The study "Cosmic rays, cloud condensation nuclei and clouds – a reassessment using MODIS data" was recently published in the journal Atmospheric Chemistry and Physics. A group of researchers from the University of Oslo, Norwegian Institute for Air Research (NILU), CICERO Center for Climate and Environmental Research, and the University of Iceland, are behind the study.
There are scientific uncertanties about cosmic rays, cloud formation and warming and some researchers have claimed that a reduction of cosmic rays during the last decades has contributed to the global temperature rise. The hypothesis is that fewer cosmic rays causes fewer cloud droplets and reduced droplet size, and that this again causes global warming, since reduced cloud droplets would reflect less energy from the sun back to space.
“According to our research, it does not look like reduced cosmic rays leads to reduced cloud formation”, says Jon Egill Kristjansson, a professor at the University of Oslo. This result is in line with most other research in the field. As far as Kristjansson knows, no studies have proved a correlation between reduced cosmic rays and reduced cloud formation.
Kristjansson also points out that most research shows no reduction in cosmic rays during the last decades, and that an astronomic explanation of today’s global warming therefore seems very unlikely.
Kristjansson and his collegaues have used observations from so-called Forbush decrease events: Sudden outbreaks of intense solar activity that lead to a strong reduction of cosmic rays, lasting for a couple of days. The researchers have identified 22 such events between 2000 and 2005.
Based on data from the space-borne MODIS instrument, the researchers have investigated whether these events have affected cloud formation. While previous studies have mainly considered cloud cover, the high spatial and spectral resolution of the MODIS data also allows for a more thorough study of microphysical parameters such as cloud droplet size, cloud water content and cloud optical depth.
No statistically significant correlations were found between any of the four cloud parameters and galactic cosmic rays.
“Reduced cosmic rays did not lead to reduced cloud formation, either during the outbreaks or during the days that followed. Indeed, following some of the events we could see a reduction, but following others there was an increase in cloud formation. We did not find any patterns in the way the clouds changed”, Kristjansson explains.
By focusing on pristine Southern Hemisphere ocean regions, the researchers examined areas where a cosmic ray signal should be easier to detect than elsewhere.
Article: J. E. Kristjánsson, C. W. Stjern, F. Stordal, A. M. Fjæraa, G. Myhre, and K. Jónasson, Cosmic rays, cloud condensation nuclei and clouds – a reassessment using MODIS data, Atmos. Chem. Phys., 8, 7373-7387, 2008 www.atmos-chem-phys.net/8/7373/2008/