Atmos. Chem. Phys. Discuss., 8, 5901-5917, 2008
www.atmos-chem-phys-discuss.net/8/5901/2008/
doi:10.5194/acpd-8-5901-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Odin/OSIRIS observations of stratospheric NO3 through sunrise and sunset
C. A. McLinden1 and C. S. Haley2
1Environment Canada, Toronto, ON, M3H 5T4, Canada
2Centre for Research in Earth and Space Science, York Univ., Toronto, ON, M3J 1P3, Canada

Abstract. The nitrate radical (NO3) has been detected in visible limb-scattered spectra measured by the Optical Spectrograph and InfraRed Imager System (OSIRIS) on-board the Odin satellite when observing at large solar zenith angles (91–97°). Apparent slant column densities of NO3 at tangent heights between 10 and 45 km are derived via spectral fitting in the 590–680 nm window. Using observations from multiple scans spanning solar zenith angles of 91–97°, the rapid evolution of NO3 through sunrise and sunset can be traced. Slant column densities are found to be consistent with those simulated using a radiative transfer model with coupled photochemistry. In addition, a strong dependence of NO3 with temperature is observed. These results indicate that OSIRIS possesses signal-to-noise sufficient to make useful measurements of scattered sunlight out to solar zenith angles of 96–97° and suggests the possibility of retrieving profile information for NO3 and other species at large solar zenith angles.

Citation: McLinden, C. A. and Haley, C. S.: Odin/OSIRIS observations of stratospheric NO3 through sunrise and sunset, Atmos. Chem. Phys. Discuss., 8, 5901-5917, doi:10.5194/acpd-8-5901-2008, 2008.
 
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