Japan Geoscience Union Meeting 2025

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[J] Oral

P (Space and Planetary Sciences ) » P-PS Planetary Sciences

[P-PS08] Lunar Science and Exploration

Fri. May 30, 2025 10:45 AM - 12:15 PM 302 (International Conference Hall, Makuhari Messe)

convener:Yusuke Nakauchi(Ritsumeikan University), Keisuke Onodera(Institute for Planetary Materials, Okayama University), Yoshiaki Ishihara(Japan Aerospace Exploration Agency), Ayame Ikeda(Geological Survey of Japan, AIST), Chairperson:Yusuke Nakauchi(Ritsumeikan University), Kosei Toyokawa(Department of Space and Astronautical Science, The Graduate University of Advanced Studies)

11:15 AM - 11:30 AM

[PPS08-09] Water trapped at illuminated-polar region of Moon - the role of gardening effect

*Ko Hashizume1 (1.Faculty of Science, Ibaraki University)

Keywords:Moon, Water, Gardening Effect, Pumping Effect

Water in polar region of Moon, observed by remote-sensing, is considered to be trapped at two different types of location. One is the permanent shadowed region. Water is considered to sit at the surface of the cold regolith that never exceeds 110 Kelvin. The other type occurs at the Sun-illuminated region, which is the topic handled in this talk. In this type, water is delivered to a certain depth of the regolith, and permanently trapped there by the pumping-effect. However, to obtain a realistic view, how much and at what depth is the water trapped at the illuminated region, another effect needs to be considered, which occurs widely on Moon surface. This is the asteroidal impacts. Crator is formed by the impact. The regolth ejected by the impact then sits on the surface of the region surrounding the crator. These phenomena are so-called the gardening effect. The influence for the water trapped by the pumping effect is discussed in this talk.