Eddy Compensation Dampens Southern Ocean Sea Surface Temperature Response to Westerly Wind Trends

Edward W. Doddridge, John Marshall, Hajoon Song, Jean Michel Campin, Maxwell Kelley, Larissa Nazarenko

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Anthropogenic influences have led to a strengthening and poleward shift of westerly winds over the Southern Ocean, especially during austral summer. We use observations, an idealized eddy-resolving ocean sea ice channel model, and a global coupled model to explore the Southern Ocean response to a step change in westerly winds. Previous work hypothesized a two time scale response for sea surface temperature. Initially, Ekman transport cools the surface before sustained upwelling causes warming on decadal time scales. The fast response is robust across our models and the observations: We find Ekman-driven cooling in the mixed layer, mixing-driven warming below the mixed layer, and a small upwelling-driven warming at the temperature inversion. The long-term response is inaccessible from observations. Neither of our models shows a persistent upwelling anomaly, or long-term, upwelling-driven subsurface warming. Mesoscale eddies act to oppose the anomalous wind-driven upwelling, through a process known as eddy compensation, thereby preventing long-term warming.

Original languageEnglish
Pages (from-to)4365-4377
Number of pages13
JournalGeophysical Research Letters
Volume46
Issue number8
DOIs
Publication statusPublished - 2019 Apr 28

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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