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| Titel |
Odin/OSIRIS observations of stratospheric NO3 through sunrise and sunset |
| VerfasserIn |
C. A. McLinden, C. S. Haley |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 18 ; Nr. 8, no. 18 (2008-09-15), S.5529-5534 |
| Datensatznummer |
250006381
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| Publikation (Nr.) |
 copernicus.org/acp-8-5529-2008.pdf |
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| Zusammenfassung |
| 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
610–680 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
generally 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 our current knowledge of
NO3 photochemistry is generally consistent with OSIRIS observations to
within the limitations of the radiative transfer modeling. Furthermore, they
reveal that OSIRIS possesses signal-to-noise sufficient to make useful
measurements of scattered sunlight out to solar zenith angles of
91–97° and suggest the possibility of retrieving profile information
for NO3 and other species at large solar zenith angles. |
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