Subtropical trace gas profiles determined by ground-based FTIR spectroscopy at Izaña (28N, 16W): Five-year record, error analysis, and comparison with 3-D CTMs M. Schneider, T. Blumenstock, M. P. Chipperfield, F. Hase, W. Kouker, T. Reddmann, R. Ruhnke, E. Cuevas, and H. Fischer IMK-ASF, Forschungszentrum Karlsruhe, Karlsruhe, Germany Institute for Atmospheric Science, University of Leeds, Leed...