[1] Lawrence Livermore Natl Lab, Program Climate Model Diag & Intercomparison, Livermore, CA 94550 USA
[2] Natl Ctr Atmospher Res, Boulder, CO 80307 USA
[3] Univ Reading, Dept Meteorol, Reading RG6 6BB, Berks, England
[4] Met Off Hadley Ctr, Exeter EX1 3PB, Devon, England