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| Titel |
A study of dispersion in complex terrain under winter conditions using high-resolution mesoscale and Lagrangian particle models |
| VerfasserIn |
J. L. Palau, G. Pérez-Landa, J. Meliá, D. Segarra, M. M. Millán |
| 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 ; 6, no. 4 ; Nr. 6, no. 4 (2006-04-04), S.1105-1134 |
| Datensatznummer |
250003633
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| Publikation (Nr.) |
 copernicus.org/acp-6-1105-2006.pdf |
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| Zusammenfassung |
| A mesoscale model (MM5), a dispersive Langrangian particle model (FLEXPART),
and intensive meteorological and COrrelation SPECtrometer (COSPEC)
measurements from a field campaign are used to examine the advection and
turbulent diffusion patterns associated with interactions and forcings
between topography, synoptic atmospheric flows and thermally-driven
circulations. This study describes the atmospheric dispersion of emissions
from a power plant with a 343-m tall chimney, situated on very complex
terrain in the North-East of Spain, under winter conditions. During the
field campaign, the plume was transported with low transversal dispersion
and deformed essentially due to the effect of mechanical turbulence. The
main surface impacts appeared at long distances from the emission source
(more than 30 km). The results show that the coupled models (MM5 and
FLEXPART) are able to predict the plume integral advection from the power
plant on very complex terrain. Integral advection and turbulent dispersion
are derived from the dispersive Lagrangian model output for three
consecutive days so that a direct quantitative comparison has been made
between the temporal evolution of the predicted three-dimensional dispersive
conditions and the COSPEC measurements. Comparison between experimental and
simulated transversal dispersion shows an index of agreement between 80%
and 90%, within distance ranges from 6 to 33 km from the stack. Linked to
the orographic features, the simulated plume impacts on the ground more than
30 km away from the stack, because of the lee waves simulated by MM5. |
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