城市是人口、商业、工业高度集中的区域,由于人类的活动和工业生产排放出大量的热量,使城市气温比周围郊区气温高,这一现象就称为“城市热岛效应”。我国曾观测到的最大城乡温差即城市热岛强度,1979年11月13日20时达6.8℃,北京1966年2月22日清晨达9℃。随着城市的发展和人口的稠密化,“城市热岛效应”变得日益突出。上海 The city is a region where population, commerce and industry are highly concentrated. The phenomenon of urban heat island effect is called “urban heat island effect” due to the large amount of heat emitted by human activities and industrial production, which makes the urban air temperature higher than the surrounding suburbs. The maximum temperature difference between urban and rural areas in our country, namely the urban heat island intensity, reached 6.8 ° C at 20:00 on November 13, 1979 and reached 9 ° C on the morning of February 22, 1966 in Beijing. With the development of cities and population density, the “urban heat island effect” has become increasingly prominent. Shanghai