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| Titel |
Observation and modeling of the evolution of Texas power plant plumes |
| VerfasserIn |
W. Zhou, D. S. Cohan, R. W. Pinder, J. A. Neuman, J. S. Holloway, J. Peischl, T. B. Ryerson, J. B. Nowak, F. Flocke, W. G. Zheng |
| 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. 1 ; Nr. 12, no. 1 (2012-01-09), S.455-468 |
| Datensatznummer |
250010445
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| Publikation (Nr.) |
 copernicus.org/acp-12-455-2012.pdf |
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| Zusammenfassung |
| During the second Texas Air Quality Study 2006 (TexAQS II), a full range of
pollutants was measured by aircraft in eastern Texas during successive
transects of power plant plumes (PPPs). A regional photochemical model is
applied to simulate the physical and chemical evolution of the plumes. The
observations reveal that SO2 and NOy were rapidly removed from
PPPs on a cloudy day but not on the cloud-free days, indicating efficient
aqueous processing of these compounds in clouds. The model reasonably
represents observed NOx oxidation and PAN formation in the plumes, but
fails to capture the rapid loss of SO2 (0.37 h−1) and
NOy (0.24 h−1) in some plumes on the cloudy day. Adjustments to the
cloud liquid water content (QC) and the default metal concentrations in the
cloud module could explain some of the SO2 loss. However, NOy in
the model was insensitive to QC. These findings highlight cloud processing
as a major challenge to atmospheric models. Model-based estimates of ozone
production efficiency (OPE) in PPPs are 20–50 % lower than
observation-based estimates for the cloudy day. |
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