Japan Geoscience Union Meeting 2015

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International Session (Oral)

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

[P-PS05] Mars

Wed. May 27, 2015 2:15 PM - 3:00 PM 106 (1F)

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

2:53 PM - 2:56 PM

[PPS05-P02] Interannual analyses of the longitudinal distributions of Martian water ice clouds, dust and temperature by MRO-MCS

3-min talk in an oral session

*Katsuyuki NOGUCHI1, Makiko YAMAYA1, Asami FUJIO1, Takeshi KURODA2, Hiroo HAYASHI3 (1.Nara Women's Univeristy, 2.Planetary Plasma and Atmospheric Research Center, Tohoku University, 3.FUJITSU FIP CORPORATION)

Keywords:Mars, water ice clouds, dust, temperature, MRO, MCS

We investigated the longitudinal distributions of dust and clouds with temperature and their correlations in the Martian atmosphere by using Mars Reconnaissance Orbiter Mars Climate Sounder (MRO-MCS) multi-year measurements. Results show that the water ice clouds concentration around Hellas Planitia (30-60S, 50-100E) decreased during late autumn and early spring in the southern hemisphere (Ls=70-110 deg), and temperature and the dust concentration in the same region increased simultaneously. The results suggest that the heatup by dust sublimated water ice clouds to decrease the concentration of water ice clouds. The decrease of water ice clouds and the corresponding behaviors of temperature and dust were clearly observed in three Mars Years (MY29-31), suggesting the strong interannual repeatability.