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| Titel |
Modelling tracer transport by a cumulus ensemble: lateral boundary conditions and large-scale ascent |
| VerfasserIn |
M. Salzmann, M. G. Lawrence, V. T. J. Phillips, L. J. Donner |
| 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 ; 4, no. 7 ; Nr. 4, no. 7 (2004-09-13), S.1797-1811 |
| Datensatznummer |
250002029
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| Publikation (Nr.) |
 copernicus.org/acp-4-1797-2004.pdf |
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| Zusammenfassung |
| The vertical transport of tracers by a cumulus ensemble at the TOGA-COARE
site is modelled during a 7 day episode using 2-D and 3-D cloud-resolving
setups of the Weather Research and Forecast (WRF) model. Lateral boundary
conditions (LBC) for tracers, water vapour, and wind are specified and the
horizontal advection of trace gases across the lateral domain boundaries is
considered.
Furthermore, the vertical advection of
trace gases by the large-scale motion (short: vertical large-scale advection
of tracers, VLSAT) is considered. It is shown that including VLSAT partially
compensates the calculated net downward transport from the middle and upper
troposphere (UT) due to the mass balancing mesoscale subsidence induced by
deep convection. Depending on whether the VLSAT term is added or not,
modelled domain averaged vertical tracer profiles can differ significantly.
Differences between a 2-D and a 3-D model run were
mainly attributed to an increase in horizontal advection across the lateral
domain boundaries due to the meridional wind component not considered in the
2-D setup. |
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