[1] Max Planck Inst Meteorol, Bundesstr 53, D-20146 Hamburg, Germany
[2] Deutsch Wetterdienst, Offenbach, Germany
[3] Free Univ Berlin, Inst Meteorol, Berlin, Germany
[4] Karlsruhe Inst Technol, Inst Meteorol & Climate Res IMK TRO, Karlsruhe, Germany
[5] Univ Hamburg, Inst Oceanog, Ctr Earth Syst Res & Sustainabil CEN, Hamburg, Germany
[6] GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany
[7] Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany
[8] Univ Reading, Dept Meteorol, Reading, Berks, England