山西黄土高原近50年来气候暖干化研究

根据山西省4个具有代表性的气象站点自建站以来到2005年的降水量与气温资料,应用线性回归与趋势分析方法,研究了山西黄土高原近50年来的气候变化。研究得出:山西省近50年来气候总体上具有暖干化的特征,年平均气温呈波动上升趋势,其增长率为0.032℃/a,高于全球近百年的平均值(0.005℃/a),也明显高于陕甘宁地区近50年来的平均值(0.0194℃/a);最冷月(1月)比最热月(7月)增温速率高;年平均气温以70年代中期为界,将山西省气候分为冷、暖两个时期,前为冷期,后为暖期;年平均降水量呈波动减少趋势,其减少率为1.635mm/a;年平均降水量同样以70年代中期为界,之前为相对丰水期,之后为相对枯水期。

Study on Warming and Drying Climate of Shanxi Loess Plateau in Recent 50 Years

Climatic change of the Loess Plateau of Shanxi were analyzed by using the precipitation and temperature data of four representative weather stations from their establishment to 2005 in Shanxi and applying linear regression and trend analysis method.The result indicated that the character of climate in Shanxi was becoming warmer and drier for recent 50 years,and the average annual temperature is rising with a rate of 0.032℃/a,which is higher than the global average temperature(0.005 ℃/a)in the past one hundred years as well as Shaanxi-Gansu-Ningxia region average temperature(0.0194℃/a)in recent 50 years.The coldest monthly(January) was higher than the hottest month(July) in the aspect of increasing temperature;Shanxi Province will be divided into cold period and warm period,before the mid-1970s called a cold period,after it called a warm period;the average annual precipitation is reducing with a rate of 1.635mm/a,similarly before the mid-1970s called a relatively wet period,after called a dry period.