Ocean eddies strongly affect global mean sea-level projections

• Published in: Science Advances
• Main Authors: van Westen, René M., Dijkstra, Henk A.
• Format: Text
• Language: English
• Published: American Association for the Advancement of Science 2021
• Subjects: Research Articles; Antarctic; Southern Ocean; Antarc*
• Online Access: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8034847/; http://www.ncbi.nlm.nih.gov/pubmed/33837083; https://doi.org/10.1126/sciadv.abf1674

Current sea-level projections are based on climate models in which the effects of ocean eddies are parameterized. Here, we investigate the effect of ocean eddies on global mean sea-level rise (GMSLR) projections, using climate model simulations. Explicitly resolving ocean eddies leads to a more realistic Southern Ocean temperature distribution and volume transport. These quantities control the rate of basal melt, which eventually results in Antarctic mass loss. In a model with resolved ocean eddies, the Southern Ocean temperature changes lead to a smaller Antarctic GMSLR contribution compared to the same model in which eddies are parameterized. As a result, the projected GMSLR is about 25% lower at the end of this century in the eddying model. Relatively small-scale ocean eddies can hence have profound large-scale effects and consequently affect GMSLR projections.