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Insights into hydroxyl measurements and atmospheric oxidation in a California forest

Mao, J. and Ren, X. and Zhang, L. and Van Duin, D. M. and Cohen, R. C. and Park, J.-H. and Goldstein, A. H. and Paulot, F. and Beaver, M. R. and Crounse, J. D. and Wennberg, P. O. and DiGangi, J. P. and Henry, S. B. and Keutsch, F. N. and Park, C. and Schade, G. W. and Wolfe, G. M. and Thornton, J. A. and Brune, W. H. (2012) Insights into hydroxyl measurements and atmospheric oxidation in a California forest. Atmospheric Chemistry and Physics, 12 (17). pp. 8009-8020. ISSN 1680-7316.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Cohen, R. C.0000-0001-6617-7691
Goldstein, A. H.0000-0003-4014-4896
Paulot, F.0000-0001-7534-4922
Crounse, J. D.0000-0001-5443-729X
Wennberg, P. O.0000-0002-6126-3854
DiGangi, J. P.0000-0002-6764-8624
Wolfe, G. M.0000-0001-6586-4043
Thornton, J. A.0000-0002-5098-4867
Brune, W. H.0000-0002-1609-4051
Additional Information:© 2012 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union. Received: 22 February 2012. Published in Atmos. Chem. Phys. Discuss.: 2 March 2012. Revised: 17 August 2012. Accepted: 28 August 2012. Published: 7 September 2012. Edited by: J. Williams. We thank the reviewers for their insightful comments. We acknowledge the contributions from Philip Feiner, Jennifer Gielen, and Josh Magerman for HOx measurements and from Robin Weber for CO and O3 measurements during BEARPEX09 study. We also acknowledge William Stockwell and Wendy Goliff for the RACM2 mechanism. We thank Sierra Pacific Industries for the use of their land and the University of California, Berkeley, Center for Forestry, Blodgett Forest Research Station for cooperation in facilitating this research. We acknowledge the NSF Atmospheric Chemistry Program for the following grants: #0849475 (WHB); #0922562 (AHG); #0852406 (FNK); #0934408 (POW, JDC, and MRB).
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Issue or Number:17
Record Number:CaltechAUTHORS:20121109-150822355
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Official Citation:Mao, J., Ren, X., Zhang, L., Van Duin, D. M., Cohen, R. C., Park, J.-H., Goldstein, A. H., Paulot, F., Beaver, M. R., Crounse, J. D., Wennberg, P. O., DiGangi, J. P., Henry, S. B., Keutsch, F. N., Park, C., Schade, G. W., Wolfe, G. M., Thornton, J. A., and Brune, W. H.: Insights into hydroxyl measurements and atmospheric oxidation in a California forest, Atmos. Chem. Phys., 12, 8009-8020, doi:10.5194/acp-12-8009-2012, 2012.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35400
Deposited By: Ruth Sustaita
Deposited On:09 Nov 2012 23:35
Last Modified:09 Mar 2020 13:19

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