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Government conspiracy heat wave or no government conspiracy heat wave, this summer is setting records -- not just record maximum temperatures, but also record minimums. On June 27, Oman recorded the world’s highest ever minimum temperature when the mercury failed to drop below 107.1 degrees F, even overnight. And that’s more important, in a global sense, than the record highs.
A few things too-often glossed over in discussions of what climate change is doing to temperatures the world over:
1. In many cases, nighttime minimum temperatures are rising faster than daytime maximums, narrowing the gap between average daytime and nighttime temperatures even as both rise. And here's an excellent map-based representation of what this is doing to the U.S.
2. It's nighttime temperatures, not daytime highs, that kill people.
3. Up to a point, higher daytime temperatures actually increase yields of rice, which is the staple food for billions of people. But higher nighttime temperatures decrease those yields. Like people, growing rice needs to cool off overnight.
Increasing nighttime temperatures are therefore a double threat, to both public health and food security, and they are rising faster than daytime highs.
Last month I reported on a new paper by NASA’s James Hansen and Makiko Sato (see Hansen: “One sure bet is that this decade will be the warmest” on record). Kate at ClimateSight sighted a new color in the chart, “pink, which is even warmer than dark red.”
For those wondering why the x-axis jumps to 11.1°C, I emailed Hansen that very question, and he explains, “the numbers on the far right and far left of the color scale give the most extreme value that occurs in that particular (set of) map(s).”
It’s no surprise that new colors and extended ranges are need, given the accelerated Arctic warming we’ve been seeing.
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Science Chic wrote: thinkprogress.org/romm/2011/04/11/207859...ing-temperature-map/
Extreme warming forces climate scientists to add hot pink to temperature map
By Joe Romm on Apr 11, 2011
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