内蒙古复合干旱和热浪事件特征及其归因OA

Under the background of global climate warming,compound drought and heatwave events(Com-pound Drought and Heatwave,CDHW)are having a profound impact various regions worldwide with increasing frequency,intensity,and duration.Based on the daily temperature and precipitation data from 1961 to 2021 in Inner Mongolia,we employed a daily-scale standardized index to identify different CDHW events in the study ar-ea.Subsequently,we analyzed the temporal and spatial evolution characteristics and influencing factors of vari-ous CDHW events using climate tendency rate,partial correlation analysis and geographic detectors.The results show that:the duration,frequency,drought intensity and heatwave intensity of the four types of CDHW events in Inner Mongolia from 1961 to 2021 increased gradually from the southwest to the northeast;The characteristic indicators of the four types of CDHW events exhibited an upward trend,with significant increases observed in the intersection type(d-and-h)and the heatwave conditioned on droughttype(h-cond-d)events;The correlation be-tween precipitation and the changes in the four types of CDHW events was found to be high,with over 97%of the significance tests indicating a significant relationship;Soil type and downward shortwave radiation at the sur-face were identified as the main driving factors for the duration and frequency of different types of CDHW events.Moreover,the interaction between various driving factors showed an enhanced explanatory power for du-ration and frequency,with a greater impact observed on duration.