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| Titel |
Insights into hydroxyl measurements and atmospheric oxidation in a California forest |
| VerfasserIn |
J. Mao, X. Ren, L. Zhang, D. M. Duin, R. C. Cohen, J.-H. Park, A. H. Goldstein, F. Paulot, M. R. Beaver, J. D. Crounse, P. O. Wennberg, J. P. DiGangi, S. B. Henry, F. N. Keutsch, C. Park, G. W. Schade, G. M. Wolfe, J. A. Thornton, W. H. Brune |
| 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 ; 12, no. 17 ; Nr. 12, no. 17 (2012-09-07), S.8009-8020 |
| Datensatznummer |
250011431
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| Publikation (Nr.) |
 copernicus.org/acp-12-8009-2012.pdf |
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| Zusammenfassung |
| 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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