HR: 17:30h
AN: H22I-07    [PDF]
TI: Asian monsoon system studies in CEOP
AU: * Matsumoto, J
EM: jun@eps.s.u-tokyo.ac.jp
AF: University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan
AB: One of the major targets of the CEOP monsoon study is to compare the monsoon systems in various regions on the earth. Although, Asian monsoon is often referred to as typical monsoon system, when viewed the seasonal change processes of convection, the northward and southward seasonal migrations show different character from other continental monsoons. This maybe a result of the land-ocean configuration and topography, but minute dynamics have not been yet realized. Another interesting point is the regional differences of pre-monsoon and monsoon onset processes, for example, between Indian and Indochina monsoon. The heating over the continent in the pre-monsoon season produces low level circulation between the continent and adjacent ocean which furnishes a necessary condition for the sudden monsoon onset both in Australian and Indian monsoon. This process is weak in case of Indochina monsoon onset and suggesting that the role of ocean is more important. The warming over the western North Pacific is crucial for the onset of Indochina monsoon, while that over the continent is important for the Indian monsoon onset. Why such difference is generated? The state of pre-monsoon rains over Indochina is also different from that over India. Periodic rains occur in April and early May in the pre-monsoon season over Indochina. These events are influenced by the invasion of mid-latitude disturbances. The major moisture for these rains comes from the Pacific, contrasting with the summer monsoon westerly flows. It is still unclear why Asian summer monsoon starts earliest over Indochina. Apparent regional differences of diurnal variations of tropical rainfall have been revealed in Asian monsoon region using minute rainfall observations, satellite remote sensing, radar observations and non-hydrostatic cloud-resolving numerical models. The diurnal eastward migrating rainfall system during summer monsoon season is investigated in Thailand. However, there are many different characters of diurnal rainfall variability in Asian monsoon region which have not been well understood. The mechanism causing above mentioned problems would be studied under CEOP integrated observational data and CIMS (CEOP Inter-monsoon Model Study).
DE: 1620 Climate dynamics (3309)
DE: 3309 Climatology (1620)
DE: 3322 Land/atmosphere interactions
DE: 3354 Precipitation (1854)
DE: 3374 Tropical meteorology
SC: Hydrology [H]
MN: 2003 Fall Meeting