CERN-clouds

CERN’s CLOUD experiment results suggests industrial revolution reduced cloud cover, cosmic rays have an impact too

From CERN Our planet’s pre-industrial climate may have been cloudier than presently thought, shows CERN’s CLOUD experiment in two papers published in Nature. CERN experiment points to a cloudier pre-industrial climate In two papers1,2 published today in the journal Nature, new results from the CLOUD3experiment at CERN4 imply the baseline pristine pre-industrial climate may have…

low cloud cover and cosmic rays

Cosmic Disconnections

I read yesterday that someone had supposedly provided evidence in support of Svensmark’s hypothesis that cosmic rays affect the weather. So I went to look it up. The study is called Cloud cover anomalies at middle latitudes: links to troposphere dynamics and solar variability, by S. Veretenenkoa and M. Ogurtsova, paywalled here. Let’s look at this…

cosmic_rays_hit_earth[1]

Link between Cosmic Ray Flux and Global Temperature found

From the paper in PNAS:(h/t to Dr. Leif Svalgaard) Our results suggest weak to moderate coupling between CR and year-to-year changes of GT,” they write. “However, we find that the realized effect is modest at best, and only recoverable when the secular trend in GT is removed.” This “secular trend” is the warming widely believed…