摘要
干旱和极端高温事件会对人类社会和生态环境造成严重影响,当两种极端事件同时发生时会造成更大的威胁。本文利用1961-2020年网格化的月值降水和气温数据,计算标准化降水蒸散发指数(SPEI)和标准化温度指数(STI),在界定复合事件的基础上分析不同干热阈值下中国东北地区复合高温干旱事件的时空演变特征,探究复合事件的空间相关性。结果表明,中国东北地区复合高温干旱事件发生频率在空间分布表现出东部及东南部低、西部及西北部高的特点;分析复合事件的历史演变发现Mi-Mi以0.02/a速率上升,且在20世纪90年代之后大幅度升高;总体复合事件影响面积呈现显著的上升趋势,幅度为1.02%/a,不同类型复合事件影响面积均显著升高且在20世纪90年代大幅度上升达到峰值;复合事件的高频区聚集在西部和西北部,低频区聚集在东南部及东部。研究成果可为东北地区防灾减灾、农业规划、水资源配置等提供参考。
Drought and extreme heat events have serious societal and environmental impacts that are greatly amplified when both events occur simultaneously.In this paper,the standardized precipitation evapotranspiration index(SPEI)and standardized temperature index(STI)were calculated by using the gridded monthly precipitation and temperature data from 1961 to 2020.Based on the definition of composite events,the spatial and temporal evolution characteristics of composite high temperature and drought events in Northeast China under different dry heat thresholds were analyzed,and the spatial correlation of compound events was explored.The results showed that the frequency of CHDEs in Northeast China is low in the east and southeast and high in the west and northwest.During the study period,the historical evolution of the CHDEs found that Mi-Mi increased at a rate of 0.02/a,and increased significantly after the 1990 s.The impact area of the overall CHDEs types showed a significant upward trend,with a range of 1.02%/a.The area affected by different types of CHDEs increased significantly and peaked in the 1990 s.The high frequency areas of the compound events are concentrated in the west and northwest,with the low frequency areas concentrated in the southeast and east.The research results provide a reference for disaster prevention and mitigation,agricultural planning,and water resource allocation in Northeast China.
作者
张雪玲
朱美琪
李颖
ZHANG Xueling;ZHU Meiqi;LI Ying(School of Geographical Sciences,Liaoning Normal University,Dalian Liaoning 116029,China)
出处
《河北省科学院学报》
CAS
2024年第1期1-10,共10页
Journal of The Hebei Academy of Sciences
基金
国家自然科学基金青年项目(42201039)。
关键词
复合高温干旱事件
时空特征
空间相关性
SPEI
STI
Compound heat and drought events
Spatiotemporal characteristics
Spatial autocorrelation
SPEI
STI
