Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 3 2009 10.5194/acpd-9-11811-2009 http://www.atmos-chem-phys-discuss.net/9/11811/2009/ http://www.atmos-chem-phys-discuss.net/9/11811/2009/acpd-9-11811-2009.html http://www.atmos-chem-phys-discuss.net/9/11811/2009/acpd-9-11811-2009.pdf 11811 11841 2009-05-13 Evaluation of tropospheric ozone columns derived from assimilated GOME ozone profile observations A. T. J. de Laat laatdej@knmi.nl R. J. van der A M. van Weele Royal Netherlands Metrological Institute (KNM), The Netherlands Tropospheric O₃ column estimates are produced and evaluated from spaceborne O₃ observations by the subtraction of assimilated O₃ profile observations from total column observations, the so-called Tropospheric O₃ ReAnalysis or TORA method. Here we apply the TORA method to six years (1996–2001) of ERS-2 GOME/TOMS total O₃ and ERS-2 GOME O₃ profile observations using the TM5 global chemistry-transport model with a linearized O₃ photochemistry parameterization scheme. <br><br> Free running TM5 simulations show good agreement with O₃ sonde observations in the upper-tropospheric and lower stratospheric (UTLS). Assimilation of GOME O₃ profile observations improves the comparisons in the tropical UTLS region but slightly degrades the model-to-sonde comparisons in the extra-tropical UTLS for both short day-do-day variability as well as for monthly means. We suggest that this degradation is related to the large ground pixel size of the GOME O₃ measurements (960&times;100 km) in combination with retrieval and calibration errors. The assimilation of GOME O₃ profile observations does counter the gradual multiyear mid-latitude stratospheric O₃ accumulation caused by the overstrong stratospheric meridional circulation in TM5. <br><br> The evaluation of daily and monthly tropospheric O₃ columns obtained from total column observations and using the TORA methodology shows realistic residuals within the tropics but unrealistically large deviations outside of the tropics, although average biases remain small for the monthly means. The findings of this paper suggest that improvements can be expected by using O₃ observations from present-day instruments like MetOp/GOME-2 and EOS-AURA/OMI. Balis, D., Lambert, J.-C., van Roozendael, M., Spurr, R., Loyola, D., Livschitz, Yl., Valks, P., Amiridis, V., Gerard, P., Granville, J., and Zehner, C.: Ten years of GOME/ERS-2 total ozone data: the new GOME Data Processor (GDP) Version 4: II. Ground-based validation and comparisons with TOMS V7/V8, J. Geophys. 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