Analysis on N character of Precipitation During Rainy Season in Fujian Province

Based on the data of monthly precipitation of 53 years from 66 conventional meteorological stations,monthly mean re-analysis lattice point data of NCEP/NCAR and re-established data of sea temperature from NOAA,temporal and spatial characters of precipitation during rainy season in Fujian province were studied by using empirical orthogonal function decomposition(EOF),singular value decomposition(SVD)and correlation analysis methods.The results showed that the precipitation during rainy season in Fujian had an spatial character,which was either drought or flood in all the provincial areas.In addition,the precipitation along with longitude direction presented a heterogeneous distributing character,which was either flood in south and drought in north or flood in north and drought in south.With the analysis on general atmospheric circulation and ocean character in the abnormal years,the distribution of temperature field at ground level presented a remarkable character of cold in north and warm in south.Whilst,the western pacific subtropical high showed westerly direction and strong,and the stronger southwest wind at lower layer in north of the western pacific subtropical high pushed moisture to far north location.Meanwhile,summer wind in southern ocean became weaken,the middle-east equator pacific ocean were covered with extremely cold water.The blocking high turned to be great during early period in winter at Urals,and the western pacific subtropical high was in large scale,great intensity and extending to far west.The temperature in the middle-east equator pacific ocean became high,then became low in west wind drift region.The reverse was true in the years of flood in south and drought in north.The finding in this paper could provide a reference frame for short time climatic prediction and agricultural arrangement.