References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-12-8009-2012

Insights into hydroxyl measurements and atmospheric oxidation in a California forest

Mao

¹ ² Ren

³ Zhang

⁴ Van Duin

D. M.

⁴ Cohen

R. C.

⁵ Park

J.-H.

⁶ Goldstein

A. H.

⁶ Paulot

⁷ ¹¹ Beaver

M. R.

⁷ ¹² Crounse

J. D.

⁷ Wennberg

P. O.

⁷ DiGangi

J. P.

⁸ ¹³ Henry

S. B.

⁸ Keutsch

F. N.

⁸ Park

⁹ ¹⁴ Schade

G. W.

⁹ Wolfe

G. M.

¹⁰ ¹⁵ Thornton

J. A.

¹⁰ Brune

W. H.

⁴

Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, USA

Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ, USA

Air Resources Laboratory, NOAA, Silver Spring, MD, USA

Department of Meteorology, Pennsylvania State University, University Park, PA, USA

Department of Chemistry and Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA, USA

Department of Environmental Science, Policy, and Management, University of California Berkeley, Berkeley, CA, USA

Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA

Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA

Department of Atmospheric Sciences, Texas A&M University, College Station, TX, USA

Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA

now at: School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA

now at: National Exposure Research Laboratory, Environmental Protection Agency, Research Triangle Park, NC, USA

now at: Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, USA

now at: Department of Atmospheric Environmental Sciences, Pusan National University, South Korea

now at: Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA

07 09 2012

12 17 8009 8020

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.

This article is available from http://www.atmos-chem-phys.net/12/8009/2012/acp-12-8009-2012.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/8009/2012/acp-12-8009-2012.pdf

The understanding of oxidation in forest atmospheres is being challenged by measurements of unexpectedly large amounts of hydroxyl (OH). A significant number of these OH measurements were made by laser-induced fluorescence in low-pressure detection chambers (called Fluorescence Assay with Gas Expansion (FAGE)) using the Penn State Ground-based Tropospheric Hydrogen Oxides Sensor (GTHOS). We deployed a new chemical removal method to measure OH in parallel with the traditional FAGE method in a California forest. The new method gives on average only 40–60% of the OH from the traditional method and this discrepancy is temperature dependent. Evidence indicates that the new method measures atmospheric OH while the traditional method is affected by internally generated OH, possibly from oxidation of biogenic volatile organic compounds. The improved agreement between OH measured by this new technique and modeled OH suggests that oxidation chemistry in at least one forest atmosphere is better understood than previously thought.

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