Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/19200
Title: ULIRS, an optimal estimation retrieval scheme for carbon monoxide using IASI spectral radiances: sensitivity analysis, error budget and simulations
Authors: Illingworth, S.M.
Remedios, John J.
Boesch, H.
Moore, D.P.
Sembhi, H.
Dudhia, A.
Walker, J.C.
First Published: 2011
Publisher: COPERNICUS GESELLSCHAFT MBH on behalf of European Geosciences Union (EGU)
Citation: ATMOSPHERIC MEASUREMENT TECHNIQUES, 2011, 4 (2), pp. 269-288
Abstract: 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.
DOI Link: 10.5194/amt-4-269-2011
ISSN: 1867-1381
eISSN: 1867-8548
Links: http://hdl.handle.net/2381/19200
http://www.atmos-meas-tech.net/4/269/2011/amt-4-269-2011.html
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2011 The authors. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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