西峰区降水特征及变化规律--测试文章

利用1960—2010年的逐月降水资料分析了西峰区降水的变化趋势以及突变情况，采用M-K检验法和滑动t检验法分析了西峰区降水量的突变情况。结果表明：降水量总体上呈下降趋势，下降趋势主要由秋季降水量减少引起；年降水、春季降水以及秋季降水分别在1984、1993、1976年发生了一个由多到少的突变，冬季降水在1970年和2000年发生由少到多的转变,汛期降水分别在1986年和1988年出现了由多到少和由少到多的突变。

Characteristics and variation trend of precipitation in Xifeng

Based on the monthly precipitation data from Xifeng weather station between 1960 and 2010, the variation characteristics and trend of precipitation in Xifeng were analyzed. The results indicated that the overall annual precipitation was apparently in a decrease trend which was mainly caused by reduction of autumn precipitations. The changes were examined by methods including Mann-kendall test and moving t-test. The results found that clear abrupt change points in 1984, 1993 and 1976 could be detected. From then on, the annual precipitation, spring precipitation and autumn precipitation began to decline respectively. However, the winter precipitation began to ascend during 1970-2000, and precipitation during flood period began to decline from 1986 but ascend from 1988.