天津市降水量及蒸发量变化趋势研究

Study on change trend of precipitation and evaporation in Tianjin

降水和蒸发是水循环过程中两个重要环节。本文采用线性滑动平均法和Mann-Kendall非参数检验法,对天津市年、季降水量及蒸发量进行趋势分析,结果表明:天津市近50年年降水量及蒸发量下降趋势不显著,夏季降水量下降趋势显著,春季和冬季蒸发量上升趋势不显著。

Precipitation and evaporation are two important links in the process of water cycle. Linear moving average method and Mann-Kendall nonparametric test method are adopted in the paper for analyzing the trend of precipitation and evaporation in Tianjin from two duration of one-year and one-quarter. Results show that precipitation and evaporation in Tianjin shows insignificant decrease trend in recent 50 years. The summer precipitation is significantly declined,and evaporation does not have significant upward trend in spring and winter.