Abstract:

In Jiangsu,Shanghai and Zhejiang,the 3 provinces of East China,typhoon is the most important weather system.In this study,the frequency of the typhoon affecting this region is reconstructed based on kinds of historical documents and archives during 1644~1911,and the result is called F series.The average value of F is 098 t/a.Based on the wavelet analysis,the 4 a is the most notable period.1720~1770s,1780~1800s,1810s and 1850~1900s had 2~4 a period,while 1640~1700s and 1750~1890s had 4~8 a period.The trend of F and Nino3 index are almost same,the frequency of typhoon which affect this region is the result of ENSO changing perhaps.ElNino leads to the value of F growing in the region during Qing dynasty.During the study period,in a multidecadal scale,the warming in northern hemisphere and eastern China will increase the impact of the typhoon frequency in eastern coastal areas