[P-PS05] Mars

6:15 PM - 7:30 PM JST(9:15 AM - 10:30 AM UTC)

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

*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.