摘要
利用1961—2014年中国月降水和月气温观测资料,选择常用的标准化降水指数(SPI)及标准化温度指数(STI)识别复合高温干旱事件,通过计算其发生频率和空间发生面积,分析了近54 a中国及七个子区域夏季复合高温干旱事件的时空分布特征及变化趋势。结果表明:除青藏高原及新疆部分地区以外的中国大部分区域为复合高温干旱事件的高发区。在趋势变化上,1988—2014年间中国大部分地区复合高温干旱事件的发生频率趋于增加(与1961—1987年相比),尤其是华北地区增幅较大(282.79%~682.48%);华中、华东以及西北部分地区趋于减少,其中华中地区减少相对明显。此外,1961—2014年全国复合高温干旱事件的空间面积显著增加,增长速率为(0.02~0.03)/10 a,且20世纪90年代以后增加趋势更为明显;区域上,华北、东北、华南、西南及西北等地区呈增加趋势,而华中和华东地区变化趋势不明显。
Based on the observation data of monthly precipitation and temperature in China from 1961 to 2014, standardized precipitation Index(SPI) and Standardized Temperature Index(STI) are selected to identify compound hot and dry events. This study explores the distribution and trends of compound hot and dry events during summer from 1961 to 2014 over the mainland and seven sub-regions of China by calculeting the occurrence fiequency and area of the events. Results show a high frequency of compound hot and dry events in most parts of China except for Qinghai-Tibet plateau and parts of Xinjiang province. An increasing trend in the frequency of compound hot and dry events for the period 1988—2014 relative to 1961—1987 has been observed across most regions, especially in northern China(about 282.79%~682.48%). Certain regions in the central, eastern, and parts of northwestern China show a decreasing trend with significant decreases in central China. Additionally, a significant increase in the spatial extent of compound hot and dry events in China has been detected, with a rate of about(0.02~0.03)/decade, especially since the 1990 s. The north, northeast, southern, southwest, and northwest China shows an increase in the spatial extent while the central and eastern parts show an insignificant trend.
作者
武新英
郝增超
张璇
郝芳华
WU Xinying;HAO Zengchao;ZHANG Xuan;HAO Fanghua(College of Water Sciences,Beijing Normal University,Beijing 100875,China)
出处
《水利水电技术（中英文）》
北大核心
2021年第12期90-98,共9页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(41601014)。
