Insights into hydroxyl measurements and atmospheric oxidation in a California forest
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Published:2012-09-07
Issue:17
Volume:12
Page:8009-8020
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
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.,Brune W. H.
Abstract
Abstract. 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.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference64 articles.
1. Bouvier-Brown, N. C., Goldstein, A. H., Gilman, J. B., Kuster, W. C., and de Gouw, J. A.: In-situ ambient quantification of monoterpenes, sesquiterpenes, and related oxygenated compounds during BEARPEX 2007: implications for gas- and particle-phase chemistry, Atmos. Chem. Phys., 9, 5505–5518, https://doi.org/10.5194/acp-9-5505-2009, 2009a. 2. Bouvier-Brown, N. C., Goldstein, A. H., Worton, D. R., Matross, D. M., Gilman, J. B., Kuster, W. C., Welsh-Bon, D., Warneke, C., de Gouw, J. A., Cahill, T. M., and Holzinger, R.: Methyl chavicol: characterization of its biogenic emission rate, abundance, and oxidation products in the atmosphere, Atmos. Chem. Phys., 9, 2061–2074, https://doi.org/10.5194/acp-9-2061-2009, 2009b. 3. Bouvier-Brown, N. C., Holzinger, R., Palitzsch, K., and Goldstein, A. H.: Large emissions of sesquiterpenes and methyl chavicol quantified from branch enclosure measurements, Atmos. Environ., 43, 389–401, https://doi.org/10.1016/j.atmosenv.2008.08.039, 2009c. 4. Brauers, T., Aschmutat, U., Brandenburger, U., Dorn, H., P, Hausmann, M., He{ß}ling, M., Hofzumahaus, A., Holland, F., Plass-Dülmer, C., and Ehhalt, D. H.: Intercomparison of tropospheric OH radical measurements by multiple folded long path laser absorption and laser induced fluorescence, Geophys. Res. Lett., 23, 2545–2548, https://doi.org/10.1029/96gl02204, 1996. 5. Butler, T. M., Taraborrelli, D., Fischer, C. B. H., Harder, H., Martinez, M., Williams, J., Lawrence, M. G., and Lelieveld, J.: Improved simulation of isoprene oxidation chemistry with the ECHAM5/MESSy chemistry-climate model: lessons from the GABRIEL airborne field campaign, Atmos. Chem. Phys., 8, 4529–4546, https://doi.org/10.5194/acp-8-4529-2008, 2008.
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