Ice in the lunar polar regions revisited
Ice in the lunar polar regions revisited
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DOI：
10.1029/2000je001491
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发表时间：
2002-02
影响因子：
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通讯作者：
R. Hodges
中科院分区：
文献类型：
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作者：
R. Hodges
[1]月球极地冷阱中可能存在水冰的普遍看法已成为选择空间研究目标的一个重要因素。本文的目的是解决两个主题是从月球水的话语失踪：的影响，原始清洁的风化层对水在月球上的运输，和水暴露的限制所暗示的极高的吸附潜力的表面的土壤颗粒。水的运输的特点是化学吸附在土壤颗粒和混合的“湿”颗粒到风化层的陨石园艺。弹道侧向流通常被认为是将水输送到两极的有效管道，但实际上是一种次要现象，它是由太阳风和微流星侵蚀促进的，而不是由热解吸作用促进的，就像主要的月球外大气层气体He和40 Ar的情况一样。模拟结果表明，即使在最乐观的条件下，不到7%的水积累在风化层驻留在极地冷阱，水浓度不能大于350 ppm。更重要的是，当在模拟器中使用现实的传输参数时，极地水浓度降低了近2个数量级。总之，月球两极存在水冰的说法是站不住脚的。
[1] The common wisdom that water ice may exist in lunar polar cold traps has become a significant factor in the selection of space research objectives. The purpose of this paper is to address two topics that are missing from the discourse on lunar water: the effect that the pristine cleanliness of the regolith has on water transport on the moon, and the limits on water exposure implied by the extremely high adsorption potentials of the surfaces of soil grains. Water transport is characterized by chemisorption on soil grains and the mixing of “wet” grains into the regolith by meteoritic gardening. Ballistic lateral flow, which is generally thought to be an efficient conduit for moving water to the poles, is actually a secondary phenomenon that is facilitated by solar wind and micrometeor erosion but not by thermal desorption, as is the case for the dominant lunar exospheric gases, He and 40Ar. Simulation results show that even under the most optimistic conditions, less than 7% of the water accumulated in the regolith resides in the polar cold traps, where water concentrations cannot be greater than 350 ppm. More important, when realistic transport parameters are used in the simulator, the polar water concentration is reduced by almost 2 orders of magnitude. In a word, the concept of water ice at the lunar poles is insupportable.