Analysis of the variation characteristics of compound drought heatwave events during the warm season in Inner Mongolia from 1980 to 2020
To enhance the monitoring of compound drought and heatwave events(CDHEs),Inner Mongolia was selected as the study area.Based on data from 115 stations,the drought and heatwave events in this region were defined and identified using the Standardized Precipitation Evapotranspiration Index and the high-temper-ature relative threshold method.On this basis,a Compound Drought and Heatwave Magnitude Index(CDHMI)was constructed to statistically analyze the Compound Drought and Heatwave Frequency(CDHF),and then a study on the spatiotemporal variation characteristics of droughts,heatwaves,and CDHEs was carried out.The results show that during the warm season(May to October),the intensity of droughts at different time scales(1-month and 6-month scales)is increasing.The western part of Inner Mongolia and the central part of Tongliao City are prone to frequent droughts,and the frequency of droughts in the central and eastern regions has signi-ficantly increased.The frequency of heatwaves has significantly increased,and the period of heatwaves has been significantly extended,with the duration and intensity of heatwaves showing a non-significant increasing trend.The frequency,duration,and intensity of heatwaves generally show a spatial distribution pattern of be-ing higher in the west and lower in the east.The frequency and intensity of CDHEs have shown a significant increasing trend,especially after 1998.Spatially,high values of CDHF are concentrated in the Xilingol League and Hulunbuir City,with a significant increase in CDHF in the northern region of Inner Mongolia,while high-intensity CDHMI is distributed in the northeastern and southwestern regions of Inner Mongolia,with a growth trend similar to that of CDHF.
Inner Mongoliacompound drought heatwave eventsdroughtheatwavescompound drought heatwave magnitude index
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