Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 5 3 2005 10.5194/acpd-5-2973-2005 http://www.atmos-chem-phys-discuss.net/5/2973/2005/ http://www.atmos-chem-phys-discuss.net/5/2973/2005/acpd-5-2973-2005.html http://www.atmos-chem-phys-discuss.net/5/2973/2005/acpd-5-2973-2005.pdf 2973 2988 2005-05-12 Technical note: A stratospheric climatology for O<sub>3</sub>, H<sub>2</sub>O and CH<sub>4</sub> derived from HALOE measurements J.-U. Grooß J. M. Russell III Institut f&uuml;r Chemie und Dynamik der Geosph&auml;re I: Stratosph&auml;re (ICG I), Forschungszentrum J&uuml;lich, J&uuml;lich, Germany Hampton University, Hampton VA, USA The Halogen Occultation Experiment (HALOE) on board the Upper Atmosphere research satellite (UARS) has observed mixing ratios of important trace species in the stratosphere over more than a decade since 1991. Here we present a climatology for the stratosphere compiled from the HALOE data for ozone, H<sub>2</sub>O and CH<sub>4</sub> for the period from 1991 to 2002. In this approach, the data are averaged over equivalent latitude instead of latitude in order to correctly reproduce the gradients at the transport barriers like the polar vortex edge. The climatology is compiled for 5 degree equivalent latitude bins. The seasonal dependence is taken into account by choosing intervals of one month. The climatology is available as an electronic supplement.