References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-11-2471-2011

Ozone production in remote oceanic and industrial areas derived from ship based measurements of peroxy radicals during TexAQS 2006

Sommariva

¹ ² ⁶ Brown

S. S.

¹ Roberts

J. M.

¹ Brookes

D. M.

³ ⁷ Parker

A. E.

³ ⁸ Monks

P. S.

³ Bates

T. S.

⁴ Bon

¹ ² de Gouw

J. A.

¹ ² Frost

G. J.

¹ ² Gilman

J. B.

¹ ² Goldan

P. D.

¹ ² Herndon

S. C.

⁵ Kuster

W. C.

¹ ² Lerner

B. M.

¹ ² Osthoff

H. D.

¹ ² ⁹ Tucker

S. C.

¹ ² ¹⁰ Warneke

¹ ² Williams

E. J.

¹ ² Zahniser

M. S.

⁵

Earth System Research Laboratory, NOAA, Boulder, CO, USA

CIRES, University of Colorado, Boulder, CO, USA

Department of Chemistry, University of Leicester, Leicester, UK

Pacific Marine Environmental Laboratory, NOAA, Seattle, WA, USA

Aerodyne Research, Inc., Billerica, MA, USA

now at: School of Environmental Sciences, University of East Anglia, Norwich, UK

now at: Air Quality Practice, AEA plc., Harwell, Didcot, UK

now at: PC2A, Universit{é} des Sciences et Technologies de Lille, Lille, France

now at: Department of Chemistry, University of Calgary, Calgary, Canada

now at: Ball Aerospace & Technologies Corp., Boulder, CO, USA

16 03 2011

11 6 2471 2485

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/2471/2011/acp-11-2471-2011.pdf

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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