An Analysis on Control Factors of Drought/Flood in the Changjiang Valley

The relationships between the probable control factors, such as the sea surface temperature (SST) in the equatorial Eastern Pacific and the subtropical high etc., and drought/flood in the Changjiang valley are studied by using the related moment analysis. The contribution of each factor to the formation of drought/flood is also discussed. The results show that the abnormal change of all factors in the earlier stage has influence, to a different degree, on the variation of precipitation in summer. The relationship is shown principally by the abnormal drought/flood years. The correlation of the SST, SOI and subtropical high with the drought/flood is persistent to a certain degree. The synthetical analysis of the factors indicate that SST, SOI, subtropical high and the temperature in the Changjiang valley area have greater contribution to the formation of drought/flood.