Tide model comparison over the Southwestern Atlantic Shelf
Sea surface height (SSH) as measured by satellites has become a powerful tool for oceanographic and climate related studies. Whereas in the open ocean good accuracy has been achieved, more energetic dynamics and a number of calibration problems have limited applications over continental shelves and...
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todo:paper_02784343_v30_n17_p1865_Saraceno2023-10-03T15:17:00Z Tide model comparison over the Southwestern Atlantic Shelf Saraceno, M. D'Onofrio, E.E. Fiore, M.E. Grismeyer, W.H. Costal satellite altimetry Sea surface height Southwestern Atlantic continental shelf Tide modeling accuracy assessment calibration continental shelf geostrophic flow harmonic analysis in situ measurement mathematical analysis nonlinearity oceanography satellite altimetry satellite data satellite imagery sea surface height spatial resolution tidal modeling tide gauge Atlantic Ocean Atlantic Ocean (Southwest) Patagonian Shelf Sea surface height (SSH) as measured by satellites has become a powerful tool for oceanographic and climate related studies. Whereas in the open ocean good accuracy has been achieved, more energetic dynamics and a number of calibration problems have limited applications over continental shelves and near the coast. Tidal ranges in the Southwestern Atlantic (SWA) continental shelf are among the highest in the world ocean, reaching up to 12 m at specific locations. This fact highlights the relevance of the accuracy of the tidal correction that must be applied to the satellite data to be useful in the region. In this work, amplitudes and phases of tidal constituents are extracted from five global tide models and three regional models and compared to the corresponding harmonics estimated from coastal tide gauges (TGs) and satellite altimetry data. The Root Sum Square (RSS) of the misfit of the common set of the five tidal constituents solved by the models (M2, N2, S2, K1 and O1) is higher than 18 cm close to the coast for two of the regional models and higher than 24.5 cm for the rest of the models considered. Both values are too high to provide an accurate estimation of geostrophic non-tidal currents from satellite altimetry in the coastal region. On the other hand, the global model with the highest spatial resolution has a RSS lower than 4.5 cm over the continental shelf even when the non-linear M4 overtide is considered. Comparison with in-situ current measurements suggests that this model can be used to de-tide altimetry data to compute large-scale patterns of SSH and associated geostrophic velocities. It is suggested that a local tide model with very high resolution that assimilates in-situ and satellite data should meet the precision needed to estimate geostrophic velocities at a higher resolution both close to the coast and over the Patagonian shelf. © 2010 Elsevier Ltd. Fil:Saraceno, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02784343_v30_n17_p1865_Saraceno |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Costal satellite altimetry Sea surface height Southwestern Atlantic continental shelf Tide modeling accuracy assessment calibration continental shelf geostrophic flow harmonic analysis in situ measurement mathematical analysis nonlinearity oceanography satellite altimetry satellite data satellite imagery sea surface height spatial resolution tidal modeling tide gauge Atlantic Ocean Atlantic Ocean (Southwest) Patagonian Shelf |
| spellingShingle |
Costal satellite altimetry Sea surface height Southwestern Atlantic continental shelf Tide modeling accuracy assessment calibration continental shelf geostrophic flow harmonic analysis in situ measurement mathematical analysis nonlinearity oceanography satellite altimetry satellite data satellite imagery sea surface height spatial resolution tidal modeling tide gauge Atlantic Ocean Atlantic Ocean (Southwest) Patagonian Shelf Saraceno, M. D'Onofrio, E.E. Fiore, M.E. Grismeyer, W.H. Tide model comparison over the Southwestern Atlantic Shelf |
| topic_facet |
Costal satellite altimetry Sea surface height Southwestern Atlantic continental shelf Tide modeling accuracy assessment calibration continental shelf geostrophic flow harmonic analysis in situ measurement mathematical analysis nonlinearity oceanography satellite altimetry satellite data satellite imagery sea surface height spatial resolution tidal modeling tide gauge Atlantic Ocean Atlantic Ocean (Southwest) Patagonian Shelf |
| description |
Sea surface height (SSH) as measured by satellites has become a powerful tool for oceanographic and climate related studies. Whereas in the open ocean good accuracy has been achieved, more energetic dynamics and a number of calibration problems have limited applications over continental shelves and near the coast. Tidal ranges in the Southwestern Atlantic (SWA) continental shelf are among the highest in the world ocean, reaching up to 12 m at specific locations. This fact highlights the relevance of the accuracy of the tidal correction that must be applied to the satellite data to be useful in the region. In this work, amplitudes and phases of tidal constituents are extracted from five global tide models and three regional models and compared to the corresponding harmonics estimated from coastal tide gauges (TGs) and satellite altimetry data. The Root Sum Square (RSS) of the misfit of the common set of the five tidal constituents solved by the models (M2, N2, S2, K1 and O1) is higher than 18 cm close to the coast for two of the regional models and higher than 24.5 cm for the rest of the models considered. Both values are too high to provide an accurate estimation of geostrophic non-tidal currents from satellite altimetry in the coastal region. On the other hand, the global model with the highest spatial resolution has a RSS lower than 4.5 cm over the continental shelf even when the non-linear M4 overtide is considered. Comparison with in-situ current measurements suggests that this model can be used to de-tide altimetry data to compute large-scale patterns of SSH and associated geostrophic velocities. It is suggested that a local tide model with very high resolution that assimilates in-situ and satellite data should meet the precision needed to estimate geostrophic velocities at a higher resolution both close to the coast and over the Patagonian shelf. © 2010 Elsevier Ltd. |
| format |
JOUR |
| author |
Saraceno, M. D'Onofrio, E.E. Fiore, M.E. Grismeyer, W.H. |
| author_facet |
Saraceno, M. D'Onofrio, E.E. Fiore, M.E. Grismeyer, W.H. |
| author_sort |
Saraceno, M. |
| title |
Tide model comparison over the Southwestern Atlantic Shelf |
| title_short |
Tide model comparison over the Southwestern Atlantic Shelf |
| title_full |
Tide model comparison over the Southwestern Atlantic Shelf |
| title_fullStr |
Tide model comparison over the Southwestern Atlantic Shelf |
| title_full_unstemmed |
Tide model comparison over the Southwestern Atlantic Shelf |
| title_sort |
tide model comparison over the southwestern atlantic shelf |
| url |
http://hdl.handle.net/20.500.12110/paper_02784343_v30_n17_p1865_Saraceno |
| work_keys_str_mv |
AT saracenom tidemodelcomparisonoverthesouthwesternatlanticshelf AT donofrioee tidemodelcomparisonoverthesouthwesternatlanticshelf AT fioreme tidemodelcomparisonoverthesouthwesternatlanticshelf AT grismeyerwh tidemodelcomparisonoverthesouthwesternatlanticshelf |
| _version_ |
1807321544215494656 |