Hydrological Excitation of Polar Motion Derived from GRACE Gravity Field Solutions
The influence of the continental water storage on the polar motion is not well known. Different models have been developed to evaluate these effects and compared to geodetic observations. However, previous studies have shown large discrepancies mainly attributed to the lack of global measurements of...
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2011/174396 |
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| author | L. Seoane J. Nastula C. Bizouard D. Gambis |
| author_facet | L. Seoane J. Nastula C. Bizouard D. Gambis |
| author_sort | L. Seoane |
| collection | DOAJ |
| description | The influence of the continental water storage on the polar motion is not well known. Different models have been developed to evaluate these effects and compared to geodetic observations. However, previous studies have shown large discrepancies mainly attributed to the lack of global measurements of related hydrological parameters. Now, from the observations of the GRACE mission, we can estimate the polar motion excitation due to the global hydrology. Data processing of GRACE data is carried out by several centers of analysis, we focus on the new solution computed by the Groupe de Recherche de Géodésie Spatiale. At annual scales, excitations derived from GRACE data are in better agreement with geodetic observations than models estimates. The main contribution to the hydrological excitation comes from the monsoon climates regions where GRACE and models estimates are in a very good agreement. Still, the effect of the north high latitudes regions, where the principal areas of snow cover are found, cannot be neglected. At these regions, GRACE and models estimated contributions to polar motion excitations show significant discrepancies. Finally, GRACE-based excitations reveal the possible influence of water storage variations in exciting polar motion around the frequency of 3 cycles per year. |
| format | Article |
| id | doaj-art-5a684592834f4664be7b9987979c2011 |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-5a684592834f4664be7b9987979c20112025-02-03T06:07:27ZengWileyInternational Journal of Geophysics1687-885X1687-88682011-01-01201110.1155/2011/174396174396Hydrological Excitation of Polar Motion Derived from GRACE Gravity Field SolutionsL. Seoane0J. Nastula1C. Bizouard2D. Gambis3CNRS/UMR8630, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, FranceSpace Research Center, Polish Academy of Sciences, Bartycka 18 A, 00-716 Warsaw, PolandCNRS/UMR8630, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, FranceCNRS/UMR8630, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, FranceThe influence of the continental water storage on the polar motion is not well known. Different models have been developed to evaluate these effects and compared to geodetic observations. However, previous studies have shown large discrepancies mainly attributed to the lack of global measurements of related hydrological parameters. Now, from the observations of the GRACE mission, we can estimate the polar motion excitation due to the global hydrology. Data processing of GRACE data is carried out by several centers of analysis, we focus on the new solution computed by the Groupe de Recherche de Géodésie Spatiale. At annual scales, excitations derived from GRACE data are in better agreement with geodetic observations than models estimates. The main contribution to the hydrological excitation comes from the monsoon climates regions where GRACE and models estimates are in a very good agreement. Still, the effect of the north high latitudes regions, where the principal areas of snow cover are found, cannot be neglected. At these regions, GRACE and models estimated contributions to polar motion excitations show significant discrepancies. Finally, GRACE-based excitations reveal the possible influence of water storage variations in exciting polar motion around the frequency of 3 cycles per year.http://dx.doi.org/10.1155/2011/174396 |
| spellingShingle | L. Seoane J. Nastula C. Bizouard D. Gambis Hydrological Excitation of Polar Motion Derived from GRACE Gravity Field Solutions International Journal of Geophysics |
| title | Hydrological Excitation of Polar Motion Derived from GRACE Gravity Field Solutions |
| title_full | Hydrological Excitation of Polar Motion Derived from GRACE Gravity Field Solutions |
| title_fullStr | Hydrological Excitation of Polar Motion Derived from GRACE Gravity Field Solutions |
| title_full_unstemmed | Hydrological Excitation of Polar Motion Derived from GRACE Gravity Field Solutions |
| title_short | Hydrological Excitation of Polar Motion Derived from GRACE Gravity Field Solutions |
| title_sort | hydrological excitation of polar motion derived from grace gravity field solutions |
| url | http://dx.doi.org/10.1155/2011/174396 |
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