Japan Geoscience Union Meeting 2016

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Poster

Symbol M (Multidisciplinary and Interdisciplinary) » M-GI General Geosciences, Information Geosciences & Simulations

[M-GI22] Development of computational sciences on planetary formation, evolution and surface environment

Tue. May 24, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Junichiro Makino(RIKEN AICS), Yoshi-Yuki Hayashi(Department of Planetology/CPS, Graduate School of Science, Kobe University), Shigeru Ida(Department of Earth and Planetary Science, Graduate School of Science and Technology, Tokyo Institute of Technology), Yuri Aikawa(Center for Computational Sciences, University of Tsukuba), Masaki Ogawa(Division of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo), Masayuki Umemura(Center for Computational Sciences,　University of Tsukuba)

5:15 PM - 6:30 PM

[MGI22-P07] Martian dust devil statistics from high-resolution large-eddy simulations

*Seiya Nishizawa1, Masatsugu Odaka2, Yoshiyuki O. Takahashi3, Ko-ichiro SUGIYAMA4, Kensuke Nakajima5, Masaki Ishiwatari2, Shin-ichi Takehiro6, Hisashi Yashiro1, Yousuke Sato1, Hirofumi Tomita1, Yoshi-Yuki Hayashi3 (1.RIKEN AICS, 2.Hokkaido Univ., 3.Kobe Univ., 4.ISAS, 5.Kyushu Univ., 6.Kyoto Univ.)

Keywords:Mars, dust devil

Martian dust devil has an important role in Martian atmospheric circulation, and we examine statistics of Martian dust devil with a high-resolution (up to 5 m) and wide-domain (about 20 x 20 km2) large-eddy simulation of the Martian planetary boundary layer. In this study, we define strong isolated vortex as dust devil. We clarified the distributions of size and intensity and concluded that the maximum vertical vorticity of an individual dust devil has an exponential distribution, while the radius and circulation have power-law distributions.
We also examine dependency of the statistics on experimental resolution with a grid-refinement experiment. These statistics will lead to more accurate estimation of dust injection from the surface to the atmosphere and a more sophisticated parameterization of the dust injection for use in general circulation models.