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| Titel |
Quantifying atmospheric transport, chemistry, and mixing using a new trajectory-box model and a global atmospheric-chemistry GCM |
| VerfasserIn |
H. Riede, P. Jöckel, R. Sander |
| 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 (2009-12-15), S.267-280 |
| Datensatznummer |
250000550
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| Publikation (Nr.) |
 copernicus.org/gmd-2-267-2009.pdf |
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| Zusammenfassung |
We present a novel method for the quantification of transport, chemistry, and
mixing along atmospheric trajectories based on a consistent model hierarchy.
The hierarchy consists of the new atmospheric-chemistry trajectory-box model
CAABA/MJT and the three-dimensional (3-D) global ECHAM/MESSy
atmospheric-chemistry (EMAC) general circulation model. CAABA/MJT employs the
atmospheric box model CAABA in a configuration using the
atmospheric-chemistry submodel MECCA (M), the photochemistry submodel JVAL
(J), and the new trajectory submodel TRAJECT (T), to simulate chemistry along
atmospheric trajectories, which are provided offline. With the same
chemistry submodels coupled to the 3-D EMAC model and consistent
initial conditions and physical parameters, a unique consistency between the
two models is achieved. Since only mixing processes within the 3-D
model are excluded from the model consistency, comparisons of results from
the two models allow to separate and quantify contributions of transport,
chemistry, and mixing along the trajectory pathways. Consistency of transport
between the trajectory-box model CAABA/MJT and the 3-D EMAC model is
achieved via calculation of kinematic trajectories based on 3-D wind
fields from EMAC using the trajectory model LAGRANTO. The combination of the
trajectory-box model CAABA/MJT and the trajectory model LAGRANTO can be
considered as a Lagrangian chemistry-transport model (CTM) moving isolated
air parcels. The procedure for obtaining the necessary statistical basis for
the quantification method is described as well as the comprehensive
diagnostics with respect to chemistry.
The quantification method presented here allows to investigate the
characteristics of transport, chemistry, and mixing in a grid-based
3-D model. The analysis of chemical processes within the
trajectory-box model CAABA/MJT is easily extendable to include, for
example, the impact of different transport pathways or of mixing
processes onto chemistry. Under certain prerequisites described here, the
results can be used to complement observations with detailed information
about the history of observed air masses. |
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