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DOI | 10.1029/2020GL088930 |
The boundary of alkali surface boundary exospheres of Mercury and the Moon | |
M. Sarantos; S. Tsavachidis | |
2020-07-29 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | Global exosphere models of alkali gases surrounding Mercury and the Moon assume that the primary effect of the porous soil is to reduce the effective desorption rates. We demonstrate with a kinetic simulation that, following adsorption, the complicated structure of soils has two additional effects on the fate of previously released alkali atoms:1) trapping of free atoms at lunar temperatures by microscopic shadows and inward diffusion, which becomes the primary sink mechanism; and 2) high energy barriers for thermal desorption compared to what would be retrieved from experiments on thin films or compacted pellets, especially when surface diffusion of adsorbates is considered. Lunar soils retain one‐fifth to two‐thirds of recycled adsorbates, depending on the assumed adsorbate mobility, photodesorption cross section, and soil thermal gradient. A transition from a retentive surface to full outgassing at T>500K will produce complex feedback mechanisms of alkali circulation at Mercury. |
领域 | 气候变化 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/286644 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | M. Sarantos,S. Tsavachidis. The boundary of alkali surface boundary exospheres of Mercury and the Moon[J]. Geophysical Research Letters,2020. |
APA | M. Sarantos,&S. Tsavachidis.(2020).The boundary of alkali surface boundary exospheres of Mercury and the Moon.Geophysical Research Letters. |
MLA | M. Sarantos,et al."The boundary of alkali surface boundary exospheres of Mercury and the Moon".Geophysical Research Letters (2020). |
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