京津冀1961~2012年降水量时空分布特征
The Temporal-Spatial Variation Characteristics of Precipitation in Beijing-Tianjin-Hebei during 1961-2012

利用1961~2012年京津冀地区86个气象站逐日降水资料，通过数理统计、趋势分析等，分析了京津冀降水量的时空演变特征。结果表明：京津冀年降水量空间分布不均，降水量的大值中心位于冀东平原地区；京津冀年降平均水量变化呈减少趋势，但减少的幅度各不相同；1961年以来，各季节降水量的变化表现为春、秋两季为增加趋势，且秋季增加幅度大于春季增加幅度，夏季为减小趋势，冬季降水变化趋势不明显。

Abstract: Based on the 76 weather stations daily precipitation data of Beijing-Tianjin-Hebei region from 1961 to 2012, through mathematical statistics, trend analysis, etc., this paper analyzed the spatial and temporal evolution of Beijing-Tianjin-Hebei precipitation. The results showed that the spatial distribution of precipitation of Beijing-Tianjin-Hebei was irregular, and the great value center was located in Jidong plain region; the precipitation of Beijing-Tianjin-Hebei showed a trend of decrease, but the range of decrease was not the same. Since 1961, the precipitation in spring and autumn showed a increase trend, and the range in autumn was greater than that in spring. The precipita-tion in summer showed decrease trend, and the precipitation in winter had no significant changes. 

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