【摘要】 利用1961—2010年陕西省78个气象观测站的逐日最高温度、最低温度、平均温度以及日降水量资料,采用趋势分析方法对该地区极端气候事件的变化进行了分析。结果表明:①近50a来陕西降水极端事件没有显著的增减变化趋势,但存在明显的阶段性。②近50a来区域严重干燥事件在显著增加而严重湿润事件趋于减少,2000年以后严重干湿事件均偏多,区域降水有向不均衡、极端化发展的趋势。③区域年极端高(低)温事件在近50a来呈现显著的增加(减少)趋势,其空间分布具有较好的一致性。极端温度事件的变化在各季节存在差异,冬、春季变暖的趋势比较显著。在显著变暖的20世纪90年代以后,相对于降水极端事件,温度极端事件显现地更为突出。更多还原

【Abstract】 Based on daily maximum temperature,daily minimum temperature,daily mean temperature and daily precipitation from 78 weather stations in Shaanxi Province from 1961 to 2010,the changes of extreme climate events in Shaanxi Province were analyzed by trend analysis method.Results showed that:(1) In the recent 50 years,there was no significant variation trend in rainstorm days and extreme precipitation events,but there was significant stage variation for the extreme precipitation events.(2) The number of severe drought events increased and the number of severe wet events decreased during the 50 years.The severe drought events and wet events were relatively more than normal level after 2000.Precipitation became uneven and extreme.(3) The extreme high temperature events increased and the extreme low temperature events decreased,and their spatial distributions of the extreme temperature events were consistent.The changes of extreme temperature events were more significant in winter and spring than in summer.Since global warming in 1990s,the extreme temperature events are more prominent than extreme precipitation events.更多还原