Balloon-borne stratospheric BrO measurements: comparison with Envisat-SCIAMACHY BrO limb profilesReport as inadecuate

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1 Institut für Umweltphysik 2 LPMAA - Laboratoire de Physique Moleculaire pour l-Atmosphere et l-Astrophysique 3 Institute of Atmospheric Science 4 Institute for Atmosphere and Environment 5 SA - Service d-aéronomie 6 Institut für Meteorologie Berlin 7 BIRA-IASB - Belgian Institute for Space Aeronomy - Institut d-Aéronomie Spatiale de Belgique 8 Forschungszentrum Jülich GmbH 9 CfA - Harvard-Smithsonian Center for Astrophysics

Abstract : For the first time, results of all four existing stratospheric BrO profiling instruments, are presented and compared with reference to the SLIMCAT 3-dimensional chemical transport model 3-D CTM. Model calculations are used to infer a BrO profile validation set, measured by 3 different balloon sensors, for the new Envisat-SCIAMACHY ENVIronment SATellite-SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY satellite instrument. The balloon observations include a balloon-borne in situ resonance fluorescence detection of BrO, b balloon-borne solar occultation DOAS measurements Differential Optical Absorption Spectroscopy of BrO in the UV, and c BrO profiling from the solar occultation SAOZ Systeme d-Analyse par Observation Zenithale balloon instrument. Since stratospheric BrO is subject to considerable diurnal variation and none of the measurements are performed close enough in time and space for a direct comparison, all balloon observations are considered with reference to outputs from the 3-D CTM. The referencing is performed by forward and backward air mass trajectory calculations to match the balloon with the satellite observations. The diurnal variation of BrO is considered by 1-D photochemical model calculation along the trajectories. The 1-D photochemical model is initialised with output data of the 3-D model with additional constraints on the vertical transport, the total amount and photochemistry of stratospheric bromine as given by the various balloon observations. Total Bry=20.1±2.8pptv obtained from DOAS BrO observations at mid-latitudes in 2003, serves as an upper limit of the comparison. Most of the balloon observations agree with the photochemical model predictions within their given error estimates. First retrieval exercises of BrO limb profiling from the SCIAMACHY satellite instrument agree to

Author: M. Dorf - H. Bösch - A. Butz - C. Camy-Peyret - M. P. Chipperfield - A. Engel - F. Goutail - K. Grunow - F. Hendrick - S. Hrecha



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