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| Titel |
Diurnal variation of midlatitudinal NO3 column abundance over table mountain facility, California |
| VerfasserIn |
C. M. Chen, R. P. Cageao, L. Lawrence, J. Stutz, R. J. Salawitch, L. Jourdain, Q. Li, S. P. Sander |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2011-02-02), S.963-978 |
| Datensatznummer |
250009285
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| Publikation (Nr.) |
 copernicus.org/acp-11-963-2011.pdf |
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| Zusammenfassung |
| The column abundance of NO3 was measured over Table Mountain Facility, CA
(34.4° N, 117.7° W) from May 2003 through September 2004, using lunar
occultation near full moon with a grating spectrometer. The NO3 column retrieval
was performed with the differential optical absorption spectroscopy (DOAS) technique using
both the 623 and 662 nm NO3 absorption bands. Other spectral features such as Fraunhofer
lines and absorption from water vapor and oxygen were removed using solar spectra obtained at
different airmass factors. We observed a seasonal variation, with nocturnally averaged NO3
columns between 5−7 × 1013 molec cm−2 during October through
March, and 5−22 × 1013 molec cm−2 during April through September.
A subset of the data, with diurnal variability vastly different from the temporal profile
obtained from one-dimensional stratospheric model calculations, clearly has boundary layer
contributions; this was confirmed by simultaneous long-path DOAS measurements. However,
even the NO3 columns that did follow the modeled time evolution were often much
larger than modeled stratospheric partial columns constrained by realistic temperatures
and ozone concentrations. This discrepancy is attributed to substantial tropospheric
NO3 in the free troposphere, which may have the same time dependence as stratospheric NO3. |
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