Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion Excitation
In this study, we calculate the hydrological plus cryospheric excitation of polar motion (hydrological plus cryospheric angular momentum, HAM/CAM) using mascon solutions based on observations from the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) missions. We compare...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/13/6/1152 |
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| author | Justyna Śliwińska Małgorzata Wińska Jolanta Nastula |
| author_facet | Justyna Śliwińska Małgorzata Wińska Jolanta Nastula |
| author_sort | Justyna Śliwińska |
| collection | DOAJ |
| description | In this study, we calculate the hydrological plus cryospheric excitation of polar motion (hydrological plus cryospheric angular momentum, HAM/CAM) using mascon solutions based on observations from the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) missions. We compare and evaluate HAM/CAM computed from GRACE and GRACE-FO mascon data provided by the Jet Propulsion Laboratory (JPL), the Center for Space Research (CSR), and the Goddard Space Flight Center (GSFC). A comparison with HAM obtained from the Land Surface Discharge Model is also provided. An analysis of HAM/CAM and HAM is performed for overall variability, trends, and seasonal and non-seasonal variations. The HAM/CAM and HAM estimates are validated using the geodetic residual time series (GAO), which is an estimation of the hydrological plus cryospheric signal in geodetically observed polar motion excitation. In general, all mascon datasets are found to be equally suitable for the determination of overall, seasonal, and non-seasonal HAM/CAM oscillations, but some differences in trends remain. The use of an ellipsoidal correction, implemented in the newest solution from CSR, does not noticeably affect the consistency between HAM/CAM and GAO. Analysis of the data from the first two years of the GRACE-FO mission indicates that the current accuracy of HAM/CAM from GRACE-FO mascon data meets expectations, and the root mean square deviation of HAM/CAM components are between 5 and 6 milliarcseconds. The findings from this study can be helpful in assessing the role of satellite gravimetry in polar motion studies and may contribute towards future improvements to GRACE-FO data processing. |
| first_indexed | 2024-03-10T13:09:03Z |
| format | Article |
| id | doaj.art-d33c2b53ad554e09bff332486a6f0a62 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T13:09:03Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-d33c2b53ad554e09bff332486a6f0a622023-11-21T10:56:17ZengMDPI AGRemote Sensing2072-42922021-03-01136115210.3390/rs13061152Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion ExcitationJustyna Śliwińska0Małgorzata Wińska1Jolanta Nastula2Space Research Centre, Polish Academy of Sciences, 00-716 Warsaw, PolandFaculty of Civil Engineering, Warsaw University of Technology, 00-637 Warsaw, PolandSpace Research Centre, Polish Academy of Sciences, 00-716 Warsaw, PolandIn this study, we calculate the hydrological plus cryospheric excitation of polar motion (hydrological plus cryospheric angular momentum, HAM/CAM) using mascon solutions based on observations from the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) missions. We compare and evaluate HAM/CAM computed from GRACE and GRACE-FO mascon data provided by the Jet Propulsion Laboratory (JPL), the Center for Space Research (CSR), and the Goddard Space Flight Center (GSFC). A comparison with HAM obtained from the Land Surface Discharge Model is also provided. An analysis of HAM/CAM and HAM is performed for overall variability, trends, and seasonal and non-seasonal variations. The HAM/CAM and HAM estimates are validated using the geodetic residual time series (GAO), which is an estimation of the hydrological plus cryospheric signal in geodetically observed polar motion excitation. In general, all mascon datasets are found to be equally suitable for the determination of overall, seasonal, and non-seasonal HAM/CAM oscillations, but some differences in trends remain. The use of an ellipsoidal correction, implemented in the newest solution from CSR, does not noticeably affect the consistency between HAM/CAM and GAO. Analysis of the data from the first two years of the GRACE-FO mission indicates that the current accuracy of HAM/CAM from GRACE-FO mascon data meets expectations, and the root mean square deviation of HAM/CAM components are between 5 and 6 milliarcseconds. The findings from this study can be helpful in assessing the role of satellite gravimetry in polar motion studies and may contribute towards future improvements to GRACE-FO data processing.https://www.mdpi.com/2072-4292/13/6/1152GRACEGRACE Follow-OnmasconEarth rotationpolar motion excitationhydrosphere |
| spellingShingle | Justyna Śliwińska Małgorzata Wińska Jolanta Nastula Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion Excitation Remote Sensing GRACE GRACE Follow-On mascon Earth rotation polar motion excitation hydrosphere |
| title | Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion Excitation |
| title_full | Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion Excitation |
| title_fullStr | Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion Excitation |
| title_full_unstemmed | Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion Excitation |
| title_short | Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion Excitation |
| title_sort | validation of grace and grace fo mascon data for the study of polar motion excitation |
| topic | GRACE GRACE Follow-On mascon Earth rotation polar motion excitation hydrosphere |
| url | https://www.mdpi.com/2072-4292/13/6/1152 |
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