Residual ocean tide signals from satellite altimetry, GRACE gravity fields, and hydrodynamic modelling

Bösch, Wolfgang; Savcenko, R; Flechtner, Frank; Dahle, Christoph; Mayer‐Gürr, Torsten; Stammer, Detlef; Taguchi, E.; Ilk, Karl Heinz

doi:10.1111/j.1365-246x.2009.04281.x

Cited by 26 publications

(19 citation statements)

References 27 publications

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“…EOT11a [ Savcenko and Bosch , ] is the latest version of a series of global ocean tide models, derived at Deutsches Geodätisches Forschungsinstitut (DGFI) by means of empirical analysis of multimission satellite altimetry data. EOT11 is used for reprocessing of GRACE gravity data [ Bosch et al , ]; it is based on sea surface heights observed by Topex, Jason‐1, Jason‐2, ERS‐2, and Envisat over the ice‐free oceans covering altogether the period October 1992 to March 2010. Tidal constituents were estimated based on a residual least squares harmonic analysis with FES2004 taken as reference model.…”

Section: Summary Of Participating Tide Modelsmentioning

confidence: 99%

Accuracy assessment of global barotropic ocean tide models

et al. 2014

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The accuracy of state-of-the-art global barotropic tide models is assessed using bottom pressure data, coastal tide gauges, satellite altimetry, various geodetic data on Antarctic ice shelves, and independent tracked satellite orbit perturbations. Tide models under review include empirical, purely hydrodynamic ("forward"), and assimilative dynamical, i.e., constrained by observations. Ten dominant tidal constituents in the diurnal, semidiurnal, and quarter-diurnal bands are considered. Since the last major model comparison project in 1997, models have improved markedly, especially in shallow-water regions and also in the deep ocean. The root-sum-square differences between tide observations and the best models for eight major constituents are approximately 0.9, 5.0, and 6.5 cm for pelagic, shelf, and coastal conditions, respectively. Large intermodel discrepancies occur in high latitudes, but testing in those regions is impeded by the paucity of high-quality in situ tide records. Long-wavelength components of models tested by analyzing satellite laser ranging measurements suggest that several models are comparably accurate for use in precise orbit determination, but analyses of GRACE intersatellite ranging data show that all models are still imperfect on basin and subbasin scales, especially near Antarctica. For the M 2 constituent, errors in purely hydrodynamic models are now almost comparable to the 1980-era Schwiderski empirical solution, indicating marked advancement in dynamical modeling. Assessing model accuracy using tidal currents remains problematic owing to uncertainties in in situ current meter estimates and the inability to isolate the barotropic mode. Velocity tests against both acoustic tomography and current meters do confirm that assimilative models perform better than purely hydrodynamic models.

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Section: Summary Of Participating Tide Modelsmentioning

confidence: 99%

Accuracy assessment of global barotropic ocean tide models

et al. 2014

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“…Data constraints were provided on a global grid using the EOT11a [ Savcenko and Bosch , ; Bosch et al ., ]) which is a state of the art tide empirical model, comparable in quality with the GOT model [ Ray , ], although the accuracy over shelves is far from perfect in both data sets. Corrections for the ocean tides were made relative to the FES2004 model.…”

Section: Constrained Hamtide Tidal Solutionmentioning

confidence: 99%

Inferring deep ocean tidal energy dissipation from the global high‐resolution data‐assimilative HAMTIDE model

2014

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Energy dissipation rates of eight major semidiurnal and diurnal tidal constituents are inferred using a barotropic data assimilative tide model with 7.5' spatial resolution. Dynamical residuals and dynamical residual power, estimated through the assimilation procedure as a correction for model uncertainties, constitute an essential contribution to deep-ocean and shallow-seas dissipation rates. Resulting total dissipation rates amount to 3.54 TW, of which 2.44 TW (69%) are accounted for by the M 2 component alone. Concentrating on the deep ocean (> 1000 m water depth), the dissipation by all eight constituents amounts to 1.42 TW, and 0.93 TW just for the M 2 component. These results are higher by 19% and 38% than dissipation rates estimated by Egbert and Ray (2003), respectively. Of the globally dissipated 2:44TWM 2 energy, 1.24 TW are estimated to arise from bottom drag and eddy turbulence, 1.20 TW from residual power. For just the deep ocean, respective numbers amount to 0.10 TW for bottom drag and eddy turbulence, 1.07 TW for barotropic-to-baroclinic energy conversion due to the internal wave drag. Interpreting negative residual power 20.24 TW as a potential tidal energy source, a net surface-to-internal tide M 2 energy conversion would amount to 0.83 TW.

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“…Ocean tide models are usually used to provide corrections to GPS, altimeter or gravity data, which can later be adopted for further studies, such as ice mass balance or GIA. The prediction accuracy of ocean tide models is essential since the improvement of tidal corrections can effectively and correctly remove the tidal 'noise', so that the nontidal signals of interest can be studied more reliably (Bosch et al 2009). Since the launch of T/P satellite, much progress in improving global tide models has been achieved (Fu et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Accuracy Assessment of Recent Global Ocean Tide Models Around Antarctica

Lei

Zhang

Hao

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Due to the coverage limitation of T/P-series altimeters, the lack of bathymetric data under large ice shelves, and the inaccurate definitions of coastlines and grounding lines, the accuracy of ocean tide models around Antarctica is poorer than those in deep oceans. Using tidal measurements from tide gauges, gravimetric data and GPS records, the accuracy of seven state-of-the-art global ocean tide models (DTU10、EOT11a、GOT4.8、FES2012、FES2014、HAMTIDE12、TPXO8) is assessed, as well as the most widely-used conventional model FES2004. Four regions (Antarctic Peninsula region, Amery ice shelf region, Filchner-Ronne ice shelf region and Ross ice shelf region) are separately reported. The standard deviations of eight main constituents between the selected models are large in polar regions, especially under the big ice shelves, suggesting that the uncertainty in these regions remain large. Comparisons with in situ tidal measurements show that the most accurate model is TPXO8, and all models show worst performance in Weddell sea and Filchner-Ronne ice shelf regions. The accuracy of tidal predictions around Antarctica is gradually improving.

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Residual ocean tide signals from satellite altimetry, GRACE gravity fields, and hydrodynamic modelling

Cited by 26 publications

References 27 publications

Accuracy assessment of global barotropic ocean tide models

Accuracy assessment of global barotropic ocean tide models

Inferring deep ocean tidal energy dissipation from the global high‐resolution data‐assimilative HAMTIDE model

Accuracy Assessment of Recent Global Ocean Tide Models Around Antarctica

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