2004), Variability of the Antarctic circumpolar transport and the Southern Annular Mode associated with the Madden‐Julian Oscillation, Geophys. Res

[1] 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 c...

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Bibliographic Details
Main Authors: Adrian J. Matthews, Michael P. Meredith
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
interactions (0312
Antarctic
Drake Passage
Indian
The Antarctic
Antarc*
Antarctica
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.508.4458
http://envam1.env.uea.ac.uk/matthewsmeredith2004.pdf
Description
Summary:[1] 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 60S. 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. INDEX

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