Global and regional ocean mass budget closure since 2003

Carsten Bjerre Ludwigsen (), Ole Baltazar Andersen, Ben Marzeion, Jan-Hendrik Malles, Hannes Müller Schmied, Petra Döll, Christopher Watson and Matt A. King
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Carsten Bjerre Ludwigsen: Technical University of Denmark, DTU Space
Ole Baltazar Andersen: Technical University of Denmark, DTU Space
Ben Marzeion: University of Bremen
Jan-Hendrik Malles: University of Bremen
Hannes Müller Schmied: Goethe University Frankfurt
Petra Döll: Goethe University Frankfurt
Christopher Watson: University of Tasmania
Matt A. King: University of Tasmania

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract In recent sea level studies, discrepancies have arisen in ocean mass observations obtained from the Gravity Recovery and Climate Experiment and its successor, GRACE Follow-On, with GRACE estimates consistently appearing lower than density-corrected ocean volume observations since 2015. These disparities have raised concerns about potential systematic biases in sea-level observations, with significant implications for our understanding of this essential climate variable. Here, we reconstruct the global and regional ocean mass change through models of ice and water mass changes on land and find that it closely aligns with both GRACE and density-corrected ocean volume observations after implementing recent adjustments to the wet troposphere correction and halosteric sea level. While natural variability in terrestrial water storage is important on interannual timescales, we find that the net increase in ocean mass over 20 years can be almost entirely attributed to ice wastage and human management of water resources.

Date: 2024
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DOI: 10.1038/s41467-024-45726-w

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