Analysis on features of summer extreme high temperature in eastern China
By using the daily maximum temperature data from 449 meteorological stations over eastern China,and with trend analysis method,the spatial and temporal variation characteristics of the extreme high temperature days and the continuous high temperature days in summer during 1960-2012 were investigated.Results show that both the two high temperature indices over northern China,southern China and Hangzhou Bay surrounding areas increase significantly,while over the central regions between the Yangtze River and Yellow River,they both consistently decrease.However,in lower reaches of the Yangtze River,the extreme high temperature days increase significantly while the continuous high temperature days decrease.As far as seasonal features are concerned,the two indices mainly concentrate in June and July over the north of the Huaihe river and in July and August over the south of the Huaihe river.Furthermore,the two indices in each region demonstrate significantly negative correlation with the precipitation days,but obvious differences exist between the North China and South China.The negative correlation is significant in relation to the interannual variability and 5a decadal scale,while in central regions,it merely belongs to interannual scale.The correlations between the continuous high temperature days and the precipitation days over Hangzhou Bay and South China are found only on 5a decadal scale.In North China,the significant increasing of the extreme high temperature events is closely related with the decreasing rainy days and precipitation amount.The variations of the two indices in Southeast China can be explained by the significantly westward extending of the Northwest Pacific subtropical high.
TemperatureExtreme high temperatureIntraseasonal distributionSouthern China
国家科技期刊平台
NSTL
万方数据
维普
