Summer sea surface temperature fronts and elevated chlorophyll-a in the entrance to Spencer Gulf, South Australia

Peter Petrusevics, John Bye, J Luick, C Teixeira

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Historical and recent oceanographic cruise data, MODIS chlorophyll-a satellite data, and an analytical model are used to examine SST fronts in the entrance to Spencer Gulf, South Australia. The fronts (2-3 °C) due to the contrast between warm Spencer Gulf waters and cooler waters of the continental shelf are readily observable on satellite imagery. Three water masses: cool, fresh upwelled shelf water; warm, salty Great Australian Bight water; and very warm and salty Spencer Gulf bottom water occupy the area. In consequence a summer density minimum is formed at the entrance to Spencer Gulf. The analytical model predicts that this thermohaline structure sets up an ageostrophic circulation, which favours upwelling in the central portion of the entrance. This is confirmed by the satellite data which show an increased chlorophyll-a concentration in the vicinity of the upwelling.

    Original languageEnglish
    Pages (from-to)849-856
    Number of pages8
    JournalContinental Shelf Research
    Volume31
    Issue number7-8
    DOIs
    Publication statusPublished - 2011

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