1965—2015年辉县市降水变化特征
Temporal Changes in Precipitation Characteristics of 1965 to 2015 in Huixian
中文摘要：
使用河南省辉县市1965—2015年日降水数据，利用线性倾向估计法和Mann–Kendall法分析了年、季以及不同强度的降水量和降水日数的长期变化趋势，并检验其突变特征。结果表明，辉县市年均降水量为577.8 mm，年平均降水日数为73.6 d，均呈下降趋势，其下降速率分别为平均1.3 mm/10 a和0.7 d/10 a。各季节中，夏季降水量和降水日数所占比重最大，冬季最小，但夏季降水量和降水日数均呈减少趋势，而冬季降水量和降水日数均呈增加趋势。春秋两季的降水量呈增加趋势，降水日数呈减少趋势。各不同降水强度中，中雨降水量所占比重最大，大雨和小雨紧随其后，三者差异较小。小雨降水日数占比重最大，但呈显著减少趋势。中雨降水量及其降水日数呈增加趋势，其他强度的降水量和降水日数均呈减少趋势。
中文关键词：
日降水，降水日数，降水强度，辉县市
KeyWords：
daily precipitation, precipitation days, precipitation intensity, Huixian
Abstract：
Based on the daily precipitation data of Huixian from 1965 to 2015, long-term trends of precipitation amount and day of precipitation with different intensities over years and seasons were analyzed by using linear tendency estimation and Mann- Kendall methods. Their abrupt change characteristics were also tested. The results showed that the average annual precipitation in Huixian was 577.8 mm and the average number of annual precipitation days was 73.6. Both showed a decreasing trend at rates of 1.3 mm/10a and 0.7 d/10a, respectively. In each season, the proportion of summer precipitation and precipitation days were the largest and those in winter were the smallest. While precipitation amount and precipitation days showed a decreasing trend for summer, those showed an increasing trend for winter. For spring and autumn, precipitation amount showed an increasing trend and precipitation days showed a decreasing trend over year. Among the different precipitation intensities, the proportion of moderate rain accounted for the largest, followed by heavy rain and light rain, where little difference existed. The proportion of light rain days was the largest, but it showed a significant decrease trend. The amount of moderate rain and its precipitation days showed an increasing trend, while the precipitation amount and precipitation days of other intensities showed a decreasing trend.