Climatic background of abnormal autumn drought in Guangxi and its cause of formation

This paper uses synthesis,wavelet analysis and so on to conduct the climate conditions and characteristic analysis of the last 45a autumn precipitation,and discuss the possible causes and factors of the abnormal autumn drought in Guangxi.Result indicates that the Asia continent subtropical high intensified abnormally maybe the main reason that causes severe autumn drought in Guangxi.There are two distinct oscillations in the seasonal precipitation time serial.The ENSO event as the representation of the thermal oscillation in tropical Pacific Ocean,and the periodicity of the solar activity is important influence factors in these two kinds of oscillations.