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| Titel |
The Lagrangian chemistry and transport model ATLAS: validation of advective transport and mixing |
| VerfasserIn |
I. Wohltmann, M. Rex |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 2, no. 2 ; Nr. 2, no. 2 (2009-11-02), S.153-173 |
| Datensatznummer |
250000544
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| Publikation (Nr.) |
 copernicus.org/gmd-2-153-2009.pdf |
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| Zusammenfassung |
| We present a new global Chemical Transport Model (CTM) with full
stratospheric chemistry and Lagrangian transport and mixing called ATLAS
(Alfred Wegener InsTitute LAgrangian Chemistry/Transport System). Lagrangian
(trajectory-based) models have several important advantages over conventional
Eulerian (grid-based) models, including the absence of spurious numerical
diffusion, efficient code parallelization and no limitation of the largest
time step by the Courant-Friedrichs-Lewy criterion. The basic concept of
transport and mixing is similar to the approach in the commonly used CLaMS
model. Several aspects of the model are different from CLaMS and are
introduced and validated here, including a different mixing algorithm for
lower resolutions which is less diffusive and agrees better with observations
with the same mixing parameters. In addition, values for the vertical and
horizontal stratospheric bulk diffusion coefficients are inferred and
compared to other studies. This work focusses on the description of the
dynamical part of the model and the validation of the mixing algorithm. The
chemistry module, which contains 49 species, 170 reactions and a detailed
treatment of heterogeneous chemistry, will be presented in a separate paper. |
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