1956-2017年锡林郭勒盟气候变化特征

The characteristics of climate change in Xilingol League from 1956 to 2017

利用锡林郭勒盟8个国家气象站点1956-2017年的气象资料,运用线性回归等统计方法,分析了该区的气候变化特征。结果表明:锡林郭勒盟的年平均气温均值为2.76℃,具有显著的上升趋势,上升速率为0.43℃·(10a)^-1 ,比全国的上升速率高34.38%;锡林郭勒盟年降水量均值为253.86 mm,具有微弱递减趋势,年降水量递减速率约为6.32 mm·(10a)^-1 ,与全球和中国的整体变化趋势相反,该递减趋势未通过0.05显著性水平检验;锡林郭勒盟蒸发皿年蒸发量均值为2 164.75 mm,具有递增趋势,该趋势通过了0.01显著性水平检验,递增速率为10.90 mm·(10a)^-1 ,与全球和中国的整体变化趋势相反;锡林郭勒盟年平均风速均值为3.76 m·s ^-1 ,具有明显的递减趋势,该递减趋势通过了0.01显著性水平检验,递减速率为0.16 m·s^-1 ·(10a)^-1 ,比全国的递减速率略低;锡林郭勒盟的年平均气温、年降水量和年平均风速具有不同尺度的周期,而蒸发皿年蒸发量周期性弱。

Using the meteorological datas from eight national meteorological stations in Xilingol League from 1956 to 2017, the characteristics of climate change in the region were analyzed by linear regression and other statistical methods. The results show that: The mean value of average annual air temperature in Xilingol League was 2.76℃, which had a significant upward trend with an increase rate of 0.43°C ·(10a)^-1 , which was 34.38% higher than the national air temperature increase rate. The average annual precipitation in Xilingol League was 253.86 mm, which had a slight decreasing trend of annual precipitation. However,the decreasing trend did not pass the significant level test of 0.05. The deceleration rate was about 6.32 mm·(10a)^-1 ,which was contrary to the global and national overall change trend. The average value of annual pan evaporation in Xilingol League was 2 164.75 mm, showing a slight increasing trend, which passed the significant level test of 0.01. The ascending rate was 10.90 mm·(10a)^-1 , which was contrary to the global and national overall change trend. The mean value of average annual wind speed in Xilingol League was 3.76 m·s ^-1 ,showing a declining trend, which passed the significance level test of 0.01.The deceleration rate was 0.16 m·s^-1 ·(10a)^-1 , which was slightly lower than the national deceleration rate. The average annual air temperature, annual precipitation, and average annual wind speed of the Xilingol League had periodic patterns of different scales, and the annual pan evaporation’s periodicity was weak.