Climate Letter #1225

Posted on July 31, 2018 by Carl Campbell
Catastrophic volcanoes can change the climate (for awhile) and alter our lives.  This post is based on a scientific study of some of the bigger ones of the last millennium.  Don’t overlook the video near the end.

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Climate change is involved in the creation of toxic algae blooms.  This summer has witnessed an explosion of these blooms in freshwater lakes and streams in Western states, sometimes in unexpected places.  An extra amount of heat is generally one of the factors.
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A writer for The Guardian has unkind things to say about the vested interests that make big profits from pushing the world toward climate catastrophe and then showing little interest in ever holding back.  There are many businesses on the losing end, like the insurance industry, that are struggling to keep afloat.
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If you have an interest in Earth science and appreciate listening to a really fine speaker, I found this lecture on youtube that was presented at MIT early this year by a scientist who has a wide-ranging and endless supply of interesting things to talk about, quite fascinating.
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Climate science:  What brings a normal ice age interglacial period to an end?  Theories have long held that solar orbital changes described by the Milankovitch cycles were responsible for initiating both the beginning and end of a typical ice age.  Evidence has been found in sediments from a site in northern Finland that substantiates this idea, plainly described in the chart found at the link below, taken from a recent study.  The top panel shows how temperatures in December and June both closely followed separate trends of solar insolation during the 10,000 year Eemian interglacial, which were diverging sharply at that time.  Winters were growing warmer year by year, which helps produce more snow, and summers cooler, allowing less and less time for melting and thus a greater albedo effect which would amplify the cooling and ultimately cause an ice sheet to begin growing.  The two insolation curves are precisely determined by well-known physical patterns.  The chart also shows a big dip about 128,000 years ago that was a primary feature of the study, attributed to major changes in oceanic currents in the North Atlantic.
–The entire study is available at https://www.nature.com/articles/41467-018-05314-1
Carl

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