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| Titel |
Assimilation of GPS radio occultation data at DWD |
| VerfasserIn |
H. Anlauf, D. Pingel, A. Rhodin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 6 ; Nr. 4, no. 6 (2011-06-17), S.1105-1113 |
| Datensatznummer |
250002011
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| Publikation (Nr.) |
 copernicus.org/amt-4-1105-2011.pdf |
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| Zusammenfassung |
| We describe the status of the assimilation of bending angles from GPS
radio occultations in the 3D-Var for DWD's operational global forecast
model GME ("Global Model for Europe").
Experiments show that the assimilation of GPSRO data leads to a
significant reduction of biases in the analyses of temperature, humidity
and wind in the upper troposphere and the stratosphere, as well as a
better r. m. s. fit in the comparison to radiosondes. The impact on
forecasts is most prominent in the data sparse Southern Hemisphere, but is
also quite notable in the Northern Hemisphere extra-tropics.
The positive results
found in the impact experiments lead to the implementation of the
assimilation of GPS radio occultations from GRACE-A, FORMOSAT-3/COSMIC
and GRAS/MetOp-A into the operational suite on 3 August 2010. We also
show some initial results from assimilation experiments using radio
occultation data from the German research satellite TerraSAR-X. |
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