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| Titel |
Development of the GEOS-5 atmospheric general circulation model: evolution from MERRA to MERRA2 |
| VerfasserIn |
A. Molod, L. Takacs, M. Suarez, J. Bacmeister |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2015-05-12), S.1339-1356 |
| Datensatznummer |
250116338
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| Publikation (Nr.) |
 copernicus.org/gmd-8-1339-2015.pdf |
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| Zusammenfassung |
The Modern-Era Retrospective Analysis for Research and Applications-2
(MERRA2) version of the Goddard Earth Observing System-5 (GEOS-5) atmospheric
general circulation model (AGCM) is currently in use in the NASA Global
Modeling and Assimilation Office (GMAO) at a wide range of resolutions for a
variety of applications. Details of the changes in parameterizations
subsequent to the version in the original MERRA reanalysis are presented
here. Results of a series of atmosphere-only sensitivity studies are shown to
demonstrate changes in simulated climate associated with specific changes in
physical parameterizations, and the impact of the newly implemented
resolution-aware behavior on simulations at different resolutions is
demonstrated. The GEOS-5 AGCM presented here is the model used as part of the
GMAO MERRA2 reanalysis, global mesoscale simulations at 10 km resolution
through 1.5 km resolution, the real-time numerical weather prediction
system, and for atmosphere-only, coupled ocean-atmosphere and coupled
atmosphere-chemistry simulations.
The seasonal mean climate of the MERRA2 version of the GEOS-5 AGCM represents
a substantial improvement over the simulated climate of the MERRA version at
all resolutions and for all applications. Fundamental improvements in
simulated climate are associated with the increased re-evaporation of frozen
precipitation and cloud condensate, resulting in a wetter atmosphere.
Improvements in simulated climate are also shown to be attributable to
changes in the background gravity wave drag, and to upgrades in the
relationship between the ocean surface stress and the ocean roughness. The
series of resolution-aware parameters related to the moist physics
was shown to result in improvements
at higher resolutions and result in AGCM simulations that exhibit seamless
behavior across different resolutions and applications. |
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