Survey of remnant seasonal ice patches at southern polar Mars

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2024-09-20 DOI:10.1016/j.icarus.2024.116331

M. Gergacz , A. Kereszturi

引用次数: 0

Abstract

On Mars after the recession of the seasonal polar ice cap, small icy patches in shady and/or low thermal conductivity places are left behind. These regions are then illuminated by direct sunlight during the summer, warm up and in an ideal case a liquid phase could emerge. This work is surveying HiRISE images for such ice patches and found 148 images with ice patches on them out of the 730 images that fit the selection criteria of location and season. Their separation of ice from other bright patches, like clouds or lighter shades of surface layers and rocks was possible by their bluish color and strong connection to local topography Images with ice patches ranged between 140° and 200° solar longitude in the latitude band between −40° and − 60°. The diameter of the ice patches ranges between 1.5 and 300 m, and they remain on the surface even after the seasonal polar cap has passed over the area for at least the duration range of 1.5–139 Martian days. This range of duration indicates not ephemerally formed ice in the night but longer presence at the surface.

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南极火星残余季节性冰斑调查

在火星上，季节性极地冰盖消退后，会在阴暗和/或热传导率低的地方留下小块冰层。这些区域在夏季受到阳光直射，温度升高，在理想情况下会出现液相。这项研究正在对 HiRISE 图像进行调查，以寻找此类冰斑，并在 730 幅符合地点和季节选择标准的图像中找到了 148 幅带有冰斑的图像。这些图像的颜色偏蓝，与当地地形密切相关，因此可以将冰与其他亮斑（如云层或浅色地表层和岩石）区分开来。冰斑的直径在 1.5 米到 300 米之间，即使在季节性极冠掠过该区域后，冰斑仍留在地表，持续时间至少在 1.5-139 个火星日之间。这一持续时间范围表明冰不是在夜间短暂形成的，而是在地表存在较长时间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

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