Compound high-temperature and drought events is one of the complex extreme climate events with high incidence in the Shiyang River Basin,which has more serious impact on industrial and agricultural production and ecological environment than a single extreme climate event.Based on the average temperature,maximum temperature and precipitation data of five meteorological stations in the Shiyang River Basin from 1961 to 2023,the compound high-temperature and drought events were identified and determined using percentile threshold method and Ped meteorological drought index,and spatial and temporal evolution characteristics of compound high-temperature and drought events were analyzed with linear trend method.The results show that the spatial difference of annual average frequency of compound high-temperature and drought events was small in the Shiyang River Basin,however,the spatial difference of compound high-temperature and drought events frequency was obvious in each decade and increased decade by decade.Annual frequency of compound high-temperature and drought events decreased first and then increased in the Shiyang River Basin,it decreased before 1996 and then increased in the whole basin.Compound high-temperature and drought events mainly occurred from June to August,and the most occurred in July.The frequency of compound high-temperature and drought events with different grades changed greatly,with the increase of drought grade,the frequency of drought increased first and then decreased,the frequency of medium drought was the highest,and the frequency of extreme drought was the least.
the Shiyang River Basincompound high-temperature and drought eventsmeteorological drought indexidentificationevolution characteristics
NETL
NSTL
万方数据
