Sunspots - Prediction of New "Dalton Minimum"

Global COOLING Anyone?

Nearly TWO YEARS ago (January 2009 and December 2009 [nearly FIVE years ago now]) I predicted that the now current Sunspot Cycle #24 would peak at 80. I am now revising that down to a peak of only 60, based on a great posting by David Archibald at Watts Up With That, the most widely read and respected climate website in the world.

We may be in for a new Dalton Minimum similar to the period from 1790 to 1830 when temperatures were unusually low. Indeed, we may come to welcome the cushion of warmth, perhaps 0.1 to 0.2ºC, that may be due to recent human activities. (The IPCC Climate "Team" claims 0.6 to 0.8ºC rise mostly due to human-caused Global Warming, but that is most likely an over-estimate.)

As the graphic shows, at the time I made the 80 prediction, NASA was predicting a peak of 104, having revised it downwards a couple of times from their original, wildly high estimate of a 156 peak. The most recent NASA projection is 90.

Description of the Graphic

[Click graphic for larger version] The base for the graphic is from Archibald's posting (Figure 9). The BROWN curve plots actual data from Solar Cycles #3, #4, #5, and #6 (late 1700's through early 1800's). The GREEN curve plots the corresponding actual data for Solar Cycles #22, #23, and the first part of #24, (1990 through December 2010)

I have added the annotations in RED and GRAY, indicating NASA's incredible string of highly incorrect predictions from 2006 to most recent (red hoops) and my original January 2009 prediction and my revised prediction (gray hoops).

Historical Correlation of the Dalton and Maunder Minima with Sunspot Activity

The very cold temperatures from 1790 through 1830 are usually explained as being due to increased volcanic activity, including the Mount Tambora eruption of 1815 that caused the Year Without a Summer, 1816. However, low solar activity, with peak Sunspot counts of only 45 for Sunspot Cycles #5 and #6, is most likely the major cause. Even lower Sunspot counts (below 10) occurred during the earlier Maunder Minimum (1650 to 1700). These periods of Global Cooling were marked by crop failures that are inimicable to human life.

Explanation of the Effect of Sunspot Counts on Climate

The NY Times interviewed Henrik Svensmark last year about his theory of Sunspots and Climate:

One possibility proposed a decade ago by Henrik Svensmark and other scientists at the Danish National Space Center in Copenhagen looks to high-energy interstellar particles known as cosmic rays. When cosmic rays slam into the atmosphere, they break apart air molecules into ions and electrons, which causes water and sulfuric acid in the air to stick together in tiny droplets. These droplets are seeds that can grow into clouds, and clouds reflect sunlight, potentially lowering temperatures.

The Sun, the Danish scientists say, influences how many cosmic rays impinge on the atmosphere and thus the number of clouds. When the Sun is frenetic, the solar wind of charged particles it spews out increases. That expands the cocoon of magnetic fields around the solar system, deflecting some of the cosmic rays.

But, according to the hypothesis, when the sunspots and solar winds die down, the magnetic cocoon contracts, more cosmic rays reach Earth, more clouds form, less sunlight reaches the ground, and temperatures cool.

“I think it’s an important effect,” Dr. Svensmark said, although he agrees that carbon dioxide is a greenhouse gas that has certainly contributed to recent warming.

Dr. Svensmark and his colleagues found a correlation between the rate of incoming cosmic rays and the coverage of low-level clouds between 1984 and 2002. They have also found that cosmic ray levels, reflected in concentrations of various isotopes, correlate well with climate extending back thousands of years.

Conclusion

Before we destroy industrial economies with extreme measures to reduce carbon emissions, it will be a good idea to consider how that might not only not be effective in reducing human-caused Global Warming, but how a bit of carbon-warming could be welcome during the coming period of Global Cooling. By the way, I am still in favor of an across-the-board Carbon Tax because the steady rise in CO2 levels is unprecedented and that is the most intelligent way to utilize our market-based economic system to speed the development of renewable energy sources. However, that effort has a multi-decade time horizon and is no emergency.

Ira Glickstein