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  HOx measurements in the summertime upper troposphere over Europe: a comparison of observations to a box model and a 3-D model

Regelin, E., Harder, H., Martinez, M., Kubistin, D., Ernest, C. T., Bozem, H., et al. (2013). HOx measurements in the summertime upper troposphere over Europe: a comparison of observations to a box model and a 3-D model. Atmospheric Chemistry and Physics, 13(21), 10703-10720.

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 Creators:
Regelin, E.1, Author              
Harder, H.1, Author              
Martinez, M.1, Author              
Kubistin, D.1, Author              
Ernest, C. T., Author
Bozem, H.1, Author              
Klippel, T.1, Author              
Hosaynali-Beygi, Z., Author
Fischer, H.1, Author              
Sander, R.1, Author              
Jöckel, P.1, Author              
Königstedt, R.1, Author              
Lelieveld, J.1, Author              
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: 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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Language(s): eng - English
 Dates: 2013
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 675638
ISI: 000327101900010
 Degree: -

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Title: Atmospheric Chemistry and Physics
Source Genre: Journal
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Pages: - Volume / Issue: 13 (21) Sequence Number: - Start / End Page: 10703 - 10720 Identifier: ISSN: 1680-7316