Abstract
Since 1997, rainfall has been measured by using tipping-bucket rain gauges in a mountainous area as a part of GAME-Tropics (the Global Energy and Water Cycle Experiment (GEWEX) Asian Monsoon Experiment (GAME)). The fact that a larger amount of rainfall was recorded at a high altitude was attributed to duration and frequency rather than intensity. After investigating orographic precipitation using a regional climate model, the duration and frequency of rainfall at high altitudes were found to be caused by two mechanisms: 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 a numerical simulation were quite consistent with the measurements acquired from the tipping-bucket rainfall gauges.
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