Altitude Retrieval Algorithms for OMPS: Sensitivity to Aerosols, Surface Reflectance and Stray Light.

Details Altitude Retrieval Algorithms for OMPS: Sensitivity to Aerosols, Surface Reflectance and Stray Light. Altitude Retrieval Algorithms for OMPS: Sensitivity to Aerosols, Surface Reflectance and Stray Light.

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.a43b0092l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #A43B-0092

Physics

0300 Atmospheric Composition And Structure, 1640 Remote Sensing (1855), 3300 Atmospheric Processes

Scientific paper

The Ozone Mapping and Profiler Suite (OMPS) will provide the operational ozone data products from the NPOESS suite of satellites. Vertical ozone profiles are derived from the OMPS Limb Profiler (LP) instrument, which measures solar limb scattering in the spectral range from 290 to 1000 nm. With all satellite-based limb measurement techniques, accurate retrieval of atmospheric constituent profiles depends critically on assigning accurate tangent altitude values to the radiance measurements. This is particularly true for the limb scattering technique, which lacks any source reference direction (as, e.g., with solar or stellar occultation) and thus relies on absolute pointing information available from satellite ephemeris and engineering data. If this pointing information is not sufficiently accurate it must be supplemented by some method for retrieving altitudes directly from the measured radiance profiles. A number of techniques have been used, all based on the same general approach - altitudes are adjusted to minimize the difference between measured radiances and forward model predictions in some set of UV channels. The model/data fit is generally done above 30 km to minimize the effects due to aerosols and surface characterization. In this poster we compare different approaches to the OMPS altitude retrieval, and attempt to quantify errors in the retrieved altitudes due to several sources. Primary forward model errors include uncertainties in atmospheric aerosol and surface reflectance properties, and errors in the input temperature, pressure and ozone profiles used in the radiative transfer calculations. We also consider the effect of radiometric errors due to incomplete stray light characterization in the instrument model. The goal of this study is to determine an optimal range of wavelengths and altitudes for use in the OMPS altitude retrievals, and the most efficient order in which to retrieve aerosol, surface albedo and altitude information.

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