| Autor: |
Williams, J.‐P.1 jpierre@mars.ucla.edu, Greenhagen, B. T.2, Paige, D. A.1, Schorghofer, N.3, Sefton‐Nash, E.4, Hayne, P. O.5, Lucey, P. G.6, Siegler, M. A.3, Aye, K. Michael5 |
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| Zdroj: |
Journal of Geophysical Research. Planets. Oct2019, Vol. 124 Issue 10, p2505-2521. 17p. |
| Abstrakt: |
The Diviner Lunar Radiometer Experiment on the Lunar Reconnaissance Orbiter has been acquiring visible and infrared radiance measurements of the Moon for nearly 10 years. These data have been compiled into polar stereographic maps of temperatures poleward of 80° latitude at fixed local times and fixed subsolar longitudes to provide an overview of diurnal temperatures of the polar regions. The data have been divided into winter and summer seasons, defined by the times of year when the subsolar latitude is above or below the equator, to characterize the variations in seasonal temperatures that result from the 1.54° angle between the Moon's spin pole and the ecliptic plane. Since the illumination in the polar regions is perpetually at grazing angles, topography plays a dominate role in surface temperatures. Consequently, the surface and near‐surface thermal environment can vary in complex ways with time of day and season, which produces areas that are seasonally shadowed for prolonged periods and that are much more extensive than the permanently shadowed regions (PSRs). We find that surfaces below 110 K capable of cold trapping water over 1 Gyr increases by factors of 2.8 and 4.3 in the winter for the south and north polar regions, respectively, with seasonal residence times of adsorbed water molecules occurring at higher temperatures and thus larger areas. Plain Language Summary: The Diviner instrument on the Lunar Reconnaissance Orbiter has been providing temperature measurements of the lunar surface for nearly 10 years. These observations have been compiled into polar maps of the summer and winter seasonal temperatures. Illumination in the polar regions is perpetually at grazing angles, and therefore topography plays a large role in surface temperatures which can vary in complex ways with time of day and season. The areas that are cold enough to trap water during the winter season are significantly larger than the cold, permanently shadowed regions. Key Points: Nearly 10 years of Diviner data is compiled into summer and winter season temperature maps of the polar regions of the MoonSurface temperatures can vary in complex ways with time of day and seasonSeasonal shadowing increases in the south and north by factors 2.8 and 4.3, respectively, in winter which may influence volatile transport [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
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