Extended Abstract (1.4M)7A.1
Typhoon simulation with the JMA/MRI 20 km mesh high-resolution global spectral model
Hiroyuki Murakami, AESTO/MRI, Tsukuba, Ibaraki, Japan
The Japan Meteorological Agency (JMA), the Meteorological Research Institute (MRI) and the Advanced Earth Science & Technology Organization (AESTO) cooperate to develop a super-high-resolution AGCM (TL959L60;20km mesh), which is used for both weather forecasting and climate research.
In this study, medium-range forecasts were conducted for twelve of tropical storms between 2002 and 2005 over the Western North Pacific Ocean by the 20 km-mesh AGCM. These simulations were statistically verified with the best-track data. They were also compared with the results by the 60 km-mesh AGCM to evaluate differences in resolution.
The 20 km-mesh AGCM was found to predict tropical storms more realistically than the 60 km-mesh AGCM, especially in intensity. When the composite structure of the wind profile were compared, that of inner structure by the 20 km-mesh AGCM is quite realistic. The sharp increse of wind velocity within 100km from the center of the storm is well simulated by the 20 km-mesh AGCM, while the 60 km-mesh AGCM seems to be unable to resolve the structure due to the low resolution.
This study also indicates high-resolution AGCM is necessary for evaluating tropical storms in climate simulations.
Session 7A, Tropical Cyclone Modeling VI: High Resolution Simulations
Tuesday, 29 April 2008, 1:15 PM-3:00 PM, Palms GF
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