Verification of a Mesoscale Data-Assimilation System for the Heavy Rain around the Tokyo Area

Abstract:

The Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has developed a multiscale, hybrid data-assimilation system. The spatial and temporal structure of the heavy rainfall around the Tokyo, Japan, is investigated using the assimilation system. Satellite observed Clouds, in-situ temperature and wind velocities are used for the assimilation system. Although the initial and boundary dataset from the operational mesoscale model (MSM) of the Japan Meteorological Agency (JMA) could not predict the heavy rainfall, hybrid data assimilation system showed the increased rainfall around the Tokyo area. The relevance of the heat island and heavy rainfall are also discussed.