Abstracts for the 6th International GAME Conf.

3-5 December 2004

Kyoto Japan

Contrasting feature of the seasonal heating between the Indochina Peninsula and the Bay of Bengal

Hiroaki Ueda (1), Noriko Ishizaki (1)

The horizontal and vertical distribution of the apparent heat sources (Q1) and the apparent moisture sinks (Q2) are quantitatively analyzed over and around the Indochina Peninsula by use of GAME reanalysis dataset during April through June, 1998. The focus of this study is the difference of the heating process over the eastern part of the Indochina Peninsula (EIP) and the Bay of Bengal (BoB). From the atmospheric circulation field, the large-scale monsoon onset can be recognizable in middle May. During the pre-monsoon season, the diabatic heating in excess of 200 Wm-2 locates over the EIP. Comparing the distribution of and , it is inferred that the latent heat flux contribute to the total heating as much as the sensible heat flux. The vertical distributions of Q1 and Q2 imply that the pre-monsoon rainfall may associated with cumulus type convection. On the other hand, the BoB exhibits radiative cooling, probably because of the downward motion and the resultant convective suppression. During the post-monsoon season, the atmospheric heating in the EIP is nearly equivalent with those of the pre-monsoon season. In contrast, the troposphere over the BoB is abruptly occupied by large Q1 with a peak near 500hPa, and the value of exceeds 400 Wm-2. The profile of Q2 is similar to those of Q1, except for lower peak in 700hPa, which is indicative of the rainfall associated with cumulus type convection. Therefore, the upward motion over the Peninsula (orographic effect) and the downward motion over the Bay of Bengal during the pre-monsoon season can make an obvious regionality in the atmospheric heating mechanism.

Submittal Information

Name : Date :
    Noriko ISHIZAKI
    30-Jul-04-12:08:14
Organization : Theme :
    University of Tsukuba
    Theme 3
Address : Presentation :
    Tsukuba, Ibaraki 305-8572
    Poster or oral
Country : Abstract ID :
    Japan
    T3NI30Jul04120814
Phone : Fax :
    +81-29-853-5692
    +81-29-853-5692
E-mail :
    s025299@ipe.tsukuba.ac.jp