HR: 09:45h
AN: H51A-08    [PDF]
TI: Observation And Simulation Of Monsoon Rainfall Over A Tropical Mountainous Region In Southeast Asia
AU: * Dairaku, K
EM: dairaku.koji@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa Tsukuba, Ibaraki, 305-8506 Japan
AU: Emori, S
EM: emori@jamstec.go.jp
AF: Frontier Research System for Global Change, 3173-25 Showamachi, Kanazawa-ku, Yokohama City, Kanagawa, 236-0001 Japan
AU: Oki, T
EM: oki@chikyu.ac.jp
AF: Research Institute for Humanity and Nature, 335 Takashima-cho, Marutamachi-dori Kawaramachi nishi-iru, Kamigyo-ku, Kyoto, 602-0878 Japan
AB: From 1998, as a part of GAME-Tropics (the Global Energy and Water Cycle Experiment (GEWEX) Asian Monsoon Experiment (GAME)) research activities in Thailand in Southeast Asia, high-temporal-resolution ground-based rainfall observations have been conducted in a mountainous area. It is clear that the quantity of rainfall varies with elevation in this watershed throughout the rainy season. The orographic characteristics of rainfall are attributed to higher duration and frequency rather than to intensity. A two-dimentional, nonhydrostatic compressible dynamic-equations model was used. In this numerical experiment, two mechanisms were observed: 1) Convective clouds over mountains are activated in the evening, and 2) stratus formed by radiative cooling or heating at the tops of clouds and low-level orographically triggered convective clouds cause a seeder-feeder mechanism. The results of the simulation are quite consistent with the fact that a larger quantity of rainfall recorded at a higher altitude can be attributed to a greater duration and higher frequency rather than to a greater intensity of rainfall.
DE: 1854 Precipitation (3354)
DE: 3329 Mesoscale meteorology
DE: 9320 Asia
SC: Hydrology [H]
MN: 2003 Fall Meeting