Study On Spatial And Temporal Distribution Of Climatic Factors In Shaanxi Province Based On

Based on the data of daily average airtemperature data from71meteorological station in Qinling Mountains from1961to2010, using the climate tendency rate, Mann-kendall, Morlet waveletanalysis and spatial interpolation of ArcGIS, the variation of accumulated temperature steadily≥10℃and≥0℃, their lasting days, the initial date and ending date are analyzed. The results are the follows:Based on the data of daily average metelogical data from95meteorological station in Shaanxi province from1961to2010, using the climate tendency rate, Mann-kendall, Morlet wavelet analysis and spatial interpolation of ArcGIS, the spatial temporal variation of metelogical data are analyzed. The results are shown as follows:(1) The accumulated temperature and durtion days of≥0℃and≥10℃in Shaanxi province are steadily increase,initial date are ahead,ending date are delay. Variation of the accumulated temperature.The sudden change of The accumulated temperature,initial date, ending date and duration, lasting days of≥0℃in Shaanxi province appeated in1997,1997,1972and1997. The sudden change of the accumulated temperature,lasting days, initial date and ending date of≥10℃in Shaanxi province appeated in1997,2002,1976and1996. In addition, heat reasources variation generally have the oscillation periods between20-30a and7-10a, but the strongest oscillation periods were different among them.in spatial, The accumulated temperature of≥0℃and≥10℃in Qinling Mountains have similar changes and increase trend.(2) The sunshine duration of annual and four seasonal presents more in northeast and less in southwest in Shaanxi province over past50years. The annual sunshine duration has decreased significantly by more than16.7h/10a and it had abrupt change point in1981and1997. Sunshine duration has decreased significantly in march-may and November and increased significantly in January, February, June-October and December. January, Mary, June, August, October and December had abrupt change point; April had two abrupt points; May and July had three abrupt points; February and November had no abrupt change. The change trend of annual sunshine duration contour for "north-north-south-north"; the change trend of spring,summer, Autumn and winter of sunshine duration contour for "north-south-south-north","north-north-south-north","north-south-north-south" and "south-south-north-south". Spring sunshine time is5～6a and30a cyclical period, summer sunshine time is26～30a cyclical period, autumn sunshine time is5～6a and25a cyclical period, winter sunshine time is3～5a and18a cyclical period.(3) The month analyses show that the increase of pan evaporation occurs mainly in3～7month, the decrease of pan evaporation occurs mainly in1～2,8and10～12month, and unchanged of pan evaporation in9month. The annual pan evaporation mainly increase trend, the point mutation is in1994. The seasonal analyses show that the increase of pan evaporation occurs mainly in Spring and Summer, the decrease of pan evaporation occurs mainly in Autumn and Winter. The increase of pan evaporation stations in Summer, and the decrease stations in Winter. The spatial distribution of the change rate shows that the decrease of pan evaporation mainly occurs in southwest of North Shaanxi, northeastern of North of short for Weihe River and parts of Western Guanzhong, the most parts of Shaanxi Weihe basin increased. In spring, summer and autumn pan evaporation changes in the spatial distribution of similarity, and mainly showed upward trend. The relative humidity, precipitation and pan evaporation is negatively related, Sunshine hours, daily range of air temperature, average wind speed and evaporation quantity is positively related.