Abstracts for the 5th International GAME Conf.

3-5 October 2001

Aichi Trade Center

Nagoya Japan

Organization Process of Meso-scale Disturbances Developed in the Mei-yu Front during GAME/HUBEXf98 IOP

Masayuki Kawasima (1), Yasushi Fujiyoshi (2), Katsuyoshi Tanaka (1)

The organization process of meso-scale disturbances is quite interesting to study. It is, however, quite difficult to observe all life stages of meso-scale disturbances, because they usually move very fast. During GAME/HUBEXf98 IOP, two meso-vortices (about 200 km in horizontal scale) developed and decayed within the coverage of Fuyang Radar (500 km in diameter). The radar coverage was fully surrounded by special upper air sounding stations. By making use of the radar, the radio sonde and GMS data, we studied the precipitation efficiency and the organization process of two meso-vortices. It is quite interesting that the time lag between the peaks of water vapor flux and precipitation was 12 hours. Small convective clouds began to develop about 6 hours after the increment of water vapor flux and then began to organize into the meso-scale disturbance. Considering this time lag, the precipitation efficiency of the meso-scale cloud systems was about 50 ? 70 %. We also tried to simulate these vortices by making use of Japan Spectrum Model and a Cloud Resolving Modelto study the effect of land surface processes on the development of disturbances.

Submittal Information

Name : Date :
    Masayuki Kawasima
    31-May-01-11:18:22
Organization : Theme :
    Institute of Low Temperature Science, Hokkaido University
    Theme 2
Address : Presentation :
    N19 W8, Sapporo 060-0819
    Poster or oral
Country : Abstract ID :
    Japan
    T2MK31May01111822
Phone : Fax :
    011-706-6895
    011-706-7142
E-mail :
    kawasima@lowtem.hokudai.ac.jp