洮南市54年气候变化特征分析

Climate variation characteristics through 54 years in Taonan city

利用线性拟合、Mann-Kendall等方法对吉林省洮南市54年来的年风速、气温、降水资料进行了倾向等特性分析。结果表明:1961―2014年,洮南市年平均风速线性倾向率约为-0.022 9,Mann-Kendall统计值Z为-6.87,风速呈现减小趋势。风速具有季节性变化特点,春季风速最大,为4.2m/s,其次为秋季和夏季,冬季风速最小。洮南地区的主风能和主风向均为WNW,次主风能为W,次主风向为SSW。54年来年平均气温呈上升趋势,变化倾向率为0.38℃/10a。年平均降水量有减少的趋势。

Based on the methods of linear fitting,Mann-Kendall characteristics of annual wind data,temperature data and precipitation data in Taonan within the 54 years are analyzed.The results show that from 1961 to2014 in Taonan city,the linear trend rate of annual average wind speed is about-0.0229,Mann-Kendall statistics value Z is-6.87 and the wind speed showed a reduction trend.Wind speed has the seasonal variation characteristics.The spring wind speed（4.2m/s） reaches its maximum followed by autumn and summer.The winter wind speed is minimum.In Taonan area,both the prevailing wind power and the prevailing wind direction are WNW.The secondary prevailing wind power is W and the secondary prevailing wind direction is SSW.The results show that the average temperature tend to rise and its variability is 0.38℃ /10 a,but the mean annual precipitation had a decreasing trend.