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| Titel |
Ozone production in remote oceanic and industrial areas derived from ship based measurements of peroxy radicals during TexAQS 2006 |
| VerfasserIn |
R. Sommariva, S. S. Brown, J. M. Roberts, D. M. Brookes, A. E. Parker, P. S. Monks, T. S. Bates, D. Bon, J. A. Gouw, G. J. Frost, J. B. Gilman, P. D. Goldan, S. C. Herndon, W. C. Kuster, B. M. Lerner, H. D. Osthoff, S. C. Tucker, C. Warneke, E. J. Williams, M. S. Zahniser |
| 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. 6 ; Nr. 11, no. 6 (2011-03-16), S.2471-2485 |
| Datensatznummer |
250009502
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| Publikation (Nr.) |
 copernicus.org/acp-11-2471-2011.pdf |
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| Zusammenfassung |
During the Texas Air Quality Study II (TexAQS 2006) campaign, a
PEroxy Radical Chemical Amplifier (PERCA) was deployed on the NOAA
research vessel R/V Brown to measure total peroxy radicals
(HO2+Σ RO2). Day-time mixing ratios of HO2+Σ RO2 between 25 and
110 ppt were observed throughout the study area – the
Houston/Galveston region and the Gulf coast of the US – and
analyzed in relation to measurements of nitrogen oxides, volatile
organic compounds (VOC) and photolysis rates to assess radical
sources and sinks in the region.
The measurements of HO2+Σ RO2 were used to calculate the in-situ net
photochemical formation of ozone. Measured median values ranged from
0.6 ppb/h in clean oceanic air masses up to several tens of
ppb/h in the most polluted industrial areas. The results are
consistent with previous studies and generally agree with
observations made during the previous TexAQS 2000 field
campaign. The net photochemical ozone formation rates determined at
Barbours Cut, a site immediately south of the Houston Ship Channel,
were analyzed in relation to local wind direction and VOC reactivity
to understand the relationship between ozone formation and local VOC
emissions.
The measurements of HO2+Σ RO2 made during the R/V Brown TexAQS 2006
cruise indicate that ozone formation is NOx-limited in the
Houston/Galveston region and influenced by highly reactive
hydrocarbons, especially alkenes from urban and industrial sources
and their photo-oxidation products, such as formaldehyde. |
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