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| Titel |
Case study of the diurnal variability of chemically active species with respect to boundary layer dynamics during DOMINO |
| VerfasserIn |
B. J. H. Stratum, J. Vilà-Guerau de Arellano, H. G. Ouwersloot, K. Dries, T. W. Laar, M. Martinez, J. Lelieveld  , J.-M. Diesch, F. Drewnick, H. Fischer, Z. Hosaynali Beygi, H. Harder, E. Regelin, V. Sinha, J. A. Adame, M. Sörgel, R. Sander, H. Bozem, W. Song, J. Williams, N. Yassaa |
| 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. 12 ; Nr. 12, no. 12 (2012-06-19), S.5329-5341 |
| Datensatznummer |
250011272
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| Publikation (Nr.) |
 copernicus.org/acp-12-5329-2012.pdf |
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| Zusammenfassung |
| We study the interactions between atmospheric boundary layer (ABL) dynamics
and atmospheric chemistry using a mixed-layer model
coupled to chemical reaction schemes. Guided by both atmospheric and chemical
measurements obtained during the DOMINO (Diel Oxidant Mechanisms in relation to Nitrogen Oxides)
campaign (2008), numerical experiments are performed to study the role of
ABL dynamics and the accuracy of chemical schemes with different complexity:
the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4) and a reduced
mechanism of this chemical system. Both schemes produce satisfactory results,
indicating that the reduced scheme is capable of reproducing the
O3-NOx-VOC-HOx diurnal cycle during conditions
characterized by a low NOx regime and small O3 tendencies (less
than 1 ppb per hour). By focusing on the budget equations of chemical
species in the mixed-layer model, we show that for species like O3, NO and
NO2, the influence of entrainment and boundary layer growth is of the same
order as chemical production/loss. This indicates that an accurate
representation of ABL processes is crucial in understanding the diel cycle
of chemical species. By comparing the time scales of chemical reactive
species with the mixing time scale of turbulence, we propose a classification
based on the Damköhler number to further determine the importance of
dynamics on chemistry during field campaigns. Our findings advocate an
integrated approach, simultaneously solving the ABL dynamics and chemical
reactions, in order to obtain a better understanding of chemical pathways and
processes and the interpretation of the results obtained during measurement
campaigns. |
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