Characteristics of Urban Heat Island Effect in Tongchuan
The heat island intensity of Tongchuan in the past 10 years was calculated and the variation characteristics of the urban heat island effect were analyzed statistically,using the daily and hourly temperature observation data of the automatic stations in suburban Tongchuan from 2011 to 2020.The results showed that the average annual temperature of the urban station in Yaozhou District was higher than that of four stations in the surrounding suburbs,with an average of 0.9 ℃ in the past 10 years,showing a significant increasing trend.The average annual temperature of the urban station in Yaozhou District increased by 0.1 ℃ and that of the surrounding suburban stations increased by 0.04 ℃.The temperature difference between two kinds of stations was small before 2013,but increased rapidly after 2013.The Tongchuan heat island effect was weak during the day and strong at night.There was also a cold island effect from 12 to 16 o'clock in January and from 11 to 14 o'clock in July.The heat island intensity was strongest in summer and weakest in winter.In the first five years(2011-2015),the heat island effect was strongest in summer and autumn,followed by spring and weakest in winter.In the last five years(2016-2020),the intensity of heat island effect was strongest in summer,the second in autumn,and weakest in winter and spring.The intensity of heat island effect was 0.3-0.1 ° C in every month,which increased gradually from April to August,reaching the strongest 1.1 ℃ in August,and decreased gradually from August to April the next year,reaching the weakest 0.2 ℃ in April.The annual mean intensity of heat island effect was positively correlated with annual mean temperature and negatively correlated with annual mean sunshine duration and relative humidity.
Heat island effectVariation characteristicsMeteorological factorsTongchuan
万方数据
维普
