Effects of the Urbanization Process on Temperature in Ji'ning of Shandong Province
By using the temperature data at the weather station of Ji'ning and the other 3 stations in its surrounding counties including Yanzhou,Wenshang and Jiaxiang during 1981-2010,this paper analyzed the trends and characteristics of temperature in the urban and suburbs of Ji' ning.On this basis,the influence of the urbanization development of Ji' ning on temperature was explored further.Results show that the temperature of the urban and the suburbs of Ji' ning in recent 30 years increased by more than 1 ℃ with climatic tendency rate of about 0.35 ℃/10 a and 0.38 ℃/10 a,respectively,and the difference of temperature between the urban and the suburbs reduced gradually.The temperature increments were obvious in winter and spring in both the urban and suburbs,while the smallest in summer.The increments of maximum temperature in the suburbs of Ji ' ning were very close to the urban,but for minimum temperature in suburbs,it was far above that in the urban,which resulted in temperature daily range minished in suburbs.Therefore,the influence of urbanization on minimum temperature was significant but on maximum temperature it was weak.Overall,the intensity of the urban heat island in Ji' ning during 1981-2010 was increasing with the average value of 0.5 ℃.The heat island kept increase from 1981 to 1990,then maintained at a high level during 1991-2000,and after that decreased sharply to the average level.The urban heat island of Jibing had obvious monthly and diurnal variations.The heat island in winter half year was significantly higher than that in summer one.The intensity of heat island in winter was strongest but weakest in summer.In addition,the annual changes show that the heat island rose slowly for all seasons except fall,especially after 2000,the decline of heat island in fall contributed a lot to slow down the annual heat island.The heat island at daytime was significandy lower than that at night and was weakest around noon.The urban heat island was also found great relevance to the population and built-up area in Ji' ning,with the correlation coefficient of 0.81 and 0.75,respectively.
NETL
NSTL
万方数据
维普
