Long-term changes of precipitation intensity in monsoon Asia

对包括日本在内的亚洲季风国家自世纪以来的纸质或图像格式的逐日降水量和台风路径进行了数字化处理，并对逐日降水强度的长期变化进行了分析。自1930年以来，日本的降水强度普遍增强，特别是在日本东北部，具有统计意义。自1950年以来，菲律宾的降水强度在夏季有所增加，而干燥的趋势在西海岸地区在冬季检测。这些趋势与1940年以前的趋势不同。降水强度也受到ENSO事件和全球变暖的影响。越南中部地区也发现了1950年前后降水强度趋势的差异。

Paper or image format daily precipitation data and typhoon tracks in monsoon Asian countries including Japan back into the beginning of the 20th century have been digitized, and long-term changes of precipitation intensity on a daily basis have been analyzed. The precipitation intensity since 1930 has strengthened widely over Japan, in particular, with statistical significance in Northeast Japan. Precipitation intensity since 1950 in the Philippines has increased in summer, whereas drying trend is detected in the west coast region in winter. These trends are different when compared with those prior to 1940. Also precipitation intensity has been affected by both ENSO event and global warming. Difference of precipitation intensity trend between pre- and post-1950 has also recognized in Central Vietnam.