Abrupt increase of winter rainfall in northern Taiwan in early 1980s and the weakening of the East Asian winter monsoon

• Main Authors: Kao, Pei-ken, 高培根
• Other Authors: Hung, chih-wen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/43633266352654136254

碩士 === 中國文化大學 === 大氣科學研究所 === 96 === The rainfall characteristic of the East Asian winter monsoon (EAWM) is less emphasized in previous works. This study reveals that the circulation of the EAWM weakened in the recent decades which results in the decreasing of winter rainfalls over several windward coastal areas over the East Asia including the hill region in the northern Taiwan. However, the southern China and the plain region over the northern Taiwan have an abrupt increase of rainfalls in early 1980s. This is due to the increasing of the sea surface temperature and lower troposphere moisture over the South China Sea under the global warming climate and the anomalous northward flow which enhance the moisture transport to the southern China. Because more moisture is provided for the frontal system which moves eastward, the fronts frequently come with abundant moisture and well-developed rain band in winter. Therefore, the plain region over the northern Taiwan can obtain more rainfalls after early 1980s.