Japan Geoscience Union Meeting 2015

Presentation information

International Session (Oral)

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

[P-PS05] Mars

Thu. May 28, 2015 11:00 AM - 12:45 PM A03 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

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:Takehiko Satoh(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)

12:15 PM - 12:30 PM

[PPS05-15] Assessment of Mars surface environment for a exploration program: application of CReSS to Martian atmosphere

*Ko-ichiro SUGIYAMA1, Masatsugu ODAKA2, Kensuke NAKAJIMA3, Yoshiyuki O. TAKAHASHI4, Naohito OTOBE5, Seiya NISHIZAWA6, Yoshi-yuki HAYASHI4, George HASHIMOTO7, Kouichi HASEGAWA8, Atsusi SAKAKIBARA8, Kazuhisa TSUBOKI9 (1.ISAS/JAXA, 2.Hokkaido University, 3.Kyushu University, 4.Kobe University, 5.Fukuoka University, 6.RIKEN Advanced Institute for Computational Science, 7.Okayama University, 8.chuden CTI, 9.Nagoya University)

Keywords:Martian atmosphere, planetary exploration, numerical modeling, cloud resolution model

A Mars surface exploration program is now planned by space engineering and planetary science communities in Japan. To support designing the landing module and observation instruments and ensure safety mission operation, evaluation of plausible range of meteorological conditions at proposed landing site is required. For mesoscale assessment of Mars surface environment, we are now trying to apply "Cloud Resolving Storm Simulator (CReSS)" (Tsuboki and Sakakibara, 2002) to Martian atmosphere.

CReSS is a numerical model based on quasi-compressible system (Klemp and Wilhelmson, 1978). To apply CReSS to Martian atmosphere, radiative transfer scheme (Takahashi et al., 2006) used by planetary atmospheric general circulation model DCPAM (Takahashi et al. 2012) is introduced. The surface topography, albedo, and thermal inertia are adopted from Mars Global Surveyor observation data. The terrestrial calendar included in CReSS, which defines the length of year, month, hour, and minute, is modified to be suitable for Mars' rotation and orbital period.

To examine the model performance, we perform some idealized numerical experiments without the surface topography and effects of large-scale circulation. At first, we perform comparing experiments to the result of one-dimensional radiative-convective calculations (DCPAM-1D) with almost same experimental setting, and find that the simulated diurnal variations of surface temperature and heat budget at the surface are consistent with those of DCPAM-1D. Next, we perform experiments with solar radiative condition at the landing sites of NASA's rover, Spirit and Opportunity. We find that the simulated vertical temperature profiles near the surface in daytime are consistent with the data of NASA's rover if using mixing length of sub-grid scale turbulence parameterization given by Deardorff et al. (1980) which is commonly adopted in previous studies (e.g. Spiga et al., 2010). Following the idealistic experiments mentioned above, we begin to perform more realistic numerical experiments at proposed landing sites. In the experiments, the surface topography and effects of large-scale circulation are considered. In order to consider the effects of large-scale circulation, simulation data of DCPAM is used as initial and boundary conditions.

In this presentation, we show outline of our numerical model and some results of numerical experiments.