之间的冰（一些纳米层较厚的冰）冰（几种纳米层厚的水衣）。
On Mars it is possible that after the recession of the seasonal polar ice cap, small icy patches left behind in shady places due to the low thermal conductivity of the Martian surface and atmosphere, are met by direct sunlight during the summer. These patches might warm up substantially and we analyzed below how could a liquid phase emerge in these places, surveying HiRISE images. 730 images that fit the selection criteria of location and season were analyzed, and we identified 148 images with smaller ice patches on them. Their separation from other bright patches, like clouds or lighter shades of layers and rocks were possible by their bluish color and strong connection to local topographic shading. These areas range between 140° and 200° solar longitude in the latitude band between -40° and -60°. The diameter of the ice patches ranges between 1.5-300 meters, and they remain on the surface even after the seasonal polar cap has passed over the area for the duration range of 19-133 martian days. With the help of The Mars Climate Database (MCD) we simulated the surface temperature and predicted CO2 and H2O ice cover at 22 analyzed areas. Judging by the models, the average noon temperature does not reach the melting point of water, which is 273 K, therefore the occurrence of liquid water on the macroscopic scale is highly unlikely, however there is a possibility that an interfacial premelting of ice (a few nanometers thick waterlayer) might form between the layered and the water ice.
