研究期間：10108~10207;In summer, southwesterly flow from South China Sea could enhance the precipitation in Taiwan, especially converged with typhoon peripheral circulation during the period of typhoon passed by. The rainfall is even intense than the typhoon itself which may cause the severe disaster in mountainous areas. Therefore, the investigation of the southwesterly and northeastern flow effect on the precipitation around Taiwan areas is the main objective of this project for the forecast of rainfall potential. With the integration of passive microwave data radar data and ground-based measurement the analysis of air-sea parameters such as near surface wind field, sea surface temperature, near surface temperature and humidity, air-sea energy flux, moisture flux, vorticity, convergence and divergence will be examined for the influence in typhoon precipitation. In the first year, the project will focus on the improvement of the southwesterly flow precipitation index (SFPI) with the consideration of topographic and altitude effects. The effect of convergence with monsoon circulations on typhoon rainfall intensity will be investigated with the integrated datasets (passive microwave data radar data and ground-based measurement) in the second year. In the last year, the influence of air-sea energy flux, water vapor flux, vorticity, convergence, and divergence on typhoon precipitation will be concluded and applied to the forecasting of regional rainfall and typhoon precipitation as the project expected.
