Japan Geoscience Union Meeting 2016

Presentation information

International Session (Oral)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS02] High performance computing of next generation weather, climate, and environmental sciences using K

Sun. May 22, 2016 1:45 PM - 3:15 PM 302 (3F)

Convener:*Masaki Satoh(Atmosphere and Ocean Research Institute, The University of Tokyo), Masahide Kimoto(Atmosphere and Ocean Research Institute, The University of Tokyo), Kazuo Saito(Forecast Research Department, Meteorological Research Institute), Hiromu Seko(Meteorological Research Institute), Takemasa Miyoshi(RIKEN Advanced Institute for Computational Science), Tetsuro Tamura(Tokyo Institute of Technology), Hiroshi Niino(Dynamic Marine Meteorology Group, Department of Physical Oceanography, Atmosphere and Ocean Research Institute,The University of Tokyo), Masayuki Takigawa(Japan Agency for Marine-Earth Science and Technology), Hirofumi Tomita(AICS, RIKEN), Chihiro Kodama(Japan Agency for Marine-Earth Science and Technology), Chair:Chihiro Kodama(Japan Agency for Marine-Earth Science and Technology)

2:00 PM - 2:15 PM

[AAS02-02] Resolution dependence of diurnal cycle of tropical precipitation in a global high-resolution simulation

*Hisashi Yashiro1, Kajikawa Kajikawa1, Yoshiaki Miyamoto1, Ryuji Yoshida1, Tsuyoshi Yamaura1, Hirofumi Tomita1 (1.RIKEN Advanced Institute for Computational Science)

Keywords:GCM, precipitation, high resolution simulation

We carried out the global high-resolution atmospheric simulations with five horizontal resolution from 14km to 0.87km. The Nonhydrostatic Icosahedral Atmospheric Model (NICAM; Satoh et al. 2014) was used for this study and both simulations and anarysis are conducted on the K computer. In the tropical region (15S-15N), the result shows clear resolution dependence of the diurnal precipitation cycle over the land. Relatively weak precipitation peak appeared at late night in the result of the coarse resolution. The peak becomes stronger and its time becomes faster with increasing the horizontal resolution. Theresolution dependence of temporal changes in the averaged environmental variables over the tropical land, such as CAPE, PBL height, cloud base height, and precipitable water, were analyzed. The result shows that the activation of the convections become earlier, especially in the simulations with grid spacing less than 2 km. This result suggests that the difference of convection activity around the noon at the different horizontal resolution affects timing of the peak of the daily precipitation.The early morning peak of tropical precipitation cycle over the ocean was also well reproduced, with lesser resolution dependence.