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@ARTICLE{Elshorbany:20058,
author = {Elshorbany, Y.F. and Kleffmann, J. and Hofzumahaus, A. and
Kurtenbach, R. and Wiesen, P. and Brauers, T. and Bohn, B.
and Dorn, H.-P. and Fuchs, H. and Holland, F. and Rohrer, F.
and Tillmann, R. and Wegener, R. and Wahner, A. and Kanaya,
Y. and Yoshino, A. and Hishida, S. and Kajii, Y. and
Martinez, M. and Kubistin, D. and Harder, H. and Lelieveld,
J. and Elste, T. and Plass-Dülmer, C. and Stange, G. and
Berresheim, H. and Schurath, U.},
title = {{HO}x budgets during {HO}x{C}omp: {A} case study of {HO}x
chemistry under {NO}x-limited conditions},
journal = {Journal of geophysical research / Atmospheres},
volume = {117},
issn = {0022-1406},
address = {Washington, DC},
publisher = {Union},
reportid = {PreJuSER-20058},
pages = {1 - 16},
year = {2012},
note = {This work was supported by the EU FP-6 program EUROCHAMP
(Integration of European Simulation Chambers for
Investigating Atmospheric Processes, grant
RII3-CT-2004-505968) and ACCENT (Priority 1.1.6.3. Global
Change and Ecosystems, grant GOCECT-2004-505337). We thank
F. J. Johnen for assistance with the experiments.},
abstract = {Recent studies have shown that measured OH under
NOx-limited, high-isoprene conditions are many times higher
than modeled OH. In this study, a detailed analysis of the
HOx radical budgets under low-NOx, rural conditions was
performed employing a box model based on the Master Chemical
Mechanism (MCMv3.2). The model results were compared with
HOx radical measurements performed during the international
HOxComp campaign carried out in Julich, Germany, during
summer 2005. Two different air masses influenced the
measurement site denoted as high-NOx (NO, 1-3 ppbv) and
low-NOx (NO, < 1 ppbv) periods. Both modeled OH and HO2
diurnal profiles lay within the measurement range of all HOx
measurement techniques, with correlation slopes between
measured and modeled OH and HO2 around unity. Recently
discovered interference in HO2 measurements caused by RO2
cross sensitivity was found to cause a $30\%$ increase in
measured HO2 during daytime on average. After correction of
the measured HO2 data, the model HO2 is still in good
agreement with the observations at high NOx but overpredicts
HO2 by a factor of 1.3 to 1.8 at low NOx. In addition, for
two different set of measurements, a missing OH source of
3.6 +/- 1.6 and 4.9 +/- 2.2 ppb h(-1) was estimated from the
experimental OH budget during the low-NOx period using the
corrected HO2 data. The measured diurnal profile of the
HO2/OH ratio, calculated using the corrected HO2, is well
reproduced by the MCM at high NOx but is significantly
overestimated at low NOx. Thus, the cycling between OH and
HO2 is better described by the model at high NOx than at low
NOx. Therefore, similar comprehensive field measurements
accompanied by model studies are urgently needed to
investigate HOx recycling under low-NOx conditions.},
keywords = {J (WoSType)},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {Atmosphäre und Klima},
pid = {G:(DE-Juel1)FUEK491},
shelfmark = {Meteorology $\&$ Atmospheric Sciences},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000300231600001},
doi = {10.1029/2011JD017008},
url = {https://juser.fz-juelich.de/record/20058},
}