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DOI | 10.1029/2019GL083158 |
The Young Age of the LAMP-observed Frost in Lunar Polar Cold Traps | |
Farrell, W. M.1; Hurley, D. M.2; Poston, M. J.3; Hayne, P. O.4; Szalay, J. R.5; McLain, J. L.6 | |
2019-08-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:15页码:8680-8688 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The Lunar Reconnaissance Orbiter/Lyman Alpha Mapping Project (LAMP) ultraviolet instrument detected a 0.5-2% icy regolith mix on the floor of some of the southern pole permanently shadowed craters of the Moon. We present calculations indicating that most or all of this icy regolith detected by LAMP (sensed to a depth of <1 mu m) has to be relatively young-less than 2,000 years old-due to the surface erosional loss by plasma sputtering (external ionized gas-surface interactions), meteoric impact vaporization, and meteoric impact ejection. These processes, especially meteoric impact ejection, will disperse water along the crater floor, even onto warm regions where it will then undergo desorption. We have determined that there should be a water exosphere over polar craters (e.g., like Haworth crater) and calculated that a model 40-km-diameter crater should emit similar to 10(19 )H(2)O per second into the exosphere in the form of free molecules and ice-embedded particulates. Plain Language Summary Spacecraft orbiting the Moon have detect a low density water frost on the floor of some of the south polar craters-regions that are known to be very cold and can trap water and other volatiles. The floor of these craters is also exposed to the space environment including incoming meteors and ionized gases from the sun (that migrate into the shadowed craters via plasma expansion processes). We show that the flux of these external environmental processes can erode the frost-with a layer of 1/2 of a micron of frosty soil being eroded on time scales of less than 2,000 years. Further, the products of this erosion are ejected into space above the crater and thus could be detected by properly instrumented polar orbiting spacecraft. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000483812500011 |
WOS关键词 | WATER ICE ; REGIONS ; MOON |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186017 |
专题 | 气候变化 |
作者单位 | 1.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; 2.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA; 3.Southwest Res Inst, San Antonio, TX USA; 4.Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA; 5.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA; 6.Univ Maryland, Ctr Res & Explorat Space Sci & Technol 2, College Pk, MD 20742 USA |
推荐引用方式 GB/T 7714 | Farrell, W. M.,Hurley, D. M.,Poston, M. J.,et al. The Young Age of the LAMP-observed Frost in Lunar Polar Cold Traps[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(15):8680-8688. |
APA | Farrell, W. M.,Hurley, D. M.,Poston, M. J.,Hayne, P. O.,Szalay, J. R.,&McLain, J. L..(2019).The Young Age of the LAMP-observed Frost in Lunar Polar Cold Traps.GEOPHYSICAL RESEARCH LETTERS,46(15),8680-8688. |
MLA | Farrell, W. M.,et al."The Young Age of the LAMP-observed Frost in Lunar Polar Cold Traps".GEOPHYSICAL RESEARCH LETTERS 46.15(2019):8680-8688. |
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