宁夏固原50a气候变化特征分析

依据宁夏固原市基准站50a（1957--2006年）的温度、降水量、日照时间、蒸发量等地面气象观测资料，对固原市50a的气候变化特征进行分析．结果表明，平均温度经历了低于平均值0．2℃和0．5℃的偏冷期和寒冷期，温度在近20a中以0．09％／a的速度在变暖，平均温度、平均最高温度和最低温度变化呈正相关．50a来降水量以18．9mm／10a的速度减少．年日照时间和蒸发量呈现正相关的对应关系．

Signature analysis of Climate Change in Guyuan of Ningxia in recent 50 years

According to meteorological observation records information of Base station of Guyuan City in recent 50 years, which is temperature, precipitation, sunshine, evaporation and other surface meteorological on the Guyuan City, the climate change feature was analyzed. The results show that the average temperature experienced a lower cold period and the cold period with average temperature of 0.2 ℃ and 0.5 ℃ below. In the past 20 years, it is warming with 0.09 ℃/a, average temperatures and average maximum temperature was positive correlation to the minimum temperature. Amount of precipitation reduced with 18.9 mm/10a. Annual sunshine duration was positive correlation to evaporation capacity.