Gcr and Enso Trends In Isccp-d2 Low Cloud Properties.
Abstract
The recently reported correlation between clouds and galactic cosmic rays (GCR) implies the existence of a previously unknown process linking solar variability and climate. An analysis of the interannual variability of ISCCP-D2 low cloud proper- ties suggests that low clouds are statistically related to two processes, a) GCR and b) ENSO, with GCR explaining a greater percentage of the total variance. Areas where satellites have an unobstructed view of low cloud possess a strong correlation with GCR, which suggests that low cloud properties observed in these regions are less likely to be contaminated from overlaying cloud. The GCR - low cloud correlation cannot easily be explained by internal climate processes, changes in direct solar forc- ing, or UV-ozone interactions. Instead, it is argued that a mechanism involving solar variability via GCR ionisation of the atmosphere is consistent with these results.
- Publication:
-
EGS General Assembly Conference Abstracts
- Pub Date:
- 2002
- Bibcode:
- 2002EGSGA..27.6013M