Environmental Science
8 years ago

Anticyclonic winds off Europe drive major shifts in Atlantic sea levels

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Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability
Nicolas Barrier, Anne‐Marie Tréguier, Christophe Cassou, Julie Deshayes

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Subtropical sea-surface height variability is influenced by winter North-Atlantic weather regimes. The Atlantic-Ridge (AR) weather regime has the strongest correlation with sea-level anomalies, impacting the subtropical gyre intensity. During AR events, anticyclonic wind anomalies off Europe shift wind-stress curl northward, affecting subtropical sea-surface height. This altered balance and ocean dynamics contribute to interannual variability in the Atlantic subtropical gyre. Winter season plays a key role in explaining the largest part of this variability, with AR being as important as the North Atlantic Oscillation (NAO).