MIPAS observations of chlorine species (ClONO2, ClO, HOCl) and chemically related trace gases during Arctic and Antarctic winters since 2002 - Clarmann, T. von; Stiller, G.; Glatthor, N.; Höpfner, M.; Chauhan, S.; Funke, B.; Grabowski, U.; Kellmann, S.; Kiefer, M.; Linden, A.; Lopez-Puertas, M. (2008)