Urban heat island -UPSC

Urban heat island : IIT Delhi’s Centre for Atmospheric Sciences recently examined changes in land use and land cover patterns over the last five decades using maps from Delhi from 1972 to 2014. The goal was to see how the urban heat island effect in the Central National Capital Region had changed as a result of urbanization.

The most important findings

• The urban heat island effect causes some areas to be hotter than others due to factors such as concretization, population density, and land-use density.

• Between 1970 and 2010, Delhi’s near-surface temperature increased by 1.02oC due to increased urban-land use.

• The Centre for Atmospheric Sciences at IIT Delhi recently examined changes in land use and land cover patterns over the last five decades using maps from Delhi from 1972 to 2014. The goal was to see how the urban heat island effect in the Central National Capital Region had changed as a result of urbanization.

The heat wave has been a silent disaster.

• A heat wave is defined as a period of unusually hot weather.

• For heatwaves, the IMD has set the following criteria:

• A station’s maximum temperature reaches 40 °C in the plains, 37 °C in coastal stations, and 30 °C in hilly areas.

• If a station’s normal maximum temperature is less than or equal to 40 °C, a heat wave is defined as a temperature difference of 5 to 6 °C, and a severe heat wave is defined as a temperature difference of 7 °C or more.

• If the station’s normal maximum temperature is more than 40 °C, a heat wave is defined as a temperature difference of 4 to 5 °C, and a severe heat wave is defined as a temperature difference of 6 °C or more.

• Heat waves should be declared when the actual maximum temperature is 45°C or higher, regardless of the normal maximum temperature.

• Heatwaves have an impact that is not limited to cities, but cities exacerbate the phenomenon (Urban Heat Island).

The consequences of a heat wave

• Sunstroke (a body temperature of over 40 degrees Celsius) and vital organ failure: Heatwaves claimed the lives of over 2,300 people in 2015.

• Reduced human output due to negative effects on mental health (the body functions best within a narrow temperature range of 36-37.5 °C).

• Financial cost: Increased spending on cooling equipment.

• Negative effects on the environment, such as decreased biological activity and carbon sequestration.

• There are forest fires.

The most important findings

• The urban heat island effect causes some areas to be hotter than others due to factors such as concretization, population density, and land-use density.

• Between 1970 and 2010, Delhi’s near-surface temperature increased by 1.02 Celsius due to increased urban-land use.

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