[1] Univ Paris 06, CNRS, Serv Aeron, F-75252 Paris 05, France
[2] York Univ, Inst Space & Terr Sci, Downsview, ON M3J 3K1, Canada
[3] York Univ, Dept Phys & Astron, Downsview, ON M3J 3K1, Canada
[4] Deutsch Wetterdienst, D-82383 Hohenpeissenberg, Germany
[5] Jet Prop Lab, Table Mt Facil, Wrightwood, CA 92397 USA
[6] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[7] Natl Inst Environm Studies, Tsuchiura, Ibaraki 305, Japan
[8] Natl Inst Publ Hlth & Environm Protect, NL-3720 BA Bilthoven, Netherlands
[9] Meteorol Res Inst, Tsukuba, Ibaraki 305, Japan
[10] Alfred Wagner Inst Polar & Marine Res, D-14473 Potsdam, Germany