What are the causes of Urban Heat Island ?

QuestionsCategory: Global WarmingWhat are the causes of Urban Heat Island ?
Rhea Mehta asked 6 years ago
What are the causes of Urban Heat Island ?
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What are the causes of Urban Heat Island ?
Rise in temperatures is a constant threat all around the globe. There is growing urbanization in different parts of world. With this the phenomenon known as Urban Heat Island effect had begun to be observed.
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Team GreenSutra® Staff answered 6 years ago
Urban Heat Islands are densely populated urban or metropolitan areas having higher temperatures compared to their surrounding areas.Several factors that contribute towards the formations of Urban Heat Islands can be listed as follows:

  • Increased Air Pollution – Air pollutants like CO2 are known to store heat resulting in the rise of atmospheric temperature.
  • High Absorption of Solar Radiation – Use of low albedo materials (materials that have high absorptive rates for solar energy, mainly heat) in construction of roads, pavements, roof tops results to increase in local temperatures.
  • Highly Restricted Air Flow – Densely structured urban areas pose as obstacles for Wind reducing its speed. This in turn reduces the cooling effect by convection.
  • Low cooling efficiency due to less Vegetation – Different types of vegetation absorbs COfrom the surroundings for photosynthesis along with the solar heat increasing the cooling efficiency in the urban areas.
  • Increased consumption of fuel to counter rise in temperatures – Consuming additional fuel releases more pollutants into the atmosphere.