Latest improvements in the assessment of the global ocean heat content and 
Earth energy imbalance from space gravimetry and altimetry

Marti, Florence; Blazquez, Alejandro; Meyssignac, Benoit; Ablain, Michaël; Chenal, Jonathan; Barnoud, Anne; Fraudeau, Robin; Rousseau, Victor; Larnicol, Gilles; Pfeffer, Julia; Restano, Marco; Benveniste, Jérôme; Dibarboure, Gérald; Bignalet-Cazalet, François

doi:10.57757/IUGG23-3518

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Latest improvements in the assessment of the global ocean heat content and Earth energy imbalance from space gravimetry and altimetry

Authors

Marti, Florence
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Blazquez, Alejandro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Meyssignac, Benoit
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ablain, Michaël
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chenal, Jonathan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Barnoud, Anne
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fraudeau, Robin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rousseau, Victor
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Larnicol, Gilles
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Pfeffer, Julia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Restano, Marco
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Benveniste, Jérôme
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Dibarboure, Gérald
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bignalet-Cazalet, François
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Marti, F., Blazquez, A., Meyssignac, B., Ablain, M., Chenal, J., Barnoud, A., Fraudeau, R., Rousseau, V., Larnicol, G., Pfeffer, J., Restano, M., Benveniste, J., Dibarboure, G., Bignalet-Cazalet, F. (2023): Latest improvements in the assessment of the global ocean heat content and Earth energy imbalance from space gravimetry and altimetry, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3518

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020456

Abstract

Measuring the Earth energy imbalance (EEI) at the top of the atmosphere, is challenging as it is a globally integrated variable whose variations are small (0.5-1 W.m−2) compared to the amount of energy entering the climate system (~ 340 W/m²). Accuracies better than 0.1 W/m² are needed to evaluate the temporal variations of the EEI at decadal and longer time-scales. The CERES experiment provides EEI time variations with a typical uncertainty of ± 0.1 W/m² and shows a trend in EEI of 0.50 +/- 0.47 W/m² per decade over the period 2005-2019.The combination of space altimetry and space gravimetry measurements provides an estimate of the global ocean heat content (GOHC) change which is an accurate proxy of EEI (because >90% of the excess of energy stored in response to the EEI is accumulated in the ocean in the form of heat). In Marti et al. (2021), the GOHC was estimated at global scales based on the combination of space gravimetry and altimetry measurements over 2002-2016. Changes in the EEI were then derived with realistic estimates of its uncertainty.Here we present the improvements brought to the GOHC and EEI over an extended period (2002-2021), such as the calculation of the expansion efficiency of heat over the total water column, the improvement of barystatic sea level change solution, the empirical correction of the wet tropospheric correction of Jason-3 altimeter measurements (Barnoud et al., 2022).The space geodetic GOHC-EEI product based on space gravimetry and altimetry is available on AVISO at https://doi.org/10.24400/527896/a01-2020.003.