Variability of Antarctic circumpolar transport and the southern annular mode associated with the Madden-Julian Oscillation

Matthews, Adrian J. ORCID: https://orcid.org/0000-0003-0492-1168 and Meredith, Michael P. (2004) Variability of Antarctic circumpolar transport and the southern annular mode associated with the Madden-Julian Oscillation. Geophysical Research Letters, 31 (L24312). ISSN 1944-8007

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Abstract

The variability of oceanic Antarctic circumpolar transport and the atmospheric Southern Annular Mode (SAM) on intraseasonal (30–70-day) timescales is shown to be related to the tropical atmospheric Madden-Julian Oscillation (MJO) during southern winter. Approximately 7 days after anomalous MJO convection in the equatorial Indian Ocean peaks, an atmospheric extratropical response is set up with anomalous surface westerlies around almost the entire latitude circle at 60°S. This pattern projects strongly onto the SAM and leads to an acceleration of the eastward circumpolar transport around Antarctica, as measured by tide gauges and bottom pressure recorders. This ocean response is confirmed by a global ocean model, which shows a maximum in the transport through Drake Passage 3 days after the atmospheric extratropical response.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Environmental Sciences
Depositing User:	Rosie Cullington
Date Deposited:	16 Mar 2011 10:22
Last Modified:	20 Mar 2023 08:31
URI:	https://ueaeprints.uea.ac.uk/id/eprint/26326
DOI:	10.1029/2004GL021666

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