University of Tasmania
Browse
2007_Ansorge_influence_of_Antarctic.pdf (523.56 kB)

The influence of the Antarctic Circumpolar Current on the oceanographic setting of a sub-Antarctic island

Download (523.56 kB)
journal contribution
posted on 2023-11-02, 04:34 authored by IJ Ansorge, JRE Lutjeharms
The circulation in the Southern Ocean is dominated by the Antarctic Circumpolar Current (ACe), which is the only current that flows completely around the globe. The ACC is a complex system consisting of narrow regions of sharp horizontal density gradients, which extend through the entire water column as frontal bands separated by broad zones with less intense gradients. Meridional excursions from the otherwise zonaillow in the form of meanders or mesoscale eddies occur in regions of prominent bathymetric features, suggesting a close relationship between the level of mesoscale sea surface variability and bottom topography, The Prince Edward Islands (Marion Island and Prince Edward Island) lying within the Polar Frontal Zone (PFZ) at approximately 38 DE, 47 os form a very special terrestrial habitat and have, for this reason, been designated a declared nature reserve. The ecology of the islands is directly dependent on its ocean environment, With the advent of satellite altimetry it has become apparent that the Prince Edward Islands are located on the northern border of a region of remarkably high mesoscale variability. The source of this variability lies where the current jet associated with the ACC intersects the South-West Indian Ridge. From here newly generated eddies are steered by the bottom topography past the Prince Edward Islands. '[his discovery probably explains the high physical and biological variability found at the islands, and warrants further analysis,

History

Publication title

Papers & Proceedings of the Royal Society of Tasmania

Volume

141

Pagination

59-66

ISSN

0080-4703

Rights statement

Copyright Royal Society of Tasmania.

Usage metrics

    Royal Society of Tasmania

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC