Geodetic residuals GAHS = GAM-(AAM+HAM+SLAM) are constructed by calculating the geodetically observed angular momentum (GAM) from the deconvolution of IERS 20C04 EOPs into the effective angular momentum and subtracting model-based contributions of atmosphere (AAM), terrestrial hydrology (HAM), and accounting for the global mass balance with the apropriate combination-dependent barystatic sea level budget (SLAM). Under the assumption that the sum of model-based AAM, OAM, HAM, and SLAM can be compared to GAM, GAHS provides an estimate of ocean angular momentum independend of ocean models.

Please reference the GAHS datasets with:

• Stumpe et al. (2027), Closing Mass-Consistent Earth Angular Momentum Budgets: The Role and Uncertainty of Oceanic Excitation. Journal of Geodesy.

All available geodetic residuals GAHS can be downloaded here.

Auxiliary AAM produced for GAHS can be downloaded here.

Auxiliary HAM produced for GAHS can be downloaded here.

Auxiliary SLAM produced for GAHS can be downloaded here.

*SLE: Sea level equation representing the barystatic response of the global ocean required to conserve the total mass of the related surface fluid systems atmosphere (AAM) and terrestrial hydrology (HAM) under consideration of loading and self-attraction, see:

• Dobslaw et al. (2010), Seasonal polar motion excitation from numerical models of atmosphere, ocean, and continental hydrosphere. Journal of Geophysical Research: Solid Earth, 115:10406.
• Dill and Dobslaw (2019), Seasonal variations in global mean sea level and consequences on the excitation of length-of-day changes. Geophysical Journal International, 218:801–816.

*OBP-barslv: Pressure variations due to mass inflow from the continents and deformations of the equipotential surface coincident with mean sea-level due to gravitational attraction of masses at the continents, see GravIS OBP technical note.

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