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| Titel |
Global mass fixer algorithms for conservative tracer transport in the ECMWF model |
| VerfasserIn |
M. Diamantakis, J. Flemming |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2014-05-23), S.965-979 |
| Datensatznummer |
250115624
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| Publikation (Nr.) |
 copernicus.org/gmd-7-965-2014.pdf |
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| Zusammenfassung |
Various mass fixer algorithms (MFAs) have been implemented in the Integrated
Forecasting System (IFS) of the European Centre for Medium-Range Weather
Forecasts (ECMWF) to ensure mass conservation of atmospheric tracers within
the semi-Lagrangian (SL) advection scheme. Emphasis has been placed in
implementing schemes that despite being primarily global in nature adjust the
solution mostly in regions where the advected field has large gradients and
therefore interpolation (transport) error is assumed larger.
The MFAs have been tested in weather forecast, idealised and atmospheric
dispersion cases. Applying these fixers to specific humidity and cloud fields
did not change the accuracy of 10-day forecasts. In other words, global mass
tracer conservation is achieved without deteriorating the solution accuracy.
However, for longer forecast timescales or for forecasts in which correlated
species are transported, experiments suggest that MFAs may improve IFS
forecasts. |
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