Atmospheric Measurement Techniques www.atmos-meas-tech.net 1867-1381 1867-8548 3 4 2010 10.5194/amt-3-1019-2010 http://www.atmos-meas-tech.net/3/1019/2010/ http://www.atmos-meas-tech.net/3/1019/2010/amt-3-1019-2010.html http://www.atmos-meas-tech.net/3/1019/2010/amt-3-1019-2010.pdf 1019 1027 2010-08-11 Retrievals from GOMOS stellar occultation measurements using characterization of modeling errors V. F. Sofieva viktoria.sofieva@fmi.fi J. Vira E. Kyrölä J. Tamminen V. Kan F. Dalaudier A. Hauchecorne J.-L. Bertaux D. Fussen F. Vanhellemont G. Barrot O. Fanton d'Andon Earth observation, Finnish Meteorological Institute, Helsinki, Finland Organization of Russian Academy of Sciences A.M. Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia Université Versailles St-Quentin, UPMC Univ. Paris 06, CNRS/INSU, LATMOS-IPSL, 78280 Guyancourt France Institut d'Aeronomie Spatiale de Belgique, Brussels, Belgium ACRI-ST, Sophia-Antipolis, France In this paper, we discuss the development of the inversion algorithm for the GOMOS (Global Ozone Monitoring by Occultation of Star) instrument on board the Envisat satellite. The proposed algorithm takes accurately into account the wavelength-dependent modeling errors, which are mainly due to the incomplete scintillation correction in the stratosphere. The special attention is paid to numerical efficiency of the algorithm. The developed method is tested on a large data set and its advantages are demonstrated. Its main advantage is a proper characterization of the uncertainties of the retrieved profiles of atmospheric constituents, which is of high importance for data assimilation, trend analyses and validation. Dalaudier, F., Kan, V., and Gurvich, A. S.: Chromatic refraction with global ozone monitoring by occultation of stars. I. Description and scintillation correction, Applied Opt., 40, 866–877, 2001. Hauchecorne, A., Bertaux, J L., Dalaudier, F., et al.: First simultaneous global measurements of nighttime stratospheric NO₂ and NO₃ observed by Global Ozone Monitoring by Occultation of Stars (GOMOS)/Envisat in 2003, J. Geophys. Res., 110(D18), D18301, doi:10.1029/2004JD005711, 2005. Kyrölä, E., Sihvola, E., Kotivuori, Y., Tikka, M., Tuomi, T., and Haario, H.: Inverse theory for occultation measurements: 1. Spectral inversion, J. Geophys. Res., 98, 7367–7381, 1993. Kyrölä E., Tamminen, J., Sofieva, V., Bertaux, J L., Hauchecorne, A., Dalaudier, F., Fussen, D., Vanhellemont, F., Fanton d'Andon, O., Barrot, G., Guirlet, M., Mangin, A., Blanot, L., Fehr, T., Saavedra de Miguel, L., and Fraisse, R.: Retrieval of atmospheric parameters from GOMOS data, Atmos. Chem. Phys. Discuss., 10, 10145–10217, doi:10.5194/acpd-10-10145-2010, 2010. Polyakov, A. V., Timofeev, Ju. M., Gurvich, A. S., Vorob'ev, V V., Kan, V., and Yee, J.-H.: Effect of Stellar Scintillations on the Errors in Measuring the Ozone Content of the Atmosphere, Izv., Atm. Ocean. Phys. (Engl. transl.), 37(1), 51–60, 2001. Press, W H., Teukolsky, S A., Vetterling, W T., and Flannery, B P.: Numerical Recipes in FORTRAN, The Art of Scientific Computing, Clarendon Press, Oxford, 1992. Sofieva, V F., Tamminen, J., Haario, H., Kyrölä, E., and Lehtinen, M.: Ozone profile smoothness as a priori information in the inversion of limb measurements, Ann. Geophys., 22, 3411–3420, doi:10.5194/angeo-22-3411-2004, 2004. Sofieva, V F., Kyrölä, E., Hassinen, S., et al.: Global analysis of scintillation variance: Indication of gravity wave breaking in the polar winter upper stratosphere, Geophys. Res. Lett., 34, L03812, doi:10.1029/2006GL028132, 2007. Sofieva, V F., Kan, V., Dalaudier, F., Kyrölä, E., Tamminen, J., Bertaux, J.-L., Hauchecorne, A., Fussen, D., and Vanhellemont, F.: Influence of scintillation on quality of ozone monitoring by GOMOS, Atmos. Chem. Phys., 9, 9197–9207, doi:10.5194/acp-9-9197-2009, 2009. Tamminen, J., Kyrölä, E., and Sofieva, V.: Does a priori information improve occultation measurements?, in: Occultations for Probing Atmosphere and Climate, edited by: Kirchengast, G., Foelshe, U., and Steiner, A., Springer Verlag, 2004, 87–98, 2004. Tamminen, J., Kyrölä, E., Sofieva, V F., Laine, M., Bertaux, J.-L., Hauchecorne, A., Dalaudier, F., Fussen, D., Vanhellemont, F., Fanton-d'Andon, O., Barrot, G., Mangin, A., Guirlet, M., Blanot, L., Fehr, T., Saavedra de Miguel, L., and Fraisse, R.: GOMOS data characterization and error estimation, Atmos. Chem. Phys. Discuss., 10, 6755–6796, doi:10.5194/acpd-10-6755-2010, 2010.