Seasonal and secular variation of wind streaks on Mars - An analysis of Mariner 9 and Viking data
Seasonal and secular variation of wind streaks on Mars - An analysis of Mariner 9 and Viking data
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火星上风条纹的季节性和长期变化 - 对水手 9 号和维京号数据的分析
DOI：
10.1029/jb084ib14p08131
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发表时间：
1979
影响因子：
--
通讯作者：
J. Veverka
中科院分区：
文献类型：
--
作者：
P. Thomas;J. Veverka
维京海盗号轨道飞行器在一个火星年内的观测资料已被用来与水手9号在1971-1972年获得的资料相结合，以研究几种风条纹的季节性和长期行为。大多数明亮的条纹，推断是由障碍物的尘埃风暴沉降物组成的，在3个火星年的时间里，它们的形状或方向几乎没有变化。有些非常稳定，在3年内没有经历过有效的风成作用。一些明亮的条纹在全球沙尘暴期间迅速变化;这些条纹位于受全球风和地形风影响的地区。维京海盗号的图像首次显示，黑色的侵蚀条纹从大沙尘暴后形成的时间到下一次大风暴活动的开始都是稳定的。现有的证据表明，奥夏Palus中的大而暗的条纹由相关陨石坑内沙丘区域的物质组成。自1972年以来，这些条纹长期延长;变化似乎发生在南方夏季。绝大多数的条纹反映了从南部晚春到南部初秋的风，尽管全年都会发生一些变化。因此，风纹的全球模式和风纹的变异性在很大程度上取决于火星上目前南北季节的不对称性。
Viking orbiter observations extending over 1 Martian year have been used in conjunction with Mariner 9 data obtained in 1971-1972 to study the seasonal and secular behavior of several kinds of wind streaks. Most bright streaks, inferred to consist of dust storm fallout in the lees of obstacles, have changed very little in form or orientation over a period of 3 Martian years. Some are extremely stable and have experienced no effective eolian action over the 3 years. A few bright streaks changed rapidly during global dust storms; these streaks are located in areas subject to both global and topographic winds. Viking images have shown for the first time that dark, erosional streaks are stable from the time of their formation after major dust storms until the onset of the next episode of major storm activity. Available evidence shows that the large, dark streaks in Oxia Palus consist of material deflated from dune fields within the associated craters. These streaks lengthened secularly since 1972; changes appear to occur episodically during southern summer. The great majority of all streaks reflect winds during the period from late southern spring to early southern fall, although some changes occur throughout the year. The global pattern of wind streaks and the variability of the streaks thus depend strongly upon the current south-north asymmetry of seasons on Mars.