[1] CALTECH, JET PROP LAB, PASADENA, CA 91109 USA
[2] UNIV READING, DEPT METEOROL, CGAM, READING RG6 2AU, BERKS, ENGLAND
[3] HERIOT WATT UNIV, DEPT PHYS, EDINBURGH EH14 4AS, MIDLOTHIAN, SCOTLAND
[4] USN, RES LAB, WASHINGTON, DC 20375 USA
[5] NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA
[6] NOAA, CLIMATE MONITORING & DIAGNOST LAB, BOULDER, CO 80303 USA
[7] HARVARD SMITHSONIAN CTR ASTROPHYS, CAMBRIDGE, MA 02138 USA