We acknowledge the efforts of Rex Gibson and the ERA team at ECMWF in creating the reanalysis data used in this study and Paul Berrisford in making it available to us. For the NCEP data, thanks go to the Climate Diagnostics Center (CDC) for making the pressure level data available and to NCAR for supplying the NCEP PV data. The GEOS1 data were supplied by the Goddard Space Flight Center Distributed Active Archive Center. This research was in part supported by the EC Environment and Climate Research Programme Contract ENV4-CT97-0499, Climate and Natural Hazards.
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