Essay On Heat Island

What is a heat island?
Solar radiation energy heats the roads and buildings in cities. This allows the air temperature to rise more rapidly in the cities. During night, the heat energy in roads and other structures is slowly released into the air, which slows the cooling process. This phenomenon is known as the urban heat island effect and it keeps cities warmer than rural areas during the day as well as night. infrared radiation is also blocked by tall buildings which keeps the heat energy from escaping and slows down the cooling process. incoming solar energy is also used to evaporate water from vegetation and soil in rural areas. This energy, known as evaporation, is used to change water from the liquid state to the vapour state. This process does not raise the air temperature.

during the day Buildings and other structures can store more heat than plants, at night, they emit some of that heat, contributing to warmer temperatures. Cities might also have less reflectiveness, which would let them soak up more of the Sun’s heat. One of the effects of an increasing temperature trend in cities is the increasing level of ozone in the air. Ozone is a major pollutant formed when emissions from motor vehicles and UV radiation from sunshine react in air .Its formation is faster and greater when the air temperature increases. Most researchers have considered the biggest contributor to the urban heat island effect is that there isn’t as much evaporation as vegetation has been replaced by concrete. Evaporation absorbs energy and keeps the rural areas cooler. Lei Zhao, of Nanjing University of Information Science and Technology in China, and colleagues began with a question: Would similar cities located in different climates experience the same increase in temperature from the urban heat island effect? From some research they could see some trends: bigger cities tended to experience a greater difference in temperature at midnight, compared with the