A. Ladstätter-Weißenmayer, J. Meyer-Arnek, A. Richter, F. Wittrock, and J. P. Burrows Institute of Environmental Physics, University of Bremen, P.O. Box 330440, D-28334 Bremen, Germany Received: 26 January 2005 – Accepted: 15 April 2005 – Published: 19 May 2005 Correspondence to: A. Ladstätter-Weißenmayer (lad@iup.physik.uni-bremen.de) © 2005 Author(s). This work is licensed under a Creative Co...