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The PROMOTE ozone profile record assimilation project: validation and model cross-comparison

Frank Baier(1), Thilo Erbertseder(1), Quentin Errera(2), Sebastien Viscardy(2) and Jörg Schwinger(3)

(1) German Aerospace Center, Oberpfaffenhofen, 82234 Wessling, Germany
(2) Belgian Institute for Space Aeronomy, Ringlaan-3-Avenue Circulaire, B-1180 Brussels, Belgium
(3) University Cologne, Aachener Straße 209, 50931 Cologne, Germany

Abstract

The 3D ozone reanalysis subproject of ESA's GSE PROMOTE aims at providing global continuous three-dimensional records of stratospheric ozone fields and related key species (www.gse-promote.org). Two 4D-var data assimilation systems are applied at DLR and BIRA-IASB to process basically level 2 ozone data derived from the instruments UARS/MLS, ERS2/GOME, MIPAS and MetOp/GOME2 covering the years 1992-1999, 1996-2003, 2002-2004 and 2007-today respectively. The overlapping time periods allow for cross-validation of the assimilation schemes and chemistry-transport models (CTMs) applied. Besides presenting a first evaluation of the PROMOTE ozone record by comparisons to independent satellite and ground-based measurements, we discuss systematic differences between respective results assimilating the same MIPAS data from April-December 2003. It is evident that the applied CTMs BASCOE and SACADA show different characteristics. We analyze results for conditions where gas phase or aerosol chemistry is prevalent. A sequential assimilation scheme based on ROSE/DLR is used to highlight the influence of observations on results.