1960一2021年内蒙古高温干旱复合事件特征分析

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中图分类号：P426.6 文献标志码：A文章编号：1673-9868（2025）05-0164-13

DOI： 10. 13718/j. cnki. xdzk. 2025. 05. 014

Analysis of Characteristics of Compound High Temperature and Drought Events in Inner Mongolia from 1960 to 2021

LIU Hongyu1'²， HAI Quansheng²， LIU Meiping²， CHANG Fei²

1.College of Geographical Sciences，Inner Mongolia Normal University，Hohhot O10022，China； 2.College of Ecologyand Environment，Baotou Teachers’Colege，Inner Mongolia Universityof Science and Technology，Baotou InnerMongolia 014030，China

Abstract： Inner Mongolia，as an important ecological security barrier in northern China，is under a serious threat of high temperature and drought compound events，which have become an important risk affecting the stability and sustainable development of the regional ecosystem. Using the standardized precipitation index and standardized temperature index by 100 meteorological stations from l960 to 2021，the characteristics and return periods of summer heat and drought compound events were studied using the Copula function. The results show that： ① In the term of time，the frequency of heat and drought compound events showed an increasing trend during 1960-2021 ，turned to be dominated by heat rather than drought，and the frequency of semi-arid areas was higher than that of arid and semi-humid areas after 2000. ② In the term of space，the central region of Chifeng City and the western region of Hulun Buir were the high-frequency areas for compound events，while the southern region of Chifeng，the eastern region of Hinggan League，Tongliao，and Xilingol League were the medium-frequency areas. ③ In arid and semi-arid areas，the Copula function is mainly the BBl type，while in sub-humid regions，it is primarily the Joe type. ④ The return periods for‘mild-mild’‘moderate-moderate’‘severe-severe’and‘extreme-extreme’composite events are 7 years，2O years，1OO years，and 5OO years，respectively. The longest return periods for composite events are observed in semi-humid regions， followed by arid regions，and then semi-arid regions.

Key words： drought; high temperature; Copula function; return periods; Inner Mongolia

干旱不仅破坏生态环境，还极大地阻碍经济社会的可持续发展[-2]。（剩余11947字）