内蒙古新巴尔虎左旗降水气候特征分析

Analysis on Precipitation Climate Characteristics of New Barag Left Banner in Inner Mongolia

根据1961—2010年新巴尔虎左旗国家基本气象站降水资料，采用线性趋势分析、重现期分析、变率分析、距平分析等方法，研究新巴尔虎左旗的降水特征。结果表明，50年来新巴尔虎左旗平均降水量为271．8mm，年平均降水日数为140d，年最大降水量590．5mm年最小降水量125.7mm，夏秋季降水较多，冬春季降水较少；新巴尔虎左旗50年的降水总体为波动中减少的趋势，降水总趋势以～0．69mm／10a变化率减少，春、冬季降水分别以0．60、0．90mm／10a变化率增多，夏、秋季降水分别以-0．20、-0．18mm／10a变化率减少。

According to national basic weather stations precipitation data in New Barag Left Banner during 1961 -2010, using linear trend analysis, return period analysis, variable rate analysis, anomaly analysis, the precipitation features of the New Barag Left Banner were studied. The results showed that the average precipitation is 271.8 mm, annual average precipitation days is 140 days, annual maximum rainfall is 590.5 ram. Annual minimum rainfall is 125.7 mm, more precipitation in summer and autumn, less rainfall in winter. The rainfall in New Barag Left Banner in 50 years declined in the overall for fluctuations, precipitation trend reduced with O. 69 mm every 10 years. The rainfall in spring and winter increased by O. 69, 0.90 mm/10a, respectively; summer and autumn rainfall decreased by -0.20, -0.18 mm/10a.