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| Titel |
Inferring ozone production in an urban atmosphere using measurements of peroxynitric acid |
| VerfasserIn |
K. M. Spencer, D. C. McCabe, J. D. Crounse, J. R. Olson, J. H. Crawford, A. J. Weinheimer, D. J. Knapp, D. D. Montzka, C. A. Cantrell, R. S. Hornbrook, R. L. Mauldin III, P. O. Wennberg |
| 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 ; 9, no. 11 ; Nr. 9, no. 11 (2009-06-08), S.3697-3707 |
| Datensatznummer |
250007360
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| Publikation (Nr.) |
 copernicus.org/acp-9-3697-2009.pdf |
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| Zusammenfassung |
| Observations of peroxynitric acid (HO2NO2) obtained simultaneously
with those of NO and NO2 provide a sensitive measure of the
ozone photochemical production rate. We illustrate this technique for
constraining the ozone production rate with observations obtained from the
NCAR C-130 aircraft platform during the Megacity Initiative: Local and Global
Research Observations (MILAGRO) intensive in Mexico during the spring of
2006. Sensitive and selective measurements of HO2NO2 were made in
situ using chemical ionization mass spectrometry (CIMS). Observations were
compared to modeled HO2NO2 concentrations obtained from the NASA
Langley highly-constrained photochemical time-dependent box model. The median
observed-to-calculated ratio of HO2NO2 is 1.18. At NOx
levels greater than 15 ppbv, the photochemical box model underpredicts
observations with an observed-to-calculated ratio of HO2NO2 of 1.57.
As a result, we find that at high NOx, the ozone production rate
calculated using measured HO2NO2 is faster than predicted using
accepted photochemistry. Inclusion of an additional HOx source from
the reaction of excited state NO2 with H2O or reduction in
the rate constant of the reaction of OH with NO2 improves the
agreement. |
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