Temporal gravity changes over nine years as observed by the Swarm satellites
| Autor: | Encarnação, J., Arnold, D., Bezdek, A., Dahle, C., Guo, J., van den Ijssel, J., Jäggi, A., Klokocnik, J., Krauss, S., Mayer-Gürr, T., Meyer, U., Sebera, J., Shum, C., Pieter, V., Yu, Z. |
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| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-3225 |
| Popis: | The Swarm satellites, designed for observing Earth's magnetic field, also gather GPS data with enough precision to study Earth's time-varying gravity field with a resolution of approximately 1500 km. The models, which span from 2014 to the present and don't require any additional gravimetric data or prior information, are updated monthly. These data fill in the gaps between the GRACE and GRACE-FO missions, as well as any other short interruptions in their series. After more than 9 years of successful operation, the Swarm satellites are still in good health. The planned future mission profile allows for many more years of operation, such that Swarm helps to guarantee continuous observation of Earth’s time variable gravity field.A consortium of international research institutes supported by theEuropean Space Agency and the International Combination Service for Time-variable Gravity Fields (COST-G), publishes the gravity field models every 3 months at the Swarm Data Access server(https://swarm-diss.eo.esa.int)and the International Centre for Global Earth Models(http://icgem.gfz-potsdam.de/series/02_COST-G/Swarm). These models are based on “individual” gravity field models estimated by each institute using different gravity inversion strategies, which are combined using Variance Component Estimation to produce the published models.We showcase the geophysical signals represented in our models across large hydrological basins, compare them with GRACE and GRACE-FO results and the discrepancies over deep oceans areas. Our analysis encompasses the time frame of the GRACE/GRACE-FO gap and highlights the significant importance of the Swarm satellites in bridging the gap caused by the absence of low-low satellite-to-satellite tracking data. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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