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| Titel |
Characterization of a boreal convective boundary layer and its impact on atmospheric chemistry during HUMPPA-COPEC-2010 |
| VerfasserIn |
H. G. Ouwersloot, J. Vilà-Guerau de Arellano, A. C. Nölscher, M. C. Krol, L. N. Ganzeveld, C. Breitenberger, I. Mammarella, J. Williams, J. Lelieveld  |
| 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. 19 ; Nr. 12, no. 19 (2012-10-15), S.9335-9353 |
| Datensatznummer |
250011508
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| Publikation (Nr.) |
 copernicus.org/acp-12-9335-2012.pdf |
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| Zusammenfassung |
| We studied the atmospheric boundary layer (ABL) dynamics and the impact on
atmospheric chemistry during the HUMPPA-COPEC-2010 campaign. We used vertical
profiles of potential temperature and specific moisture, obtained from 132
radio soundings, to determine the main boundary layer characteristics during
the campaign. We propose a classification according to several main ABL
prototypes. Further, we performed a case study of a single day, focusing on
the convective boundary layer, to analyse the influence of the dynamics on
the chemical evolution of the ABL. We used a mixed layer model, initialized
and constrained by observations. In particular, we investigated the role of
large scale atmospheric dynamics (subsidence and advection) on the ABL
development and the evolution of chemical species concentrations. We find
that, if the large scale forcings are taken into account, the ABL dynamics
are represented satisfactorily. Subsequently, we studied the impact of mixing
with a residual layer aloft during the morning transition on atmospheric
chemistry. The time evolution of NOx and O3 concentrations,
including morning peaks, can be explained and accurately simulated by
incorporating the transition of the ABL dynamics from night to day. We
demonstrate the importance of the ABL height evolution for the representation
of atmospheric chemistry. Our findings underscore the need to couple the
dynamics and chemistry at different spatial scales (from turbulence to
mesoscale) in chemistry-transport models and in the interpretation of
observational data. |
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