[P-PS02_28PO1] Mars

[PPS02-P04] 火星の大気主成分凝結を考慮したMGS電波掩蔽観測データの再導出とその応用

*池田 さやか¹、野口 克行¹、黒田 剛史²、ペッツォルド マーチン³ (1.奈良女子大学、2.東北大学、3.ケルン大学)

キーワード：火星, CO2, 過飽和, 凝結, 電波掩蔽

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.