摘要
采用创新趋势分析(ITA)方法对1961年至2018年宁夏不同强度降水的时空变化进行研究。结果表明,区域年降水量增加主要是弱降水增加,而区域年降水量减少主要是强降水减少;极端降水的变化趋势明显。不同类型极端降水的贡献随季节变化。春季区域降水增加主要是强降水增加,区域降水减少主要是弱降水减少。夏季和秋季区域降水增加主要是弱降水增加,而区域降水减少是由强降水减少引起。该研究结果为水资源规划和应对干旱和洪涝灾害提供了支持。
Based on daily rainfall data from 26 station records,spatial and temporal variations in annual and seasonal precipitation of different rainfall intensities from 1961 to 2018 in Ningxia,China are investigated using the innovative trend analysis(ITA)method.The results show that annual precipitation increases on the northern plain but decreases in the southern mountainous area.The increase in regional annual precipitation is mainly due to an increase in weak precipitation,while the decrease in regional annual rainfall is a result of a reduction in heavy precipitation.Lowintensity precipitation shows an upward trend,while high-intensity precipitation shows a downward trend.The variation trend of extreme precipitation is more obvious.The contributions of different types of extreme precipitation vary by season.During spring,the increase in regional rainfall is mainly caused by the increase in heavy precipitation,while the decrease in regional precipitation is mainly caused by the decrease in weak precipitation.During summer and autumn,the increase in regional precipitation is caused by the increase in light precipitation,while the reduction in regional rainfall is caused by the decrease in heavy precipitation.This study provides support for water resources planning and addressing droughts and floods.
基金
This study was supported by the National Key Research and Development Plan of China[Grant No.2016YFE0201900-02]
the National Natural Science Foundation of China[Grant Nos.41575037 and 41205099]
the National Basic Research Program of China[973 Program,Grant No.2014CB441403]
Guizhou Province Scientific Research Joint Project[Grant No.G[2013]4001].
