STUDY ON CLIMATIC CHARACTERISTICS OF CHINA-INFLUENCING TYPHOONS AND THE INTERRELATIONS BETWEEN THEM AND THEIR ENVIRONMENTAL FACTORS
WANG Yong-mei1, LI Wei-jing 2, REN Fu-min2, WANG Xiao-ling2 (1. Yuncheng Weather Bureau of Shanxi Province, Yuncheng 044000 China;2. National Climate Center, China Meteorological Administration, Beijing 100081 China)
Climatic characteristics of China-influencing typhoons (CIT) were analyzed in this paper. Main characteristics include:(1) CIT season is May-November, especially from July to September. (2) Frequency of the CIT shows a decreasing trend during 1951-2004, especially after the late period of the 1960s. (3) Strong CIT also shows an obvious decreasing trend. Meanwhile, there exist obvious interdecadal variations in the CIT genesis, being more southward and eastward than normal in 1960s-1970s, and more northward and westward than normal in the 1980s. In addition, the interrelations between CIT and its environmental factors show that CIT has close relationships with sea surface temperature and East Asian summer monsoon;the structure of the circulations in frequent CIT years is much different from that in infrequent CIT years.