Lower and middle stratospheric profiles of nitrogen dioxide observed by OSIRIS

Details Lower and middle stratospheric profiles of nitrogen dioxide observed by OSIRIS Lower and middle stratospheric profiles of nitrogen dioxide observed by OSIRIS

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa32b..05s&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA32B-05

Physics

Optics

0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 0360 Transmission And Scattering Of Radiation, 0394 Instruments And Techniques, 0649 Optics

Scientific paper

Vertical profiles of nitrogen dioxide in the 20-38 km altitude range are successfully retrieved over the globe from OSIRIS limb scatter observations in the late summer and early fall of 2001. The inclusion of multiple scattering in the radiative transfer model used in the inversion algorithm allows for the retrieval of NO2 down to 20 km. The slant column densities, which constitute the observations in the inversion, are obtained by fitting the fine structure in normalized radiance spectra over 435-449 nm, where NO2 electronic absorption is readily observable due to long light paths through stratospheric layers rich in this constituent. Details of the spectral fitting and inversion algorithm are discussed, including the discovery of a pseudo-absorber associated with pixelated detectors and a new method to verify altitude registration. Comparisons are made with spatially and temporally coincident in-situ and remote profile measurements of this photochemically active trace gas. Longitudinal, latitudinal, and diurnal variations are illustrated

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