夏津县降水量变化特征分析

摘要

Based on the meteorological bureau artificial rainfall observation datas of Xiajin County from 1961 to 2010,the variation characteristics of the precipitation amount of the year,season,month and sudden change were analyzed. The results showed that there was a decreasing trend of the precipitation in nearly 50 years. The variation of the precipitation was unstable,decrease rate was-2.3 mm/a. The most obvious trend of decreasing appeared in July and August. The annual precipitation amount mutation analysis was carried out based on cumulative anomaly curve .The results showed that the annual precipitation suddenly changed in 1977.%利用夏津县气象局1961-2010年人工观测雨量资料，对降水量的年、季、月变化特征和突变等气候变化做了较全面的分析。结果表明：近50年来，年降水量呈现减少趋势，且具有波动性增减的变化，减少速率为-2.3 mm/a，7、8月减少趋势最明显。采用累积距平曲线对年降水量进行突变检验表明，年降水量在1977年发生一次突变。