There is little doubt that most of us mention about the huge heat factor in India especially during summers. But taking a look at temperatures, one would see near similar temperatures across years. One big factor is our heat toleration has declined considerably thanks to air conditioners everywhere. The second bit could be this construction madness with concrete being used everywhere:
The monsoon has currently dissipated intense heat across India’s growing cities, but temperatures are rising and will continue to climb because of the way urban areas are expanding.
With trees, lakes and open spaces replaced by roads, expanses of concrete with closely spaced multi-storeyed buildings – often in violation of zoning and setback laws – Indian cities are turning into “heat islands”, according to an IndiaSpend review of scientific studies in five cities.
A clear trend is evident: The difference between the daytime maximum and nighttime minimum daily temperatures – the diurnal temperature range (DTR) – is steadily declining. This indicates that concretising cores of cities are retaining heat, even as temperatures rise in formerly cooler outskirts, as they, too, urbanise. A higher range of temperature indicates greater cooling.
* In Delhi, over a decade to 2011, the temperature range declined by more than 2 deg C, one of India’s strongest heat-island effects.
* In Chennai, the morning temperature at the city centre is between 3 to 4.5 deg C higher than its greener fringes.
* In Thiruvananthapuram, when a cool, evening breeze blows, the greener rural areas cool by 3.4 deg C, the city areas by half as much.
* In Guwahati, city areas are warmer by 2.13 deg C than the peripheries during the day and by 2.29 deg C at night.
* In Kochi, a canyon-like effect of buildings funnels heat into the city, creating a “heat island” that makes the centre 4.6 deg C warmer in winter and 3.7 deg C in winter.
Heat islands are created by a combination of design, construction material and environment. Closely built buildings form canyons that trap heat reflecting from their walls. Air-conditioning vents, especially in narrow alleys, further warm up buildings and nearby areas.
I guess as long as we are growing, these are blips we should just ignore. Any such talk will brand you as anti growth and development.
Another thing is using glasses in our buildings. Given the high heat, all these glasshouses just become greenhouses perfect for cooking people inside. This means even more usage of airconditioners and more rise of intolerance for heat.