Retrieval of Minor Species Densities From Limb Scatter Measurements by OSIRIS on Odin Using a Modified Onion Peeling Method

Details Retrieval of Minor Species Densities From Limb Scatter Measurements by OSIRIS on Odin Using a Modified Onion Peeling Method Retrieval of Minor Species Densities From Limb Scatter Measurements by OSIRIS on Odin Using a Modified Onion Peeling Method

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa31a..09a&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA31A-09

Other

3260 Inverse Theory, 0340 Middle Atmosphere: Composition And Chemistry, 0394 Instruments And Techniques

Scientific paper

In this paper we present a Modified Onion Peeling (MOP) method to retrieve minor species densities from UV-visible limb scatter measurements by OSIRIS on Odin. We retrieve vertical profiles of ozone, NO2, OClO and BrO densities, and also aerosol and Rayleigh extinction from a limb scan between altitudes 60 (alternatively 120 km) to 7 km. The MOP method uses the whole UV-visible spectral range of OSIRIS. The large number of wavelength points minimizes the sensitivity of the retrieval to measurement noise. In order to relax requirements on absolute calibration the measurements are divided with a reference measurement made at a high tangent altitude by the same instrument. Multiple scattering is taken into account by pre-calculated total to single scattering radiance ratios tabulated as a function of wavelength, tangent altitude and several other relevant parameters. Our method uses air density profiles from ECMWF as a prior data for the simulation of the reference spectrum. A corresponding temperature profile from ECMWF is used also as a prior during the inversion process. The method uses absolute cross sections. We approximate the atmosphere to be locally spherically symmetric. The inversion is handled as a non-linear problem and several constituents are inverted simultaneously. We show first retrieval results from selected OSIRIS scans. These results are compared against validating measurements. Odin is a Swedish-led satellite project funded jointly by Sweden (SNSB), Canada (CSA), Finland (Tekes) and France (CNES).

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