Standard deviations of noise (thick bars) and signals (thin bars) for mass, velocity, and total OAM. ECCOv4 (red), ECCO-JPL (black) and GFZ (blue); Χ1, Χ2, and Χ3 from top to bottom.
Standard deviations of noise (thick bars) and signals (thin bars) for mass, velocity, and total OAM. ECCOv4 (red), ECCO-JPL (black) and GFZ (blue); Χ1, Χ2, and Χ3 from top to bottom.
[30-Oct-2018] The ocean is a key factor in determining and understanding the geodetic properties of the Earth. For example, changes in the oceanic mass field can have important effects on crustal loading. Knowledge of the mean ocean surface circulation and dynamic topography can help determine the marine geoid and the gravity field. And variability in both ocean currents and bottom pressure can affect the Earth’s orientation in space.
The ECCO products make it possible to calculate geodetically relevant quantities such as the ocean angular momentum and center of mass, based on fields that are constrained to many data sets, most recently including GRACE-derived bottom pressure fields. Such time series, available at the Special Bureau for the Oceans/International Earth Rotation and Reference Systems Service (https://euler.jpl.nasa.gov/sbo/sbo_home.html), can be used to explore the role of the ocean in the excitation of Earth rotation changes.
The global coverage, continuity in time, and consistency with observations of the ECCO fields make them ideal for geodetic investigations of the role of the ocean on the Earth's variable shape, rotation and gravity field.
References
Quinn, K.J., Ponte, R.M, Heimbach, P., Fukumori, I., and Campin, J.-M., (2018)
Ocean Angular Momentum from a Recent Global State Estimate, with Assessment of Uncertainties, Geophys. J. Int., 216(1), 584-597, doi: 10.1093/gji/ggy452.2018-10-30
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