| Titel:
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Seasonal Gravity Field Variations from GRACE and Hydrological Models |
| Type:
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Article in proceedingsArticle in proceedings |
| Person(er):
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Technical University of Denmark
Email:
Forfatter:
Hinderer, Jacques
Institut de Physique du Globe de Strasbourg
Forfatter:
Lemoine, Frank G.
NASA GSFC, Space Geodesy
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| Uddrag:
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This study present an investigation of the newly released 18 monthly gravity field solutions from the GRACE twin space-crafts with emphasis on the global scale annual gravity field variations observed from GRACE and modeled from hydrological models as annual changes in terrestrial water storage. Four global hydrological models covering the same period in 2002–2003 as the GRACE observations were investigated to for their mutual consistency in estimates of annual variation in terrestrial water storage and related temporal changes in gravity field. The hydrological models differ by a maximum of 2 µGal or nearly 5 cm equivalent water storage in selected regions. Integrated over all land masses the standard deviation among the annual signal from the four hydrological models are 0.6 µGal equivalent to around 1.4 cm in equivalent water layer thickness. The estimated accuracy of the annual variation in gravity from GRACE is around 0.4 µGal (0.9 cm water layer thickness) on 2000 km length scales. This makes the GRACE observations of terrestrial water storage on global annual scales more accurate than present-day hydrological models. |
| Publiceret:
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part of: Gravity, Geoid and Space Missions (ISBN: 978-3-540-26930-4), pages: 316-321, 2005, Springer Verlag, Heidelberg |
| DOI:
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| Præsenteret ved:
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International Association of Geodesy Symposia : Gravity, Geoid and Space Missions, Porto, Portugal August 30 – September 3, 2004 |
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