The transient response of the Southern Ocean to stratospheric ozone depletion

William J.M. Seviour*, Anand Gnanadesikan, Darryn W. Waugh

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

17 Citations (Scopus)
130 Downloads (Pure)

Abstract

Recent studies have suggested that the response of the Southern Ocean to stratospheric ozone depletion is nonmonotonic in time; consisting of an initial cooling followed by a long-term warming. This result may be significant for the attribution of observed Southern Ocean temperature and sea ice trends, but the time scale and magnitude of the response is poorly constrained, with a wide spread among climate models. Furthermore, a long-lived initial cooling period has only been observed in a model with idealized geometry and lacking an explicit representation of ozone. Here the authors calculate the transient response of the Southern Ocean to a step-change in ozone in a comprehensive coupled climate model, GFDL-ESM2Mc. The Southern Ocean responds to ozone depletion with an initial cooling, lasting 25 yr, followed by a warming. The authors extend previous studies to investigate the dependence of the response on the ozone forcing as well as the regional pattern of this response. The response of the Southern Ocean relative to natural variability is shown to be largely independent of the initial state. However, the magnitude of this response is much less than that of natural variability found in the model, which limits its influence and detectability.

Original languageEnglish
Pages (from-to)7383-7396
Number of pages14
JournalJournal of Climate
Volume29
Issue number20
Early online date28 Sep 2016
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • Atmosphere-ocean interaction
  • Coupled models
  • Ozone
  • Southern Ocean

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