安徽省江淮地区1980-2018年降水量时空分布变化分析

Analysis of Temporal and Spatial Distribution of Precipitation in Jianghuai Region of Anhui Province from 1980 to 2018

基于安徽省江淮地区1980—2018年期间9个气象站点的实测降雨资料,采用Mann-Kendall法、Arc GIS软件克里金插值技术等分析该地区降水量年际、季节以及空间变化特征。结果表明:安徽省江淮地区降水量年际变化较大,总体呈上升趋势但未出现显著变化;春、夏、冬三季总体呈上升趋势,而秋季总体呈下降趋势;春、夏、秋三季降水量整体变化不显著,冬季降水量整体波动较大,上升趋势显著;季节分布不均匀,夏季降水量全年占比最大。各站点之间春季和夏季的降水量差异较大,年降水量均呈现由西南至东北逐渐减少,且呈梯度变化。

Based on the measured rainfall data from 9 meteorological stations in the Jianghuai region of Anhui Province from 1980 to 2018,the Mann-Kendall method and the Arc GIS software Kriging interpolation technique were used to analyze the interannual,seasonal and spatial variation characteristics of precipitation in the region.The results show that:the inter-annual variation of precipitation in the Jianghuai region of Anhui Province is large,and the overall trend is upward but there is no significant change;the three seasons of spring,summer and winter generally show an upward trend,while the autumn generally shows a downward trend;the overall change of precipitation in spring,summer and autumn is not significant,and the overall fluctuation of precipitation in winter is relatively large,with a significant upward trend;the seasonal distribution is uneven,and summer precipitation accounts for the largest proportion of the year.The precipitation in spring and summer varies greatly among the stations,and the annual precipitation decreases gradually from the southwest to the northeast with a gradient change.