Lund University have published a reconstruction of solar activity vs snow accumulation in Greenland, which indicates a strong correlation between solar minima and a colder climate.
‘The study shows an unexpected link between solar activity and climate change,’ Dr Muscheler said in a press release.
‘It shows both that changes in solar activity are nothing new and that solar activity influences the climate, especially on a regional level. ‘Understanding these processes helps us to better forecast the climate in certain regions.’
According to the study abstract;
“We find that during the Last Glacial Maximum, solar minima correlate with more negative δ18O values of ice and are accompanied by increased snow accumulation and sea-salt input over central Greenland. We suggest that solar minima could have induced changes in the stratosphere that favour the development of high-pressure blocking systems located to the south of Greenland, as has been found in observations and model simulations for recent climate9, 10. We conclude that the mechanism behind solar forcing of regional climate change may have been similar under both modern and Last Glacial Maximum climate conditions.”
Dr. Muscheler emphasised that he does not believe that the sun is the main factor driving current global warming – but he does believe that climate modellers will have to pay more attention to the influence of the sun on climate change.
However, he warned that the sun was not the only factor in causing climate change.
‘Climate skeptics like to say sun is causing more global warming than we think but I don’t think so.
‘What our paper shows is we need to include all processes – greenhouses, the sun and so on, especially for local climates which is important of course.