Climate Letter #930

Weather Map findings.  Today let’s look at the global map under the Temperature heading.  The wide band of red that circles the global is always there, shifting up and down according to the season.  Within it there are always some dark smudges over land areas, signifying average daily temperatures that are in the 90s (F), with highs that are typically.   10-15 degrees above that.  The smudges now run all the way across North Africa and Arabia to India, covering a broader area and getting a little darker each day.  All those populations are under stress, and summer has just begun.

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As the global temperature warms, major swings in fundamental climate patterns are expected.  A new study has some interesting ideas about the changes that could evolve.  For example the “thermal equator” between the two hemispheres has a tendency to move northward, and with it the rain belt.  Concepts such as these are applicable when you read about large regions that are becoming uninhabitable as they lose sufficient rainfall.
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Two top scientists explain why it is so urgent to get real action started immediately on emissions reduction.  The remaining carbon budget keeps getting smaller and more difficult to abide by, and the dangerous tipping points we are headed toward keep getting closer.
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The leaders of France and India talk like they are ready to double down and strengthen the Paris accord.  Getting the full cooperation of India is one of the largest remaining sources of doubt about what the future holds, because of that nation’s enormous population and high growth ambitions, making this a good sign.  The post includes a temperature gauge graphic that has outstanding clarity of benchmark comparisons.  (We are now at 1.1C.)
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A disturbing new discovery about methane release in the Arctic.  The sea floor of the Arctic Ocean is found to have hundreds of craters formed by the blowout of pressurized methane in the distant past.  The present changes of conditions is thought to favor an uptick for this potentially massive phenomenon.
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A clear description of the potential for nitrous oxide release from thawing permafrost.  “Our results,” they report, “imply that the Arctic N2O budget will depend strongly on moisture changes, and that a gradual deepening of the active layer will create a strong non-carbon climate change feedback.”  N2O is an extremely powerful greenhouse gas and the third most common.
Carl

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