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Oceans in the past history of Mars: Tests for their presence using Mars Orbiter Laser Altimeter (MOLA) data

机译:过去火星历史中的海洋:使用火星轨道激光高度计(MOLA)数据测试其存在

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An ancient north polar ocean on Mars has been proposed [Parker et al., 1989] and we use MOLA data to test the hypothesis. Of the two proposed contacts/shorelines, the younger Contact 2 shows the closest approximation to an equipotential surface; vertical variations along this surface occur in areas with post-contact-formation geological activity or suspected changes in the position of an equipotential surface (e.g., Tharsis) with time. The surface of Mars is smoother at all scales below Contact 2 than above. The volume of the region below Contact 2 (similar to 1.5 x 10(7) km(3)) is between the minimum estimated total outflow channel discharge and the maximum estimated megaregolith pore space. These results are consistent with the hypothesis that a large standing body of water occupied the northern lowlands in the past history of Mars. [References: 13]
机译:已经提出了火星上一个古老的北极海洋[Parker et al。,1989],我们使用MOLA数据来检验该假设。在建议的两个接触/海岸线中,较年轻的“接触2”显示出最接近于等势面的近似值。沿该表面的垂直变化发生在具有接触后形成地质活动的区域或等电位表面(例如,塔西斯)的位置随时间变化的可疑区域中。在接触2以下的所有尺度上,火星的表面都比上面的更光滑。接触2下方区域的体积(类似于1.5 x 10(7)km(3))在最小估计的总流出通道流量和最大估计的巨灰岩孔隙空间之间。这些结果与以下假设相吻合:在过去的火星历史中,大量的站立水占据了北部低地。 [参考:13]

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