Publication


S. M. Illingworth, et al.
ULIRS, an optimal estimation retrieval scheme for carbon monoxide using IASI spectral radiances: sensitivity analysis, error budget and simulations
Atmospheric Measurement Techniques, 4(2), 269-288, 2011; doi: 10.5194/amt-4-269-2011
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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.

Reference


@article{amt-4-269-2011,
  author = "S. M. Illingworth and J. J. Remedios and H. Boesch and D. P. Moore and H. Sembhi and A. Dudhia and J. C. Walker",
  title = "ULIRS, an optimal estimation retrieval scheme for carbon monoxide using IASI spectral radiances: sensitivity analysis, error budget and simulations",
  year = 2011,
  journal = "Atmospheric Measurement Techniques",
  volume = 4,
  number = 2,
  pages = "269-288",
  month = "Feb",
  doi = "10.5194/amt-4-269-2011",
  url = "https://www.atmos-meas-tech.net/4/269/2011/"
}
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