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| Titel |
The two-way nested global chemistry-transport zoom model TM5: algorithm and applications |
| VerfasserIn |
M. Krol, S. Houweling, B. Bregman, M. Broek, A. Segers, P. Velthoven, W. Peters, F. Dentener, P. Bergamaschi |
| 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 ; 5, no. 2 ; Nr. 5, no. 2 (2005-02-10), S.417-432 |
| Datensatznummer |
250002352
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| Publikation (Nr.) |
 copernicus.org/acp-5-417-2005.pdf |
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| Zusammenfassung |
| This paper describes the global chemistry Transport Model, version 5 (TM5) which allows two-way nested zooming.
The model is used for global studies which require high resolution regionally but can work on a coarser resolution
globally.
The zoom algorithm introduces refinement in both space and time in some predefined regions. Boundary conditions of the
zoom region are provided by a coarser parent grid and the results of the zoom area are communicated back to the parent.
A case study using 222Rn measurements that were taken during the MINOS campaign reveals the advantages of
local zooming.
As a next step, it is investigated to what extent simulated concentrations over Europe
are influenced by using an additional zoom domain over North America.
An artificial ozone-like tracer is introduced with a lifetime of twenty days and simplified non-linear chemistry.
The concentration differences at Mace Head (Ireland) are generally smaller than 10%, much smaller than the
effects of the resolution enhancement over Europe. Thus, coarsening of resolution at some distance of a sampling station seems
allowed. However, it is also noted that the budgets
of the tracers change considerably due to resolution dependencies of, for instance, vertical transport.
Due to the two-way nested algorithm, TM5 offers a consistent
tool to study the effects of grid refinement on global atmospheric chemistry issues
like intercontinental transport of air pollution. |
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