The Effect of the Frozen-Thaw Process in Tibetan Plateau on Summer Monsoon over Eastern Asia

The relationship between the frozen-thaw process in the Tibetan Plateau and the summer monsoon over eastern Asia was investigated according to the correlation between the frozen days of soil and the summer monsoon index.As a case,the correlation between the seasonal frozen-thaw process and the change of sensible heat and latent heat in Tuotuohe region,and eastern Asia summer monsoon onset was analyzed primarily.The results show that there is certain correlation between the frozen-thaw process and heating effect over the Tibetan Plateau in transitional season from winter to summer;the seasonal frozen-thaw of soil results in the transportation of sensible heat and latent heat from surface to atmosphere change with seasons;and heating effect over the Tibetan Plateau has a great influence on the time and intensity of the summer monsoon onset in eastern Asia.Therefore,the frozen-thaw process of soil plays an important role in Asian summer monsoon onset.