Study on Temporal and Spatial Characteristics of Climate Variation in Hebei Area during 1956-2007

[Objective] The research aimed to study temporal and spatial characteristics of climate variation in Hebei area during 1956-2007.[Method] Based on the data from 23 weather stations evenly distributed over Hebei area(included Beijing and Tianjin) during 1956-2007,by using statistical analytic method,the temporal and spatial variation characteristics of main meteorological factors(temperature and precipitation,etc.) in the area were analyzed.The variation fact and evolution rule of climate in the area in 52 years were discussed.[Result] In Hebei area during 1956-2007,the annual and four-season temperatures both presented fluctuation rise trend.The temperature increment in winter was the maximum,contributing the most to the annual temperature elevation in this area.The temperatures in the whole district all presented rise trend,and the variation difference had regularity.The annual and four-season rainfalls both had large fluctuation amplitudes,following different linear variation trends.The annual rainfall overall presented fluctuation decrease trend.The spatial difference of rainfall variation was significant.The rainfalls in the whole district all presented decrease trend.The decrease amplitude presented low-high-low pattern from the northeast to the southwest.The potential evaporation over the whole district was the highest in the 1960s,and decreased ever since instead of increasing with the temperature.The potential evaporation of each season also presented decline trend.Except in Fengning,Weixian and so on,the evaporation of other stations in the whole district all presented decline trend.The relative humidity slightly decreased with time,with the exception of Chengde,Qinhuangdao and Nangong.The sunshine hours had a clear decrease trend.[Conclusion] The research provided scientific basis for realizing regional sustainable development,improving ecological environment and improving people's quality of life.