热岛效应有什么危害（What harm does the heat island effect have）.doc

热岛效应有什么危害（What harm does the heat island effect have） DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Excuse me, what harm does the heat island effect? What is the harm of heat island effect sunny windless summer, the ground temperature is higher than the surrounding islands, sea temperature, and thus the formation of cumulus convection and sea breeze circulation over the island, this is the performance of marine heat island effect. In recent years, as the city population concentration, industrial development, traffic congestion, air pollution, and the city of stone and concrete buildings are built, its thermal conductivity and heat capacity are very high, and the building itself to the wind barrier or weaken, the city average annual temperature than in the suburbs can be high 2 degrees or more, the temperature distribution on the space of city, like a warm Island, resulting in the formation of urban heat island effect. The heat island effect is a comprehensive phenomenon of climate change caused by peoples change of urban surface. It is most obvious in winter and obvious at night than in daytime. It is one of the most obvious characteristics of urban climate. Climate conditions are the external factors that cause urban heat island effect, and urbanization is the internal cause of heat island. It is generally believed that there are three causes of heat island: first, the surface properties of the jujube suburbs are different, and the thermal properties are different. Urban low reflectance and absorption of heat, evaporation heat consumption, fast heat conduction, and radiation heat loss slow, just opposite the suburbs; the two is the anthropogenic heat emissions than the suburbs of big city; three is the drag of air pollution concentration, aerosol particles, the role of the insulation in a certain extent. Air pollution plays a rather complicated and specific rol