Abstract
Monsoon effect simulation on typhoon rainfall potential - Typhoon Morakot (2009)
Highlights
Predicting the accumulated rainfall before typhoon landfall is a challenging weather forecast and prediction task for authorities
The unsurprising finding is that the water vapor content and the wind field convergence both influence rainfall intensity
The heavy rainfall event in southern Taiwan caused from Typhoon Morakot (2009) and the SW monsoon is studied
Summary
Predicting the accumulated rainfall before typhoon landfall is a challenging weather forecast and prediction task for authorities. The TRaP is the first time satellite data were adopted for typhoon rainfall potential (TRP) This method did not consider the typhoon rain band rotation and orographic effect. The I-TRaP approach considers the Tropical Cyclone (TC) spiral rain band rotation and takes topographic and monsoon effects into account for remapping and rescaling the TC rainfall spatial pattern and intensity. The TC rainfall spatial distribution (remapping) is constructed as a function of the TC location according to historical ground truth and satellite retrievals (about 73 cases from 1997 to 2008) Through these efforts, I-TRaP could include the topographic effect and the TC spiral rain band rotation. 1d, e, and f), the rainfall potential was overestimated These discrepancies might be because the coupling effects between the typhoon circulation and seasonal monsoon on the rainfall intensity wind field and water vapor flux convergence/divergence was not considered. The results will lead to further I-TRaP improvement in typhoon rainfall forecasting
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