Analysis of the Long-Term Vibration of Jianghuai Meiyu in Response to Solar Activity Factor

Abstract

Take the solar activity as the external forcing factor of the earth' s climate,use wavelet analysis and cross wavelet analysis method, to research the relationship betw een the sunspot numbers and Meiyu in Changjiang-Huaihe River region,and the west Pacific subtropical high indices. The results show that the correlation betw een solar activity and Meiyu exists difference betw een the north,show positive correlation,and the south,show negative correlation. That is to say,during the high sunspot number years,the rainfall in the north area of Changjiang-Huaihe River region would markedly increase,meanw hile,the south area would decrease.Furthermore,the positive and negative correlation remains unchanged in time series. In the south part,M eiyu precipitation and the sunspot numbers has stable resonance cycle in 11 years,and Meiyu lag the sunspot numbers for about 0. 5 ~ 1 year. The western Pacific subtropical high indices and the sunspot numbers also have good correlation. During the high sunspot number years,the subtropical high is shifted more southw ard and stronger,and the square is larger,or vice versa. That means the process chain of solar activity-western Pacific subtropical high-M eiyu in Changjiang-Huaihe River region may be exist in the influence of solar activity on the climate.