Antinuclear

Australian news, and some related international items

Wet bulb (TW) temperature – a measure of heat+humidity – means that some parts of the world already too hot for humans

Climate change has already made parts of the world too hot for humans, New Scientist 8 May 2020, By Adam Vaughan   Global warming has already made parts of the world hotter than the human body can withstand, decades earlier than climate models expected this to happen.

Jacobabad in Pakistan and Ras al Khaimah in the United Arab Emirates have both repeatedly crossed a deadly threshold for one or two hours at a time, an analysis of weather station data found.

Wet bulb temperature (TW) is a measure of heat and humidity, taken from a thermometer covered in a water-soaked cloth. Beyond a threshold of 35°C TW the body is unable to cool itself by sweating, but lower levels can still be deadly, as was seen in the 2003 European heatwave that killed thousands without passing 28°C TW.

A US-UK team analysed weather station data across the world, and found that the frequency of wet bulb temperatures exceeding temperatures between 27°C TW and 35°C TW had all doubled since 1979. Though 35°C TW is thought of as a key threshold, harm and even death is possible at lower temperatures, so the team included these in their analysis.

Most of the frequency increases were in the Persian gulf, India, Pakistan and south-west North America. But at Jacobabad and Ras al Khaimah, 35°C TW appears to have been passed, the first time the breach has been reported in scientific literature.

“The crossings of all of these thresholds imply greater risk to human health  we can say we are universally creeping close to this magic threshold of 35°C. The tantalising conclusion is it looks like, in some cases for a brief period of the day, we have exceeded this value,” says Tom Matthews at Loughborough University in the UK……….: https://www.newscientist.com/article/2242855-climate-change-has-already-made-parts-of-the-world-too-hot-for-humans/#ixzz6M5ow6Dlr

May 11, 2020 - Posted by | General News

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