According to the authors, "The effect of solar cycle perturbation on [cloud condensation nuclei] based on present study is generally higher than those reported in several previous studies, up to around one order of magnitude [10 times]...Our global simulations indicate that a decrease in ionization rate associated with galactic cosmic ray flux change from solar minimum to solar maximum reduces annual mean nucleation rates, number concentration of cloud condensation nuclei larger than 10 nm... by 6.8%, 1.36%...respectively. The inclusion of 0.2 °C temperature increase enhances the CCN [cloud condensation nuclei] solar cycle signals by around 50%."
"The most obvious way for warming to be caused naturally is for small, natural fluctuations in the circulation patterns of the atmosphere and ocean to result in a 1% or 2% decrease in global cloud cover. Clouds are the Earth’s sunshade, and if cloud cover changes for any reason, you have global warming — or global cooling."
This new paper finds annual mean cloud nucleation rates may vary 6.8% over solar cycles, far more than the 1-2% change in global cloudiness required to change global temperature.
The solar-cosmic ray theory of climate is only one of many solar amplification mechanisms described in the scientific literature.
OPEN ACCESS FOCUS ON HIGH ENERGY PARTICLES AND ATMOSPHERIC PROCESSES
Fangqun Yu and Gan LuoShow affiliations