Abstracts for the 6th International GAME Conf.

3-5 December 2004

Kyoto Japan

A change of mean physical quantity in the monsoon and pre-monsoon.

K. Mushiake (10), A. Watanabe (10), Y. Tachibana (2), S. Ogino (3), Y. Shibagaki (4), T. Ohsawa (3), Y., M. Yamanaka (3), T. Oki (7), T. Satomura (8), A. Sumi (9)

We carried out rawinsonde observation to understand the atmospheric circulation in the pre-monsoon and the monsoon periods over Thailand. We observed the upper atmospheric structure by rawinsonde four times a day from Apr. 15 to Jul.15, and from Aug.15 to Sep15, 1998 at Chiang Mai, Ubon Ratchathani and Bangkok in Thailand. It is very important to understand a difference of the atmospheric circulation between the pre-monsoon and the monsoon periods. We are able to divide into 3 classification on Apr. 15 to May 13, May 14 to Jun. 15, and Sep. 15 from Aug. 15, to understand the fluctuation of the monsoon. And we calculated the mean field of the meteorological element every 3 classification. The pressure decreases about 2hPa under the 5km in the rainy season than the pre-monsoon. But, the pressure increases about 3hPa over the 5km in the rainy season than the pre-monsoon. Furthermore, the temperature decreases about 2¡î under the3km, and the temperature increases about 4¡î over the 3km in the rainy season than the pre-monsoon. Accordingly, we are unable to explain the pressure decrease of the lower layer with the temperature change. We are conceivable that this mean field was made with a convective activity. It became clear that decreasing of pressure of the lower layer strengthens the south wind, and convective instability is strengthened by advection of water vapor by the south wind.

Submittal Information

Name : Date :
    Akira Watanabe
    09-Aug-04-16:42:13
Organization : Theme :
    Fukushima University
    Theme 3
Address : Presentation :
    1,Kanayagawa Fukushima ,960-1296
    Poster or oral
Country : Abstract ID :
    Japan
    T3AW09Aug04164213
Phone : Fax :
    024-548-8203
    024-548-8203
E-mail :
    may@educ.fukushima-u.ac.jp