Increased Northern Hemispheric CO burden in the troposphere in 2002 and 2003 detected from the ground and from a satellite

P. Duchatelet, A.V. Dzhola, D. P. Edwards, F. Hase, I. Kramer, E. Mahieu, J. Mellqvist, J. Notholt, P. C. Novelli, H.-E. Scheel, Matthias Schneider, A. Schulz, A. Strandberg, R. Sussmann, H. Tanimoto, V. Velazko, J.R. Drummond, J.C. Gille