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WEATHER REPORT
Small climb in mean temperatures linked to far higher chance of deadly heat waves
by Staff Writers
Irvine CA (SPX) Jun 12, 2017


"In addition to India, populations in other developing countries in low- to mid-latitude regions are especially hard hit by these extreme heat events," says the study's lead author, Omid Mazdiyasni, here flanked by co-authors Amir AghaKouchak (left) and Steven J. Davis. Credit Steve Zylius / UCI

An increase in mean temperature of 0.5 degrees Celsius over half a century may not seem all that serious, but it's enough to have more than doubled the probability of a heat wave killing in excess of 100 people in India, according to researchers at the University of California, Irvine and other institutions.

This could have grim implications for the future, because mean temperatures are projected to rise by 2.2 to 5.5 degrees Celsius by the end of this century in the low- and mid-latitude countries of the Asian subcontinent, the Middle East, Africa and South America.

"The impact of global climate change is not a specter on the horizon. It's real, and it's being felt now all over the planet," said Amir AghaKouchak, UCI associate professor of civil and environmental engineering and co-author of the study, published in Science Advances. "It's particularly alarming that the adverse effects are pummeling the world's most vulnerable populations."

Using data gathered by the India Meteorological Department from 1960 to 2009, the UCI-led team analyzed changes in summer temperatures; the frequency, severity and duration of heat waves; and heat-related deaths.

They found that when mean summer temperatures in the South Asia nation went from 27 to 27.5 degrees Celsius, the probability of a heat wave killing more than 100 people grew from 13 percent to 32 percent - an increase of 146 percent.

In real terms, there were only 43 and 34 heat-related fatalities in 1975 and 1976, respectively, when the mean summer temperature was about 27.4 degrees Celsius. However, at least 1,600 people died from excessive heat in 1998, when the mean summer temperature was higher than 28 degrees Celsius.

The average number of heat wave days over the five-decade study period was 7.3 per year. The most heat wave days occurred in 1998 (18), when 1,655 people died, and 2003 (13), when 1,500 people died.

A global issue
India is currently home to over 1.3 billion people, nearly a quarter of whom live on less than $1.25 a day and have little to no access to electricity.

"In addition to India, populations in other developing countries in low- to mid-latitude regions are especially hard hit by these extreme heat events," said lead author Omid Mazdiyasni, a UCI graduate student in civil and environmental engineering. "They lack air conditioning that people in richer countries rely on when the heat is unbearable, and they don't have funds to escape to cooler climates."

The study authors stressed that their findings should serve as a wake-up call for governments and international organizations to help improve the resilience of areas most vulnerable to climate change-induced weather events. But in the wake of last week's news of the United States withdrawing from the Paris climate accord, they acknowledged the difficulty in building a broad-based coalition to tackle the issue.

"Given the quantifiable impacts of climate change in India and other developing nations in the coming decades, both rich and poor countries should be ramping up our efforts to combat global climate change instead of turning our backs on commitments we have made to the international community," said co-author Steven J. Davis, UCI associate professor of Earth system science.

WEATHER REPORT
'Panic' in Bangladesh factories as workers collapse in heatwave
Dhaka (AFP) May 25, 2017
Panic broke out in more than a dozen factories in Bangladesh's capital as hundreds of garment workers fell ill in a heatwave, forcing the plants to close, police said Thursday. Police said 18 factories, which export clothes to Western retailers, had been shut since Wednesday after chaotic scenes saw some 30,000 workers leave in the middle of their shifts. "490 workers became sick (Thursd ... read more

Related Links
University of California - Irvine
Weather News at TerraDaily.com

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