The Urban Heat island (UHI) effect is the phenomenon of an urban area having a significantly higher temperature compared to the rural areas surrounding it. The main cause of this temperature change is the urban development which causes the surfaces of the land to be different. Most of the materials used effectively retain heat as the number one contributor while heat energy produced as waste is the secondary contributor. The heat can also be altered by the increased populations in the urban area.
It refers to the situation in which cities and the air above them is particularly hot. This occurs because cities are covered in dark-colored hard-scape and they also have very little greenery. This is why the idea of green roofs for cities is a particularly good one. An urban heat island (UHI) is a metropolitan area which is significantly warmer than its surrounding rural areas. The phenomenon was first investigated and described, though not by name, by Luke Howard FRS in the 1810s. The temperature difference usually is larger at night than during the day, and is most apparent when winds are weak. Seasonally, UHI is seen during both summer and winter. The main cause of the urban heat island is modification of the land surface by urban development which uses materials which effectively retain heat; waste heat generated by energy usage is a secondary contributor. As population centers grow they tend to modify a greater and greater area of land and have a corresponding increase in average temperature.
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