19th Conference on Climate Variability and Change
16th Conference on Applied Climatology
21st Conference on Hydrology


Early morning rainfall over the Strait of Malacca

Mikiko Fujita, Institute of Observational Research for Global Change/ Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; and F. Kimura, P. Wu, and M. Yoshizaki

Distinct diurnal variation of precipitation around the Strait of Malacca was elucidated using TRMM rainfall data and MM5 model. TRMM rainfall data shows the contrast of sea and land surface diurnal rainfall, in early-morning and evening, respectively. The model study in typical season suggests the following mechanism of the diurnal precipitation system. 1) During daytime, deep convection are induced by convergence of the up-slope winds caused by solar radiative heating over the mountains, while divergence is clear above the strait. This convection should produce an evening rainfall. 2) In evening, when daytime convections declines along mountains both side of the strait, cold air mass caused by evaporation of raindrop begins to blow toward the strait in lower atmosphere. This cold flow transports lower water vapor to the strait associating with a down-slope wind. 3) In midnight, two cold moist air flows converge above the strait, making a precipitation along the strait. The shape of terrain, like a deep basin, should strengthen the convergence in a layer below 900hPa along the strait.

extended abstract  Extended Abstract (976K)

Joint Poster Session 3, Diurnal (Joint between the 21st Conference on Hydrology, the 16th Conference on Applied Climatology, and the 19th Conference on Climate Variability and Change)
Wednesday, 17 January 2007, 2:30 PM-4:00 PM, Exhibit Hall C

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