Air Quality Processes Research Division, Meteorological Service of Canada, Centre For Atmospheric Research Experiments R.R.#1, Egbert, ON L0L1N0 Canada
Department of Physics McGill University, 3600 University Street, Montreal, ON H3A2T8 Canada ;
Department of Physics McGill University, 3600 University Street, Montreal, ON H3A2T8 Canada ;
Laboratoire de modelisation en mecanique, case 162 U.P.et M. Curie, 4 Pl. Jussieu, Paris, 75005 France ;