Buildup of heat in the atmosphere above an urban area. The large concentration of cars, buildings, factories, and other heat-producing activities produces this heat.
The increased temperatures in urban areas compared with surrounding rural areas. This is due to the significant amount of brick, concrete, asphalt, etc, in a city which absorbs significant amounts of heat during the day and releases it gradually at night, keeping the urban areas warmer than the surrounding rural areas.
Refers to the tendency for urban areas to have warmer air temperatures than the surrounding rural landscape, due to the low albedo of streets, sidewalks, parking lots, and buildings. These surfaces absorb solar radiation during the day and release it at night, resulting in higher night temperatures.
a term describing a highly developed urban area that is warmer than the surrounding countryside
a term given to larger cities, because heat coming from pavement and buildings causes the temperature in the city to be several degrees warmer than the surrounding territory
dark surfaces such as pavement and rooftops reflect less light than fields and forests, so cities absorb more heat from sunlight. This makes them warm more during the day and cool less at night, compared with surrounding areas.
A built environment wherein the large proportion of dark absorbing surfaces (such as asphalt paving and dark roofs) trap sunshine and radiate it back into the atmosphere, causing higher ambient temperatures and higher pollution levels.
An urban area that, due to denuded landscape, impermeable surfaces, surfaces with low albedo, massive buildings, heat generating cars and machines, and pollutants, is measurably hotter than surrounding rural areas.
The phenomenon of higher temperatures in a city compared to the surrounding countryside, caused by the combination of paved surfaces, lack of shade, and heat retention of the buildings and structures.
is a build up of heat which is created in an urban environment resulting from buildings and energy consumption
(Or heat island.) Closed isotherms indicating an area of the surface that is relatively warm; most commonly associated areas of human disturbance such as towns and cities. The physiographic analogy derives from the similarity between the pattern of isotherms and height contours of an island on a topographic map. Heat islands commonly also possess "cliffs" at the urban–rural fringe and a "peak" in the most built-up core of the city. The annual mean temperature of a large city (say 106 inhabitants) may be 1°–2°C warmer than before development, and on individual calm, clear nights may be up to 12°C warmer. The warmth extends vertically to form an urban heat dome in near calm, and an urban heat plume in more windy conditions.
The increased air temperatures in urban areas as contrasted to the cooler surrounding rural areas.
Observed condition that urban areas tend to be warmer than surrounding rural areas.
An urban heat island (UHI) is a metropolitan area which is significantly warmer than its surroundings. As population centres grow in size from village to town to city, they tend to have a corresponding increase in average temperature, which is more often welcome in winter months than in summertime. The EPA says: "On hot summer days, urban air can be 2-10°F [2-6°C] hotter than the surrounding countryside.
