Observations of large-scale ocean-atmosphere interaction in the Southern Hemisphere

Ciasto, Laura M. and Thompson, David W. J. ORCID: https://orcid.org/0000-0002-5413-4376 (2008) Observations of large-scale ocean-atmosphere interaction in the Southern Hemisphere. Journal of Climate, 21 (6). 1244–1259. ISSN 0894-8755

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The authors provide a detailed examination of observed ocean–atmosphere interaction in the Southern Hemisphere (SH). Focus is placed on the observed relationships between variability in SH extratropical sea surface temperature (SST) anomalies, the Southern Annular Mode (SAM), and the El Niño–Southern Oscillation (ENSO). Results are examined separately for the warm (November–April) and cold (May–October) seasons and for monthly and weekly time scales. It is shown that the signatures of the SAM and ENSO in the SH SST field vary as a function of season, both in terms of their amplitudes and structures. The role of surface turbulent and Ekman heat fluxes in driving seasonal variations in the SAM- and ENSO-related SST anomalies is investigated. Analyses of weekly data reveal that variability in the SAM tends to precede anomalies in the SST field by ∼1 week, and that the e-folding time scale of the SAM-related SST field anomalies is at least 4 months. The persistence of the SAM-related SST anomalies is consistent with the passive thermal response of the Southern Ocean to variations in the SAM, and seasonal variations in the persistence of the SAM-related SST anomalies are consistent with the seasonal cycle in the depth of the ocean mixed layer.

Item Type: Article
Uncontrolled Keywords: southern hemisphere,large-scale motions,sea surface temperature,enso
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 07 Jun 2022 14:30
Last Modified: 23 Oct 2022 03:49
URI: https://ueaeprints.uea.ac.uk/id/eprint/85428
DOI: 10.1175/2007JCLI1809.1

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