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ULIRS, an optimal estimation retrieval scheme for carbon monoxide using IASI spectral radiances: sensitivity analysis, error budget and simulations

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posted on 2012-10-24, 09:06 authored by S.M. Illingworth, John J. Remedios, H. Boesch, D.P. Moore, H. Sembhi, A. Dudhia, J.C. Walker
This paper presents a new retrieval scheme for tropospheric carbon monoxide (CO), using measured radiances from the Infrared Atmospheric Sounding Interferometer (IASI) onboard the MetOp-A satellite. The University of Leicester IASI Retrieval Scheme (ULIRS) is an optimal estimation retrieval scheme, which utilises equidistant pressure levels and a floating pressure grid based on topography. It makes use of explicit digital elevation and emissivity information, and incorporates a correction for solar surface reflection in the daytime with a high resolution solar spectrum. The retrieval scheme has been assessed through a formal error analysis, via the simulation of surface effects and by an application to real IASI data over a region in Southern Africa. The ULIRS enables the retrieval of between 1 and 2 pieces of information about the tropospheric CO vertical profiles, with peaks in the sensitivity at approximately 5 and 12 km. Typical errors for the African region relating to the profiles are found to be ~20% at 5 and 12 km, and on the total columns to range from 18 to 34%. Finally the performance of the ULIRS is shown for a range of simulated geophysical conditions.

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Citation

ATMOSPHERIC MEASUREMENT TECHNIQUES, 2011, 4 (2), pp. 269-288

Version

  • VoR (Version of Record)

Published in

ATMOSPHERIC MEASUREMENT TECHNIQUES

Publisher

COPERNICUS GESELLSCHAFT MBH on behalf of European Geosciences Union (EGU)

issn

1867-1381

eissn

1867-8548

Copyright date

2011

Available date

2012-10-24

Publisher version

http://www.atmos-meas-tech.net/4/269/2011/amt-4-269-2011.html

Language

English

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