Abstracts for the 6th International GAME Conf.

3-5 December 2004

Kyoto Japan

Improving Simulation of Southeast Asia Rainfall using RegCM3 and problems for the tropical region.

Dr.Sc. KIEU THI XIN (1)

The RegCM3 of 0.5x0.5 lat-long degress with 18 vertical levels is used for seasonal tion simulation of Southeast Asia rainfall. First of all we performed the sensivity experiments regarding domain size and convection parameterization schemes under giving lateral boundary conditions of different reanalysis data ( NCEP, ECMWF, and ERA-40) in oder to determine the optimal model conditions for the Southeast Asia region where rainfall caused most by deep convection originated from tropical oceans. The RegCM3 is intergrated during two rain seasons of 1996 and 1997 as typical wet and dry year with different convection schemes. Preliminary conclusions: NCEP and ECMWF do not adequately simulate Southeast Asia rainfall, ERA-40 reanalysis data are more suitable for seasonal simulation of the Southeast Asian region than NCEP and ECMWF. RegCM3 could provide major features of the local circulation of the region but the simulated horizontal and vertical transport is too active for Southeast Asia. When ERA-40 is used for lateral boundary condition the RegCM3 simulates major rainfall patters and magnitudes better using Grell convection with FC closure assumption, but underestimated the temperature fields by 3-4 C-degrees and even higher. All the convection schemes (Kuo-, Grell with different closure assumptions) in current RegCM3 are not good enough for raifall simulation over the Southeast Asia. Future work Need to improve analysis data for initial and lateral boundary conditions by assimilation of more o given bservations over this region to suppress two active model transport Need to include and a new convection parameterization scheme in RegCM3 and modify it for the tropics

Submittal Information

Name : Date :
    Dr.Sc. KIEU THI XIN
    13-Aug-04-10:02:42
Organization : Theme :
    Group of Research and Development Weather and Climate forecast Head, Department of Meteorology Vietnam National University of Hanoi
    Theme 4
Address : Presentation :
    334 NGUYEN TRAI, THANH XUAN, HANOI, VIET NAM
    Poster or oral
Country : Abstract ID :
    Viet Nam
    T4DKTX13Aug04100242
Phone : Fax :
    0084 4 55838 11
    0084 4 8583061
E-mail :
    xinkt@vnu.edu.vn, kieu@ncst.ac.vn