Analysis on Variation of Precipitation in May in Ningxia and Its Response to Prior SST
Based on the global monthly mean sea surface temperature（SST） and wind field from NCEP/NCAR reanalysis data and precipitation data in May at 19 meteorological stations in Ningxia, the relations of prior SST with precipitation in May and key affecting area of prior SST on precipitation were studied using the Empirical Orthogonal Function（EOF）, related survey and departure synthetic method. The results indicated that the variance contribution of EOF1 of precipitation in May was close to 75%, while the variation trend of time coefficient appeared convex type. There was significant correlation be- tween prior monthly mean SST with precipitation in May in Ningxia. There were some significant positive correlation regions in the equatorial East Pacific Ocean, the equatorial Indian Ocean and the mid-Atlantic. The area of significant negative correlation was small. The amount of grid points passed the confident level of 90% was maximum in February, hut minimum in April. The SST anomaly synthesis was contrary in more and less precipitation years in May. The positive and negative departure centres were no difference - which was similar to the related area. The positive correlation was corresponding to the positive departure centre in more precipitation year and the negative correlation was corresponding to the negative departure centre; and on the contrary in less precipitation year, there is well inconsistent.
NETL
NSTL
万方数据
维普
