Seasonal Flows on Warm Martian Slopes
Seasonal Flows on Warm Martian Slopes
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DOI：
10.1126/science.1204816
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发表时间：
2011-08-05
期刊：
影响因子：
56.9
通讯作者：
Gulick, Virginia C.
中科院分区：
文献类型：
--
作者：
McEwen, Alfred S.;Ojha, Lujendra;Gulick, Virginia C.
水可能流经古代火星，但今天它是否以液体形式存在于火星表面仍然存在争议。复现坡线 (RSL) 较窄（0.5 至 5 米），在陡峭（25 度至 40 度）的斜坡上颜色相对较暗；火星勘测轨道飞行器高分辨率成像科学实验的重复图像显示，它们在温暖的季节出现并逐渐生长，在寒冷的季节消失。它们从基岩露头向下延伸，通常与小河道相连，在一些罕见的地方形成了数百个。 RSL在南方春末和夏季出现并延长，从南纬48度延伸至南纬32度，有利于面向赤道的斜坡，这些时间和地点的峰值表面温度约为250至300开尔文。地表附近的液态盐水可能可以解释这种活动，但确切的机制和水源尚不清楚。
Water probably flowed across ancient Mars, but whether it ever exists as a liquid on the surface today remains debatable. Recurring slope lineae (RSL) are narrow (0.5 to 5 meters), relatively dark markings on steep (25 degrees to 40 degrees) slopes; repeat images from the Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment show them to appear and incrementally grow during warm seasons and fade in cold seasons. They extend downslope from bedrock outcrops, often associated with small channels, and hundreds of them form in some rare locations. RSL appear and lengthen in the late southern spring and summer from 48 degrees S to 32 degrees S latitudes favoring equator-facing slopes, which are times and places with peak surface temperatures from similar to 250 to 300 kelvin. Liquid brines near the surface might explain this activity, but the exact mechanism and source of water are not understood.