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19 November 2015 Levenberg-Marquardt method with simultaneous calculations of averaging kernels and errors for methane retrieval from IASI spectra
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Proceedings Volume 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics; 968071 (2015) https://doi.org/10.1117/12.2205948
Event: XXI International Symposium Atmospheric and Ocean Optics. Atmospheric Physics, 2015, Tomsk, Russian Federation
Abstract
Levenberg-Marquardt method parameter selection for methane vertical profile retrieval from IASI/METOP spectra is presented. A modified technique for iterative calculation of averaging kernels and a posteriori errors for every spectrum is suggested. Known from literature method is expanded for the case of absence of a priori statistics for methane vertical profiles. Software for massive processing of IASI spectra using is developed. Effect of LM parameter selection on averaging kernel norm and a posteriori errors is illustrated. NCEP reanalysis data provided by ESRL (NOAA, Boulder, USA) were taken as initial guess. Surface temperature, temperature and humidity vertical profiles are retrieved before methane vertical profile retrieval.
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M. Yu. Khamatnurova and K. G. Gribanov "Levenberg-Marquardt method with simultaneous calculations of averaging kernels and errors for methane retrieval from IASI spectra", Proc. SPIE 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics, 968071 (19 November 2015); https://doi.org/10.1117/12.2205948
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