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  Combined effects of surface conditions, boundary layer dynamics and chemistry on diurnal SOA evolution

Janssen, R., Vil̀-Guerau De Arellano, J., Ganzeveld, L., Kabat, P., Jimenez, J., Farmer, D., et al. (2012). Combined effects of surface conditions, boundary layer dynamics and chemistry on diurnal SOA evolution. Atmospheric Chemistry and Physics, 12, 6827-6848. doi:10.5194/acp-12-6827-2012.

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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-E62E-B Versions-Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-E632-0
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Janssen, R.H.H., Autor
Vil̀-Guerau De Arellano, J., Autor
Ganzeveld, L.N., Autor
Kabat, P., Autor
Jimenez, J.L., Autor
Farmer, D.K., Autor
Van Heerwaarden, C.C.1, Autor
Mammarella, I., Autor
Affiliations:
1Max Planck Research Group Turbulent Mixing Processes in the Earth System, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913573              

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 Zusammenfassung: We study the combined effects of land surface conditions, atmospheric boundary layer dynamics and chemistry on the diurnal evolution of biogenic secondary organic aerosol in the atmospheric boundary layer, using a model that contains the essentials of all these components. First, we evaluate the model for a case study in Hyytiälä, Finland, and find that it is able to satisfactorily reproduce the observed dynamics and gas-phase chemistry. We show that the exchange of organic aerosol between the free troposphere and the boundary layer (entrainment) must be taken into account in order to explain the observed diurnal cycle in organic aerosol (OA) concentration. An examination of the budgets of organic aerosol and terpene concentrations show that the former is dominated by entrainment, while the latter is mainly driven by emission and chemical transformation. We systematically investigate the role of the land surface, which governs both the surface energy balance partitioning and terpene emissions, and the large-scale atmospheric process of vertical subsidence. Entrainment is especially important for the dilution of organic aerosol concentrations under conditions of dry soils and low terpene emissions. Subsidence suppresses boundary layer growth while enhancing entrainment. Therefore, it influences the relationship between organic aerosol and terpene concentrations. Our findings indicate that the diurnal evolution of secondary organic aerosols (SOA) in the boundary layer is the result of coupled effects of the land surface, dynamics of the atmospheric boundary layer, chemistry, and free troposphere conditions. This has potentially some consequences for the design of both field campaigns and large-scale modeling studies. © 2012 Author(s).

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Sprache(n): eng - English
 Datum: 2012-082012-08
 Publikationsstatus: Erschienen
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.5194/acp-12-6827-2012
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Titel: Atmospheric Chemistry and Physics
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Katlenburg-Lindau, Germany : European Geosciences Union
Seiten: - Band / Heft: 12 Artikelnummer: - Start- / Endseite: 6827 - 6848 Identifikator: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016