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| Titel |
Global 3-d weather models for the atmospheric correction of gravity time series |
| VerfasserIn |
Thomas Klügel, Hartmut Wziontek |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250133867
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| Publikation (Nr.) |
 EGU/EGU2016-14526.pdf |
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| Zusammenfassung |
| The use of 3-dimensional weather models allows for an effective reduction of atmospheric
effects in gravity time series. In the past the BKG service Atmacs (Atmospheric Attraction
Computation Service) provided 3-d atmospheric correction time series only for European
stations of the International Geodynamics and Earth Tide Service (IGETS, formerly Global
Geodynamics Project, GGP), which are based on the high resolution regional model
COSMO-EU of the German Weather Service (DWD).
The provision of 3-d density data from the global weather models GME (20 km
resolution) and most recently ICON (13 km resolution) by the DWD now allows the
computation of 3-d atmospheric correction time series for all IGETS stations worldwide. Due
to the triangular grid structure, a different procedure for mass elements close to the
computation point is necessary. By increasing the spatial resolution towards the computation
point by linear interpolation of the grid values, the use of a point mass approach became
possible with an approximation error below 0.3 nm/s2. This approach also allows to
consider horizontal density gradients and a tilted model surface of the innermost
cells.
By means of a variance reduction at different frequency bands a significant
improvement of the atmospheric correction can be demonstrated at many IGETS
stations.
The limited temporal resolution of recently 3 hours can be improved by the user by
including local air pressure records using a remove-restore technique. Atmospheric correction
time series are online available at http://atmacs.bkg.bund.de. |
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