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| Titel |
OH and HO2 radical chemistry during PROPHET 2008 and CABINEX 2009 – Part 1: Measurements and model comparison |
| VerfasserIn |
S. M. Griffith, R. F. Hansen, S. Dusanter, P. S. Stevens, M. Alaghmand, S. B. Bertman, M. A. Carroll, M. Erickson, M. Galloway, N. Grossberg, J. Hottle, J. Hou, B. T. Jobson, A. Kammrath, F. N. Keutsch, B. L. Lefer, L. H. Mielke, A. O'Brien, P. B. Shepson, M. Thurlow, W. Wallace, N. Zhang, X. L. Zhou |
| 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 ; 13, no. 11 ; Nr. 13, no. 11 (2013-06-03), S.5403-5423 |
| Datensatznummer |
250018680
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| Publikation (Nr.) |
 copernicus.org/acp-13-5403-2013.pdf |
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| Zusammenfassung |
Hydroxyl (OH) and hydroperoxyl (HO2) radicals are key species driving
the oxidation of volatile organic compounds that can lead to the production
of ozone and secondary organic aerosols. Previous measurements of these
radicals in forest environments with high isoprene, low NOx conditions
have shown serious discrepancies with modeled concentrations, bringing into
question the current understanding of isoprene oxidation chemistry in these
environments.
During the summers of 2008 and 2009, OH and peroxy radical concentrations
were measured using a laser-induced fluorescence instrument as part of the
PROPHET (Program for Research on Oxidants: PHotochemistry, Emissions, and
Transport) and CABINEX (Community Atmosphere-Biosphere INteractions
EXperiment) campaigns at a forested site in northern Michigan. Supporting
measurements of photolysis rates, volatile organic compounds, NOx (NO
+ NO2 and other inorganic species were used to constrain a
zero-dimensional box model based on the Regional Atmospheric Chemistry
Mechanism, modified to include the Mainz Isoprene Mechanism (RACM-MIM). The
CABINEX model OH predictions were in good agreement with the measured OH
concentrations, with an observed-to-modeled ratio near one (0.70 ± 0.31)
for isoprene mixing ratios between 1–2 ppb on average. The measured
peroxy radical concentrations, reflecting the sum of HO2 and
isoprene-based peroxy radicals, were generally lower than predicted by the
box model in both years. |
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