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 Just Accepted

This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.


Dipole vortices in the Great Australian Bight

George Cresswell, L Lund-Hansen, Morten Nielsen

Abstract

Shipboard measurements in late 2006 by the Danish Galathea 3 Expedition and satellite SST images revealed a chain of cool and warm “mushroom” dipole vortices that mixed warm, salty, oxygen-poor waters on and near the continental shelf of the Great Australian Bight (GAB) with cooler, fresher, oxygen-rich waters offshore. The alternating “jets” flowing into the mushrooms were directed mainly northward and southward and differed in temperature by only 1.5°C; the salinity difference, however, was as much as 0.5, and therefore quite large. The GAB waters were slightly denser than the cooler offshore ones. The field of dipoles evolved and distorted, but appeared to drift westward at 5 km day-1 over two weeks, and one new mushroom carried GAB water southward at 7 km day-1. Other features encountered between Cape Leeuwin and Tasmania included the Leeuwin Current, the South Australian Current, the Flinders Current, and the waters of Bass Strait.

MF13305  Accepted 03 May 2014
 
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