It is known as The Heat Island Effect or Urban Heat Island. The main cause is the materials that are used to modify the land surfaces (asphalt roads, concrete sidewalks) and buildings contain materials store short wave radiation effectively. A secondary contributor is waste heat generated by energy usage.
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Vaporized water rises because it is 100 degrees Celsius or warmer and is therefore warmer than the surrounding air and warmer air always rises above colder air.
Cities are warmer than the areas immediately around them.
The weather usually starts to get warmer during March and April, sometimes it starts to get warmer in late February though.
Roofs and streets store up heat. Cars and central heating give out heat, So the city tends to be warmer than the countryside
Cities are usually warmer than the surrounding open countryside, due to heat loss from buildings, vehicles, etc.
Concrete jungles, or Urban Heat Islands, as they are known, hold the heat better. Cities, especially cities with few parks and green belts, are usually warmer than the countryside. This, however, does not affect global warming. Globally temperatures are averaged, and the cooler countryside balances out the warmer cities. Scientists measuring the temperature are always careful to make sure urban heat islands do not influence the temperature trends, which are increasing at the same rate in cities and countryside.
There are several climate differences in large cities when compared to their surrounding areas. The center of large cities is up to 10 to 20 degrees Fahrenheit warmer than the surrounding areas. A blanket of pollutants and moisture hangs over large cities which contributes to the increased temperature. Tall buildings also alter wind speeds and direction, along with amount of precipitation.
There are several climate differences in large cities when compared to their surrounding areas. The center of large cities is up to 10 to 20 degrees Fahrenheit warmer than the surrounding areas. A blanket of pollutants and moisture hangs over large cities which contributes to the increased temperature. Tall buildings also alter wind speeds and direction, along with amount of precipitation.
If moisture content is the same, it would be warmer.
The urban heat island effect is a warming effect. Unban means 'city'. Buildings and roads retain more heat and warm the air around them, so cities are warmer then the countryside.
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