Reconstruction of Asian monsoon climate in the 20th century based on data rescue

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Paper based meteorological data in monsoon Asian countries prior to the 1950s have been rescued by digitizing into the computer based climatological dataset, and long-term variations of Asian monsoon, typhoon activities, and typhoon tracks during the whole 20th century have been analyzed. The weakening and shortening trend of winter monsoon in Japan, recent delayed tendency in summer rainy season onset in the Philippines, increasing trend of rainfall intensity over Southeast Asia, multi-decadal variations in the number of typhoons, and northward shift of typhoon tracks in the lower latitude region have been found.