Analysis of causes and precursor signals of persistent heat waves in Guangxi in July 2023
Based on the daily maximum temperature from 91 weather stations in Guangxi and reanalysis data from NCEP/NCAR,outgoing longwave radiation data from NOAA,and 130 circulation indexes from National Climate Center in China,the causes of high temperature weather process in Guangxi in July 2023 were analyzed,and their precursor signals were explored.The results showed that there were two widespread high-temperature weather processes in Guangxi during 9-16 and 22-29 July,2023 in Guangxi.The average number of high-temperature days in Guangxi was 12,which is the 3rd greatest during the same period since 1951.Guangxi was controlled by the western peripheral sinking air flow of tropical cyclones.During the two processes,the western Pacific subtropical high was strong,with its position expanding north-westerly,and the South Asian High also has shown an abnormally eastward extension.The effect of anomalous subsidence and warming controlled by the deep high-pressure system leaded to the development of persistent heat waves in Guangxi in July 2023.The warm pool SST index in the tropical western Pacific Ocean in March-April is significantly positively correlated with the number of high temperature days in Guangxi in July,which can be used as a reliable preceding signal of persistent heat waves in July in Guangxi.
high temperaturesubtropical hightropical western Pacific warm poolSST
国家科技期刊平台
NSTL
万方数据
