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中文摘要：
根据天津市13个气象站近50年的实测月降水资料,运用回归分析、趋势分析和5年滑动平均等方法,分析了天津市近50年来降水变化特征。结果表明：天津市降水量年内分配不均,主要集中在7-8月份,占全年降水量的53.98%-60.64%;天津市年降水波动较大,极差在470.00-944.80之间;20世纪70年代是近50年来天津市年降水量最多的十年,80年代以来,年降水量持续减少,尤其是二十一世纪以来,年降水量显著减少;天津市年降水量总体上呈减少趋势,各站平均下降率为22.97mm/10 a。
英文摘要：
Based on the monthly precipitation data of thirteen meteorological stations in Tianjin in recent 50 years, using regression analysis, trend analysis and five -year moving average method, the change characteristics of precipitation were analyzed. The results showed that annual distribution of precipitation was uneven, mainly concentrated in July and August, accounting for 53.98% -60.64% of the annual precipitation; the fluctuation of the mean annual precipitation was big, between 470.00 - 944.80mm; the annual mean precipitation of 1970s was the most; since 1980, the mean annual precipitation had reduced continually, especially since 2000; over the past 50 years, there was a decreasing trend of 22.97mm/10a.
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