Empirical ocean tide modeling

[The amplitude (in cm) of the M2 ocean tidal constituent derived from the EOT20 tide model for the global ocean.]

The long time series of precise and nearly global altimeter measurements from missions with different sampling characteristics allow a comprehensive and very accurate empirical modeling of ocean tides. For many years, DGFI-TUM has been computing global empirical ocean tide models based on altimetry data, the latest being EOT20.

Precise knowledge of ocean tides is of great importance for high-precision geodetic applications, since the observational data of all geodetic space techniques must be corrected for the comparatively high-frequency tidal influences. Furthermore, accurate tidal models are also relevant for ship traffic and for estimating the hazard potential of storm surges in the context of climate change and coastal protection.

The accuracy and spatial resolution of ocean tide models is increased by incorporating additional new and improved data (more missions and improved data pre-processing such as coastal retracking of radar waveforms). The longer and more accurate time series allow estimation of tidal components with smaller amplitudes. Advanced evaluation methods for ice-covered areas of the ocean are leading to improvements in these regions. Careful validation of tidal models is performed using data from coastal tide gauges and shallow-water bottom pressure sensors as well as through statistical evaluation of cross-over differences at altimeter ground tracks.

Related project

Related data products

Selected Publications

Hart-Davis M.G., Piccioni G., Dettmering D., Schwatke C., Passaro M., Seitz F.: EOT20: a global ocean tide model from multi-mission satellite altimetry. Earth System Science Data, 13(8), 3869-3884, 10.5194/essd-13-3869-2021, 2021 (Open Access)
Piccioni G., Dettmering D., Schwatke C., Passaro M., Seitz F.: Design and regional assessment of an empirical tidal model based on FES2014 and coastal altimetry. Advances in Space Research, 68(2), 1013-1022, 10.1016/j.asr.2019.08.030, 2021
Piccioni G., Dettmering D., Passaro M., Schwatke C., Bosch W., Seitz F.: Coastal Improvements for Tide Models: The Impact of ALES Retracker. Remote Sensing, 10(5), 10.3390/rs10050700, 2018 (Open Access)
Stammer D., Ray R.D., Andersen O.B., Arbic B.K., Bosch W., Carrère L., Cheng Y., Chinn D.S., Dushaw B.D., Egbert G.D., Erofeeva S.Y., Fok H.S., Green J.A.M., Griffiths S., King M.A., Lapin V., Lemoine F.G., Luthcke S.B., Lyard F., Morison J., Müller M., Padman L., Richman J.G., Shriver J.F., Shum C.K., Taguchi E., Yi Y.: Accuracy assessment of global barotropic ocean tide models. Reviews of Geophysics 52(3): 243-282, 10.1002/2014RG000450, 2014
Savcenko R., Bosch W.: EOT11a - Empirical Ocean Tide Model From Multi-Mission Satellite Altimetry. DGFI Report No. 89, 2012

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