Spatiotemporal features of extreme high temperature in summer half year in Hetao and its vicinity
Based on the daily maximum temperature data of 81 stations in summer half year in Hetao and its vicinity during 1961 to 2010,this paper calculated the threshold value of extreme high temperature for different stations,and analyzed their spatiotemporal distribution and change trend.The results show that,the threshold value is high in southeast and northwest and low in southwest of Hetao.The consistent and contrary anomaly distribution was the main spatial model of the extreme high temperature frequency.The spatial model in Hetao and its vicinity can be divided into three areas:north of Hetao area,southeast and southwest of the Hetao area.The extreme high temperature frequency displays remarkable increasing tendency in north and southwest of the Hetao area,and displays obvious decreasing tendency in southeast of the Hetao area.The inter-annual changes of the extreme high temperature frequency in north and southwest of Hetao areas are close.The extreme high temperature frequency is on the lower side during 1961-1990,and on the higher side during 1991-2010,and it is contrary in southeast of the Hetao area.The frequency has an obvious fluctuating period of 10-14 years in north and southwest of the Hetao area.The extreme high temperature frequency in summer half year is positively correlated with the average temperature in same period.
extreme high temperaturespctiotemporal variationvariation trendHetao
NETL
NSTL
万方数据
维普
