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ACE retrievals using Atmosphit, a user friendly fitting software based on the optimal estimation method.

Daniel Hurtmans(1), Pierre-Fran├žois Coheur(1), Cathy Clerbaux(1,2), Peter Bernath(3) and Chris Boone(3)

(1) Universite Libre de Bruxelles, 50 Av. F.D. Roosevelt, B-1050 Bruxelles, Belgium
(2) Institut Pierre-Simon Laplace, 4, place Jussieu, 75005 Paris, France
(3) University of Waterloo, Department of Chemistry, Waterloo, ON, N2L 3G1, Canada

Abstract

A software running under MS-Windows operating system has been developed at ULB in order to simulate atmospheric infrared FTIR spectra and to retrieve vertical profiles of molecular abundances using the optimal estimation method (OEM). The software can handle several geometries (ground based direct solar absorption, space borne nadir observations and solar occultations) on single or multiple spectra. Output files allow for instance characterizing the retrievals for information content and error budget analyses. Atmosphit has been adapted to the instrumental properties of the Atmospheric Chemistry Experiment (ACE) instrument flying onboard the Canadian SCISAT satellite and applied to series of occultations on ozone and carbon monoxide retrievals.

Selected examples will be presented to pinpoint the major sources of error and the possible discrepancies between operational and OEM retrieved vertical profiles.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry