Nitrogen partitioning in summer mid-latitudes and the late winter arctic vortex, measured by MIPAS-B - Wetzel, G.; Oelhaf, H.; Ruhnke, R.; Kouker, W.; Friedl-Vallon, F.; Kleinert, A.; Maucher, G.; Seefeldner, M.; Stowasser, M.; Trieschmann, O.; Clarmann, T. von; Fischer, H. (2000)