摘要
利用西南地区90个气象台站1970-2010年逐日最高和最低温度资料,采用世界气象组织(WMO)定义的极端温度指数分析了西南地区近41a极端温度事件的时空变化、突变及周期特征.结果表明:近41年来在西南地区暖日数与冷日数具有较好的局部对称特征,暖夜数与冷夜数具有较高的对称性.暖指数近41年均表现为增多的趋势;冷指数主要为减少的趋势.暖日数与冷夜数分别在2004年与1994年前后发生了1次明显突变,冷日数突变出现在1997年,仅暖夜数未发生突变.暖指数与冷指数的周期振荡并不完全一致,但均存在1个4年的周期振荡.
Based on the maximal/minimum daily temperature data of 90 meteorological stations in South- west China during 1970--2010 and 4 extreme temperature indices defined by the world meteorological or- ganization, F test, Mann-Kendall test and wavelet analysis were made to analyze the temporal and spatial distributions of extreme temperature events in Southwest China in the 41 years. The results indicated that in the 41 years, hot days and cold days were basically symmetrical in local places, while hot nights and cold nights were symmetrical in most areas. In the recent 41 years hot extreme indices showed a significant increasing trend, while cold extreme indices showed a significant decreasing trend. There were significant mutations of hot days and cold nights around 2004 and 1994, respectively; a mutation of cold days oc- curred in 1997; while no mutation was observed in the number of hot nights. The periodic oscillation of hot extreme indices and cold extreme indices were not the same, but both of them showed a four-year periodic oscillation.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第5期161-167,共7页
Journal of Southwest University(Natural Science Edition)
基金
国家自然科学基金项目"青藏高原夏季风与东亚夏季风的相互关系研究"(41275079)
国家自然科学基金项目(41405069)
国家青年科学基金项目:青藏高原绕流系统对我国天气气候的影响(41305077)
关键词
西南地区
极端温度
变化趋势
Southwest China
extreme temperature
variation trend
