Abstracts for the 6th International GAME Conf.
3-5 December 2004
Kyoto Japan
Observation and numerical experiments of orographic precipitation in the Mae Chaem watershed in Southeast Asia
Koji Dairaku (1), Seita Emori (1), Taikan Oki (3)
(1) National Institute for Environmental Studies
(3) Institute of Industrial Science, the University of Tokyo
A dense tipping-bucket rain gauge network was established in the Mae Chaem watershed in the mountains of northwestern Thailand as part of the Global Energy and Water Cycle Experiment (GEWEX) Asian Monsoon Experiment-Tropics (GAME-T). Investigations of rainfall amounts, intensities, durations, and frequencies in the rainy season revealed strong orographic rainfall enhancement in the region. The larger amount of high-altitude rainfall was attributed to duration and frequency rather than intensity. By investigating orographic precipitation using a regional atmospheric model, the duration and frequency of rainfall at high altitudes were found to be caused by two mechanisms: 1) convective clouds over mountains activate in the evening, and 2) seeder-feeder mechanism caused by strati formed by radiative cooling or heating in the middle troposphere and orographically triggered low-level convective clouds. The results of a numerical simulation were quite consistent with the measurements acquired from the tipping-bucket rainfall gauges.
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National Institute for Environmental Studies | |
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16-2 Onogawa Tsukuba Ibaraki 305-0053 | |
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