دانلود مقاله ISI انگلیسی شماره 156752
کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
156752 2017 6 صفحه PDF سفارش دهید 4377 کلمه
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عنوان انگلیسی
Effects of varying obliquity on Martian sublimation thermokarst landforms
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Icarus, Volume 281, 1 January 2017, Pages 115-120

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چکیده انگلیسی

Scalloped depressions in the Martian mid-latitudes are likely formed by sublimation of ice-rich ground. The stability of subsurface ice changes with the planetary obliquity, generally becoming less stable at lower axial tilt. As a result, the relative rates of sublimation and creep change over time. A landscape evolution model shows that these variations produce internal structure in scalloped depressions, commonly in the form of arcuate ridges, which emerge as depressions resume growth after pausing or slowing. In other scenarios, the formation of internal structure is minimal. Significant uncertainties in past climate and model parameters permit a range of scenarios. Ridges observed in some Martian scalloped depressions could date from obliquity lows or periods of low ice stability occurring <5 Ma, suggesting that the pits are young features and may be actively evolving.

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