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Glaciers, loosely defined as patches of currently or recently flowing ice, are thought to be present across large but restricted areas of the modern Martian surface, and are inferred to have been more widely distributed at times in the past. Lobate convex features on the surface known as viscous flow features and lobate debris aprons, which show the characteristics of non-Newtonian flow, are now almost unanimously regarded as true glaciers.

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  • الأنهار الجليدية على المريخ (ar)
  • Glaciers on Mars (en)
  • 冰川 (火星) (zh)
rdfs:comment
  • يُعتقد أن الأنهار الجليدية، التي تُعرف بشكل عام على أنها بقع من الجليد المتدفق حاليًا أو مؤخرًا، موجودة عبر مناطق كبيرة لكن محدودة على سطح المريخ الحديث، ويُستدل على أنها كانت موزعةً على نطاق واسع في الماضي. تُعتبر السمات المحدبة الفصية على سطح المريخ المعروفة باسم ميزات التدفق اللزج ومناطق الحطام الفصية، التي تتميز بخصائص التدفق غير النيوتوني، أنهارًا جليدية حقيقية. (ar)
  • Glaciers, loosely defined as patches of currently or recently flowing ice, are thought to be present across large but restricted areas of the modern Martian surface, and are inferred to have been more widely distributed at times in the past. Lobate convex features on the surface known as viscous flow features and lobate debris aprons, which show the characteristics of non-Newtonian flow, are now almost unanimously regarded as true glaciers. (en)
  • 冰川,宽泛地定义为当前或最近流动的积冰,被认为存在于现代火星表面大片特定的区域,并推断在过去某些时候曾可能分布得更广。地表上凸起的叶状特征,即显示出非牛顿流特征的粘性流体和舌状岩屑坡,现在几乎被一致认为是真正的冰川。 然而,地表上的其他各种特征如锐蚀地形、线状谷底沉积、同心坑沉积和弧岭等也被解释为与冰流动直接有关,而在中纬度和极地地区图像中所看到的各种表面纹理也认为与冰川升华有关系。 如今,被解释为冰川的地貌主要仅限于纬度约30度的极向纬度带,在伊斯墨诺斯湖区发现了特别的丰度。根据目前的火星大气模型,水冰如暴露在火星中纬度地表,应该是不稳定的。因此,人们认为大多数冰川必须覆盖一层碎石或尘埃,以阻止水蒸气从升华的冰层中自由转移到空气中。这也表明,在最近的地质史中,火星气候一定有所不同,才能让冰川在这些纬度稳定增长。这也提供了表明过去火星倾角发生过重大变化的有利证据,这一点可通过火星轨道建模得到独立证明。过去冰川作用的证据也出现在热带地区数座火星火山的山峰上。 (zh)
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