基于RClim Dex的辽西地区极端气候事件特征分析

Analysis on characteristics of the extreme climate events in western Liaoning province base on RClim Dex

利用1960—2015年辽西地区16个市县站的日值资料,采用极端事件定义方法、Mann-kendall突变检验及滑动t检验分析极端气候指数的时空分布特征。结果表明,极端气温指数中低温指数呈显著下降趋势,高温指数呈显著上升趋势。极端气温事件大多在20世纪80年代末到90年代初期发生突变;极端降水事件中,普通日降水强度指数呈缓慢回升的变化趋势,其余指数均呈下降趋势。普通日降水强度指数略有上升是由于非极端降水强度日数略有升多,但对土壤增墒及空气增湿仍不利。

Based on the daily data of 16 cities and counties in western Liaoning province during 1960 to 2015,spatio-temporal distribution of the extreme climate indices were analyzed by using the extreme event definition method,Mann-kendall test and moving t test.The results showed that low temperature climatic events of extreme temperature indices showed a significant downward trend,while the high temperature climatic events all showed a significant upward trend.Most extreme temperature events occurred in the late 1980 s and early 1990 s.In extreme precipitation events,the normal daily precipitation intensity indices showed a gradual upward trend.This upward trend was due to the number of non-extreme precipitation intensity days increased s,but it was still unfavorable to soil increase and air humidification.