Cosmic ray decreases and changes in the liquid water cloud fraction over the oceans

Details Cosmic ray decreases and changes in the liquid water cloud fraction over the oceans Cosmic ray decreases and changes in the liquid water cloud fraction over the oceans

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3623803l&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 23, CiteID L23803

Physics

11

Interplanetary Physics: Cosmic Rays, Atmospheric Processes: Clouds And Aerosols, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Processes: Remote Sensing

Scientific paper

Svensmark et al. (2009) have recently claimed that strong galactic cosmic ray (GCR) decreases during ‘Forbush Decrease (FD) events’ are followed by decreases in both the global liquid water cloud fraction (LCF) and other closely correlated atmospheric parameters. To test the validity of these findings we have concentrated on just one property, the MODIS LCF and examined two aspects: 1) The statistical chance that the decrease observed in the LCF is abnormal. 2) The likelihood of the observed delay (˜5 to 9 days) being physically connected to the FD events. On both counts we conclude that LCF variations are unrelated to FD events: Both the pattern and timing of observed LCF changes are irreconcilable with current theoretical pathways. Additionally, a zonal analysis of LCF variations also offers no support to the claimed relationship, as the observed anomaly is not found to vary latitudinally in conjunction with cosmic ray intensity.

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