Abstract
The problem of the contribution of cosmic rays to climate change is a continuing one and one of importance. In principle, at least, the recent results from the CLOUD project at CERN provide information about the role of ionizing particles in ’sensitizing’ atmospheric aerosols which might, later, give rise to cloud droplets. Our analysis shows that, although important in cloud physics the results do not lead to the conclusion that cosmic rays affect atmospheric clouds significantly, at least if H2SO4 is the dominant source of aerosols in the atmosphere. An analysis of the very recent studies of stratospheric aerosol changes following a giant solar energetic particles event shows a similar negligible effect. Recent measurements of the cosmic ray intensity show that a former decrease with time has been reversed. Thus, even if cosmic rays enhanced cloud production, there would be a small global cooling, not warming.
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Acknowledgments
We acknowledge the NMDB database http://www.nmdb.eu, founded under the European Union FP7 programme (contract no. 213007) for providing data and also the staff of IGY JUNG monitor. The authors are grateful to Professors Giles Harrison, Jasper Kirkby, Irina Mironova, Ilya Usoskin and Dr. Rolf Buetikofer for helpful correspondence. We are grateful to the John C. Taylor Charitable Foundation for financial support.
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Erlykin, A.D., Sloan, T. & Wolfendale, A.W. A review of the relevance of the ‘CLOUD’ results and other recent observations to the possible effect of cosmic rays on the terrestrial climate. Meteorol Atmos Phys 121, 137–142 (2013). https://doi.org/10.1007/s00703-013-0260-x
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DOI: https://doi.org/10.1007/s00703-013-0260-x