And it begins - Global Warming Cooling

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I have always held that the sun is the chief contributor to our overall climate and that we are coming out of a time of increased solar activity and entering a long phase of minimal solar output. Events like this are the basis for the various climactic minima we have had throughout history - little ice ages. People holding ice fairs on the frozen river Thames in London. Now, we have this report from the University of California - San Diego:

Reduced Energy from the Sun Might Occur by Mid-Century. Now Scientists Know by How Much
The Sun might emit less radiation by mid-century, giving planet Earth a chance to warm a bit more slowly but not halt the trend of human-induced climate change.

The cooldown would be the result of what scientists call a grand minimum, a periodic event during which the Sun’s magnetism diminishes, sunspots form infrequently, and less ultraviolet radiation makes it to the surface of the planet. Scientists believe that the event is triggered at irregular intervals by random fluctuations related to the Sun’s magnetic field.

Scientists have used reconstructions based on geological and historical data to attribute a cold period in Europe in the mid-17th Century to such an event, named the “Maunder Minimum.” Temperatures were low enough to freeze the Thames River on a regular basis and freeze the Baltic Sea to such an extent that a Swedish army was able to invade Denmark in 1658 on foot by marching across the sea ice.

A team of scientists led by research physicist Dan Lubin at Scripps Institution of Oceanography at the University of California San Diego has created for the first time an estimate of how much dimmer the Sun should be when the next minimum takes place.

There is a well-known 11-year cycle in which the Sun’s ultraviolet radiation peaks and declines as a result of sunspot activity. During a grand minimum, Lubin estimates that ultraviolet radiation diminishes an additional seven percent beyond the lowest point of that cycle. His team’s study, “Ultraviolet Flux Decrease Under a Grand Minimum from IUE Short-wavelength Observation of Solar Analogs,” appears in the publication Astrophysical Journal Letters and was funded by the state of California.

Our sun has been very very quiet for the last couple of years. More people die from cold than from heat.

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About this Entry

This page contains a single entry by DaveH published on February 9, 2018 6:46 PM.

Now this is cool - filtering water was the previous entry in this blog.

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