Japan Geoscience Union Meeting 2014

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International Session (Oral)

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

[P-PS02_28AM2] Mars

Mon. Apr 28, 2014 11:00 AM - 12:10 PM 418 (4F)

Convener:*Takehiko Satoh(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Masaki Ishiwatari(Department of Cosmosciences, Graduate school of Science, Hokkaido University), Ayako Matsuoka(Research Division for Space Plasma, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Yoshiyuki O. Takahashi(Center for Planetary Science), Sho Sasaki(Department of Earth and Space Sciences, School of Science, Osaka University), Hideaki Miyamoto(The University Museum, The University of Tokyo), Chair:Takehiko Satoh(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)

11:40 AM - 11:55 AM

[PPS02-P04_PG] Estimation of Martian atmospheric composition change caused by CO2 condensation and its application to radio occultation

3-min talk in an oral session

*Sayaka IKEDA1, Katsuyuki NOGUCHI1, Takeshi KURODA2, Martin PAETZOLD3 (1.Nara Women's University, 2.Tohoku University, 3.University of Cologne)

Keywords:Mars, CO2, supersaturation, condensation, radio occultation

We estimated the Martian atmospheric composition change caused by CO2 condensation using the Ar measurements obtained by Gamma Ray Spectrometer (GRS) onboard the 2001 Mars Odyssey. We applied this estimation of the composition change to the rederivation of the radio occultation (RO) measurements of Mars Global Surveyor (MGS) obtained at polar latitudes of the winter hemisphere, because the MGS RO standard product which is available to the public did not consider the atmospheric composition change by CO2 condensation. Using the rederived MGS RO measurements, we investigated the occurrence of CO2 supersaturation in the Martian polar winter atmosphere and found that there were more supersaturation in the rederived data than in the original data.