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| Titel |
Coupling global chemistry transport models to ECMWF's integrated forecast system |
| VerfasserIn |
J. Flemming, A. Inness, H. Flentje, V. Huijnen, P. Moinat, M. G. Schultz, O. Stein |
| 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 (2009-12-08), S.253-265 |
| Datensatznummer |
250000549
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| Publikation (Nr.) |
 copernicus.org/gmd-2-253-2009.pdf |
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| Zusammenfassung |
| The implementation and application of a newly developed coupled system
combining ECMWF's integrated forecast system (IFS) with global chemical
transport models (CTMs) is presented. The main objective of the coupled
system is to enable the IFS to simulate key chemical species without the
necessity to invert the complex source and sink processes such as chemical
reactions, emission and deposition. Thus satellite observations of
atmospheric composition can be assimilated into the IFS using its 4D-VAR
algorithm. In the coupled system, the IFS simulates only the transport of
chemical species. The coupled CTM provides to the IFS the concentration
tendencies due to emission injection, deposition and chemical conversion. The
CTMs maintain their own transport schemes and are fed with meteorological
data at hourly resolution from the IFS. The CTM used in the coupled system
can be either MOZART-3, TM5 or MOCAGE. The coupling is achieved via the
special-purpose software OASIS4. The scientific integrity of the coupled
system is proven by analysing the difference between stand-alone CTM
simulations and the tracer fields in the coupled IFS. The IFS concentration
fields match the CTM fields for about 48 h with the biggest differences
occurring in the planetary boundary layer (PBL). The coupled system is a good
test bed for process-oriented comparison of the coupled CTM. As an example,
the vertical structure of chemical conversion and emission injection is
studied for a ten day period over Central Europe for the three CTMs. |
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