【摘要】 利用陕西96个台站近40a气候资料,通过对气温和降水两个基本气象要素变化特征进行全面分析,得到陕西气候变化的一些特征。(1)近40a来,陕西平均气温在经历了20世纪60年代后期的低温后,从80年代中期开始有明显的上升趋势,陕北西部上升幅度最为明显;冬季平均气温明显上升,夏季平均气温有明显的降低趋势;极端气温明显上升,特别是90年代以后极端最低气温上升明显。(2)陕西平均年总降水量波动略有减少,自20世纪90年代以后冬季降水量增加明显,夏季降水量减少,尤其是关中西部增加明显。(3)年平均气温、季平均气温变化存在以1985年为跃变点,这次跃变比全国晚5~7a,比西北地区提前1a。更多还原

【Abstract】 Some features of the Shaanxi climate during the past 40 years are shown by the investigation of the characteristics of the temperature,precipitation based on the data of 96 stations in Shaanxi which are the most complete station data sets in Shaanxi processed by the National Meteorological center recently.(1) The average temperature of Shaanxi increases most obviously since middle 1980’s after a long-term low temperature period in the later 1960’s.The temperature in the west Shanbei increases most obviously in winter and decreases obviously in summer.The extreme temperature increases obviously especially in the later 1990’s.(2) The total amount of the rainfall in Shaanxi has the slight decrease trend the total rainfall amount increases most obviously in winter and decreases most obviously in summer since 1990’s,especially in the west Guanzhong.(3) The average yearly and quarterly temperature has an obvious interdecadal climate jump and the jump point happened in 1985,5～7 years later than the jump point in China and 1 year later than the jump point in the Northwest region.更多还原