globalchange  > 气候减缓与适应
DOI: 10.1029/2018JE005579
Scopus记录号: 2-s2.0-85046550267
论文题名:
Examination of the Long-Term Subsurface Warming Observed at the Apollo 15 and 17 Sites Utilizing the Newly Restored Heat Flow Experiment Data From 1975 to 1977
作者: Nagihara S.; Kiefer W.S.; Taylor P.T.; Williams D.R.; Nakamura Y.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:5
起始页码: 1125
结束页码: 1139
语种: 英语
英文关键词: ALSEP ; Apollo ; heat flow ; Moon
Scopus关键词: experimental study ; heat flow ; image analysis ; monitoring ; Moon ; regolith ; temperature gradient ; warming ; Calluna vulgaris
英文摘要: The Apollo heat flow experiment (HFE) was conducted at landing sites 15 and 17. On Apollo 15, surface and subsurface temperatures were monitored from July 1971 to January 1977. On Apollo 17, monitoring took place from December 1972 to September 1977. The investigators involved in the HFE examined and archived only data from the time of deployment to December 1974. The present authors recovered and restored major portions of the previously unarchived HFE data from January 1975 through September 1977. The HFE investigators noted that temperature of the regolith well below the reach of insolation cycles (~1 m) rose gradually through December 1974 at both sites. The restored data showed that the subsurface warming continued until the end of observations in 1977. Simultaneously, the thermal gradient decreased, because the warming was more pronounced at shallower depths. The present study has examined potential causes for the warming. Recently acquired images of the Lunar Reconnaissance Orbiter Camera over the two landing sites show that the regolith on the paths of the astronauts turned darker, lowering the albedo. We suggest that, as a result of the astronauts' activities, solar heat intake by the regolith increased slightly on average, and that resulted in the observed warming. Simple analytical heat conduction models with constant regolith thermal properties can show that an abrupt increase in surface temperature of 1.6 to 3.5 K at the time of probe deployment best duplicates the magnitude and the timing of the observed subsurface warmings at both Apollo sites. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114005
Appears in Collections:气候减缓与适应

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作者单位: Department of Geosciences, Texas Tech University, Lubbock, TX, United States; Lunar and Planetary Institute, Universities Space Research Association, Houston, TX, United States; Goddard Space Flight Center, Greenbelt, MD, United States; Institute for Geophysics, University of Texas at Austin, Austin, TX, United States

Recommended Citation:
Nagihara S.,Kiefer W.S.,Taylor P.T.,et al. Examination of the Long-Term Subsurface Warming Observed at the Apollo 15 and 17 Sites Utilizing the Newly Restored Heat Flow Experiment Data From 1975 to 1977[J]. Journal of Geophysical Research: Planets,2018-01-01,123(5)
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