Subtropical tropospheric wave forcing of planetary wave 2 in the prephase of the Stratospheric Sudden Warming Event in January 2009

Dieter Herbert Werner Peters1, Andrea Schneidereit2, Christian M. Grams3, Julian F. Quinting4, Julia Henriette Keller5, Gabriel A. Wolf6, Franziska Teubler6, Michael Riemer6 and Olivia Romppainen-Martius7, (1)University of Rostock, Rostock, Germany, (2)Leibniz-IAP, University of Rostock, Kuehlungsborn, Germany, (3)ETH Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland, (4)ETH-Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland, (5)Deutscher Wetterdienst, Offenbach, Germany, (6)Johannes Gutenberg-University, Institute for Atmospheric Physics, Mainz, Germany, (7)University of Bern, Institute of Geography, Bern, Switzerland