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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Case study of the diurnal variability of chemically active species with respect to boundary layer dynamics during DOMINO
Atmospheric Chemistry and Physics, Volume 12, No. 12, Year 2012
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Description
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 O 3-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. © 2012 Author(s).
Authors & Co-Authors
Van Stratum, B. J.H.
Unknown Affiliation
De Arellano, Jordi Vilà Guerau
Unknown Affiliation
Ouwersloot, H. G.
Unknown Affiliation
Van Den Dries, K.
Unknown Affiliation
Van Laar, T. W.
Unknown Affiliation
Martinéz, Monica
Unknown Affiliation
Lelieveld, Jos
Unknown Affiliation
Diesch, J. M.
Unknown Affiliation
Drewnick, F.
Unknown Affiliation
Fischer, Horst
Unknown Affiliation
Hosaynali Beygi, Z.
Unknown Affiliation
Harder, Hartwig D.
Unknown Affiliation
Regelin, E.
Unknown Affiliation
Sinha, V.
Unknown Affiliation
Adame Carnero, José Antonio
Unknown Affiliation
Sörgel, M.
Unknown Affiliation
Sander, Rolf
Unknown Affiliation
Bozem, Heiko
Unknown Affiliation
Song, W.
Unknown Affiliation
Williams, Jonathan D.
Unknown Affiliation
Yassaa, Noureddine
Unknown Affiliation
Statistics
Citations: 33
Authors: 21
Affiliations: 7
Identifiers
Doi:
10.5194/acp-12-5329-2012
ISSN:
16807316
e-ISSN:
16807324
Research Areas
Environmental
Study Design
Case Study
Study Approach
Qualitative