气候变化背景下赣江流域复合高温干旱事件时空演变特征OA北大核心CSTPCD

[Objective]The frequency and intensity of compound hot-dry events are showing an increasing trend in multiple regions globally under the climate change.To provide references for disaster risk prevention in the Ganjiang River Basin,[Methods]daily maximum temperature and surface soil moisture data from 1961 to 2021 were used to assess the spatiotemporal variations of heatwaves,agricultural drought,and compound hot-dry events in the Ganjiang River Basin.Comparative analysis was conducted to identify the differences in characteristics between compound hot-dry events and individual extreme events.[Results]The result indicate that the frequency of agricultural drought events in the Gan River Basin shows a decreasing trend(-0.027 events/10 a),while the frequency of heatwave events and compound hot-dry events exhibits an increasing trend(0.084 events/10 a,0.013 events/10a).A comparison between the periods of 1961-2000 and 2001-2021 reveals that the frequency of agricultural drought occurrences has decreased in most northern areas but increased in most southern areas.The fre-quency of heatwave has shown an increasing trend across the entire basin,while the frequency of compound hot-dry events has decreased in the northeast and significantly increased in the south.Furthermore,compared to individual heatwave and agricultural drought,the duration and intensity of heatwave under compound hot-dry events have increased by 16.87％and 26.25％respec-tively,and the duration and intensity of agricultural drought have increased by 10.65％and 26.86％respectively.[Conclusion]The frequency of compound hot-dry events has significantly increased in the southern part of the Ganjiang River Basin,and com-pared to individual extreme events,the hazard of compound hot-dry events has been enhanced,indicating that the region's capac-ity for preventing the risks associated with compound hot-dry events should be strengthened in the future.