GSA Annual Meeting in Phoenix, Arizona, USA - 2019

Paper No. 210-11
Presentation Time: 4:30 PM


EASTERBROOK, Don J., Dept. of Geology, Western Washington Univ, High St, Bellingham, WA 98225

The Greenland and Antarctic ice cores have produced a wealth of data related to changing climates and the Pleistocene Ice Ages. These data permit analyses of key factors related to global temperature fluctuations: sunspot numbers, total solar irradiance, solar magnetic intensity, production rates of 14C and 10Be, cosmic ray incidence, and temperature.

The correlation of low sunspot numbers, low total solar irradiance, and increased production of 14C and 10Be with The Oort, Wolf, Sporer, Maunder, and Dalton Solar Minimums of the Little Ice Age has long been recognized, but no one has looked at the role of these key factors during many smaller warm/cool periods and the 10 major glaciations and interglaciations of the past 800,000 years. This study considered the role of the key factors during all warm/cold periods of any size during the past 800,000 years, including the Ice Ages.

The data shows that virtually every significant climatic cooling, from small changes in the Holocene to the Little Ice Age, to the 10 major global glaciations over the past 800,000 years, is accompanied by low sunspot numbers (indicating low solar magnetic intensity), low total irradiance, and high production rates of 14C and 10Be (indicating higher intensity of cosmic rays). All of this is well beyond the realm of coincidence and indicates cause-and-effect relationships. The solar magnetic concept stands by itself on its own evidence and does not depend on any other theory. The evidence strongly supports the Svensmark theory but does not depend on its veracity.