Retrieval of Stratospheric O3 and NO2 Profiles From a DOAS Analysis of Limb-Radiance Spectra Measured by OSIRIS

Details Retrieval of Stratospheric O3 and NO2 Profiles From a DOAS Analysis of Limb-Radiance Spectra Measured by OSIRIS Retrieval of Stratospheric O3 and NO2 Profiles From a DOAS Analysis of Limb-Radiance Spectra Measured by OSIRIS

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa31a..05h&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA31A-05

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0300 Atmospheric Composition And Structure, 0340 Middle Atmosphere: Composition And Chemistry, 0360 Transmission And Scattering Of Radiation, 0394 Instruments And Techniques

Scientific paper

A method that has proved successful for analysing UV-visible measurements made with ground-based instruments and with satellite nadir-viewing instruments has been that of Differential Optical Absorption Spectroscopy (DOAS). With the DOAS method absorption features are used to recover slant column densities which are then converted to vertical column densities through calculated air mass factors. Here we present the application of the DOAS method to limb scattered sunlight. In this application, apparent column densities are calculated through an analysis of measured limb radiances in a similar fashion as the calculation of the slant column densities in other applications. The complication here is that there is no straightforward relationship between these apparent column densities and the vertical column density. We describe how these apparent column densities, measured over a range of tangent heights, may be inverted using the Optimal Estimation (OE) approach to determine local density profiles, and apply the technique to the retrieval of stratospheric O3 and NO2 from limb-radiance spectra measured by the OSIRIS instrument on the Odin satellite.

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