海河流域降水时空演变特征及其驱动力分析

选取海河流域35个气象站点1961-2018年逐日降水数据,采用创新趋势分析法、Mann-Kendall非参数检验法和Pettitt突变检验法综合分析了海河流域不同量级降水量的时空演变特征,并采用交叉小波探究了太阳黑子和大气环流异常因子对年降水量的影响.结果表明:1961-2018年海河流域降水整体上呈现出减少趋势,其...

Spatial-temporal change characteristics and driving forces of precipitation in the Haihe River Basin

Based on the daily precipitation data of the 35 meteorology stations in the Haihe River Basin from 1961 to 2018, this study analyzed the spatial-temporal characteristics of the precipitation in different magnitudes in the Haihe River Basin by the methods of innovative trend analysis, the Mann-Kendall nonparametric test and the Pettitt test. The influences of sunspots and anomalous atmospheric circulation factors on the precipitation were explored using the cross wavelet analysis method. The results showed that, from 1961 to 2018, the precipitation in the Haihe River Basin shows a decreasing trend. The decreasing trend of light precipitation is not significant and the change of heavy precipitation shows a decreasing trend of more than 10%. Precipitation in spring and autumn has an increasing trend, while that in summer and winter shows a decreasing trend. The precipitation declines from the south to the north. The spatial-temporal change characteristics of summer and annual precipitation in the Haihe River Basin are similar. Due to topographic factors, it is rainy in front of the mountain, which is bounded by Taihang Mountains and Yanshan Mountains. In spring and autumn, more precipitation is in the south and less precipitation in the middle of the Haihe River Basin. Sunspots and anomalous atmospheric circulation factors have exerted strong influences on the precipitation changes. Sunspot has the most significant effect on the precipitation, followed by AO and ENSO, and PDO has the weakest effect.