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| Titel |
HOx measurements in the summertime upper troposphere over Europe: a comparison of observations to a box model and a 3-D model |
| VerfasserIn |
E. Regelin, H. Harder, M. Martinez, D. Kubistin, C. Tatum Ernest, H. Bozem, T. Klippel, Z. Hosaynali-Beygi, H. Fischer, R. Sander, P. Jöckel, R. Königstedt, J. Lelieveld  |
| 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. 21 ; Nr. 13, no. 21 (2013-11-04), S.10703-10720 |
| Datensatznummer |
250085788
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| Publikation (Nr.) |
 copernicus.org/acp-13-10703-2013.pdf |
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| Zusammenfassung |
| In situ airborne measurements of OH and HO2 with the HORUS (HydrOxyl
Radical measurement Unit based on fluorescence Spectroscopy) instrument were
performed in the summertime upper troposphere across Europe during the HOOVER
2 (HOx OVer EuRope) campaign in July 2007. Complementary
measurements of trace gas species and photolysis frequencies were conducted
to obtain a broad data set, which has been used to quantify the significant
HOx sources and sinks. In this study we compare the in situ
measurement of OH and HO2 with simulated mixing ratios from the
constrained box model CAABA/MECCA (Chemistry As A Box Model
Application/Module Efficiently Calculating the Chemistry of the Atmosphere),
and the global circulation model EMAC (ECHAM5/MESSy Atmospheric Chemistry
Model). The constrained box model reproduces the observed OH and HO2
mixing ratios with better agreement (obs/mod median 98% OH, 96%
HO2) than the global model (median 76% OH, 59% HO2). The
observations and the computed HOx sources and sinks are used to
identify deviations between the models and their impacts on the calculated
HOx budget. |
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