Nights getting warmer in Hyderabad, thanks to urban heat island effect

Nights become unbearable in the summer, especially during power cuts and one reason behind it is the Urban Heat Island (UHI) effect, which becomes pronounced at nights.

Published: 16th April 2018 04:03 AM  |   Last Updated: 16th April 2018 04:03 AM   |  A+A-

Express News Service

HYDERABAD: Nights become unbearable in the summer, especially during powercuts and one reason behind it is the Urban Heat Island (UHI) effect, which becomes pronounced at nights. This results in the city becoming warmer than its surrounding areas making the city a ‘heat island’.  N Sridhar, pursuing his postdoctoral research at Geography and Geoinformatics department in OU said, “The heat absorbed across the day by land and man-made structures in city like buildings, is emitted during the night.

With urban areas getting more concretised, the heat absorbed in the course of a day is higher than the peri-urban areas. As a result, the heat emitted at night by a city is also higher than the surrounding areas. Even in a city, the heat absorbed in a day and emitted at night varies from one place to another depending on the land use pattern in different areas. The variation can be in the range of 5-6 degree Celsius.” Keeping the rapid concretisation of the city, it should not come as a surprise that as part of a study conducted by Sridhar, , the variations in temperature from core areas of Greater Hyderabad to its suburbs was 7-8 degree Celsius.

The study titled, ‘Seasonal Analysis of Urban Heat Island of Greater Hyderabad Using Thermal Remote Sensing’ published recently in Journal of Remote Sensing & GIS, reports that while the average Land Surface Temperature at night in densely built up areas of the city was 29.11 degree Celsius, it was recorded at 21.69 degree Celsius in a rural area outside the city, which is a difference of 7.420C.

The study notes, “The boundary of urban heat island night time to a greater extent coincides with city limits.” It also notes, “The urban heat island formation is more conspicuous during night time because rural areas cool off faster at night time than cities.”  and therefore maximum urban heat island effect.”

What is UHI?

UHI is based on the concept that as urban areas develop, open spaces like agricultural lands, forests or lakes in a city are replaced by man-made structures.

Stay up to date on all the latest Hyderabad news with The New Indian Express App. Download now
(Get the news that matters from New Indian Express on WhatsApp. Click this link and hit 'Click to Subscribe'. Follow the instructions after that.)

Comments

Disclaimer : We respect your thoughts and views! But we need to be judicious while moderating your comments. All the comments will be moderated by the newindianexpress.com editorial. Abstain from posting comments that are obscene, defamatory or inflammatory, and do not indulge in personal attacks. Try to avoid outside hyperlinks inside the comment. Help us delete comments that do not follow these guidelines.

The views expressed in comments published on newindianexpress.com are those of the comment writers alone. They do not represent the views or opinions of newindianexpress.com or its staff, nor do they represent the views or opinions of The New Indian Express Group, or any entity of, or affiliated with, The New Indian Express Group. newindianexpress.com reserves the right to take any or all comments down at any time.

flipboard facebook twitter whatsapp