中文摘要：

选取西宁市1961-2005年45年历年逐旬气温,降水量,日照时数;逐月气温,降水量,日照时数;年均气温,年降水量,年日照时数等气象数据资料,结合数学统计分析揭示了西宁市当代气候变化的特点。结果显示：近45年来西宁市气温、降水均有所增加,升温率为0.01℃/10a,降水量增长率为15.68mm/10a;年均日照时数呈明显减少趋势,递减率为86.52h/10a。年平均最低气温呈整体明显上升趋势,升温率为0.33℃/10a,年平均最高气温整体呈下降趋势,递减率为-0.05℃/10a;季节变化表明,气温变幅最大的是冬季,在波动中呈显著的增加趋势;降水主要集中在夏季,占全年降水的57.22%。四季降水量均有增加趋势,夏季降水量增加幅度最大;全年四季日照时数均在减少,但递减率变化不同,冬春季节递减率较大。总体气候变化而言,西宁市经历了冷干-暖干-凉湿的变化阶段,目前正处在凉湿多雨阶段,以后可能向暖干型变化,这有待进一步研究证实。

英文摘要：

Based on mathematic statistic methods,we studied the characteristics of the climate change in Xining city with the data of ten-day,monthly and annual temperature,precipitation and hours of sunshine.The results showed that temperature and precipitation both increased during the almost forty-five years in Xining city.The raising rate in temperature and precipitation respectively was 0.01℃/10a,15.68mm/10a.The hours of sunshine apparently reduced.The falling rate was 86.52h/10a.The mean annual lowest temperature was evidently rising.The rate was 0.33℃/10a.The mean annual highest temperature was totally decreased,the rate was-0.05℃/10a.Seasonal variations showed that largest amplitude of temperature appeared in winter and its trend was fluctuated and raised.Precipitation concentrated in summer,it occupied by 57.22 of the total year.Precipitation during whole four seasons increased;moreover,its rising amplitude was the largest in summer.Although the hours of sunshine in four seasons were fallen,the reduction rate was different.Its value was larger in winter and spring.In a word,there experienced cold-arid,warm-arid and cool-wet stages in climate of Xining city during the present forty-five years.At present,there is lying in cool-wet stage.Its climate may transfer to warm-arid stage in the near future.This need to be further certified.