Variability of biological production in low wind-forced regional upwelling systems: A case study off southeastern Australia

Nieblas, Anne-Elise, Sloyan, Bernadette M., Hobday, Alistair J., Coleman, Richard and Richardson, Anthony J. (2009) Variability of biological production in low wind-forced regional upwelling systems: A case study off southeastern Australia. Limnology and Oceanography, 54 5: 1548-1558. doi:10.4319/lo.2009.54.5.1548

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Author Nieblas, Anne-Elise
Sloyan, Bernadette M.
Hobday, Alistair J.
Coleman, Richard
Richardson, Anthony J.
Title Variability of biological production in low wind-forced regional upwelling systems: A case study off southeastern Australia
Journal name Limnology and Oceanography   Check publisher's open access policy
ISSN 0024-3590
1939-5590
Publication date 2009-09
Year available 2009
Sub-type Article (original research)
DOI 10.4319/lo.2009.54.5.1548
Open Access Status File (Publisher version)
Volume 54
Issue 5
Start page 1548
End page 1558
Total pages 11
Place of publication Waco, TX 76710 United States
Publisher American Society of Limnology and Oceanography
Collection year 2010
Language eng
Subject C1
960507 Ecosystem Assessment and Management of Marine Environments
069902 Global Change Biology
Formatted abstract
Temporal variability of upwelling activity and primary production is examined for a southeastern Australian upwelling system off the Bonney Coast (36.5°S–38.5°S, 138°E–142°E). Three indices of upwelling activity and primary production are developed based on alongshore wind stress, upwelling plume area (anomalous sea surface temperature), and primary productivity of the upwelling plume (approximated using anomalous chlorophyll a concentration). The majority of the upwelling activity occurs during the austral summer upwelling season from November to March. Interannual variability in the wind forcing for this region shows marginal correspondence to El Nino–Southern Oscillation variability. Intraseasonal variability followed four distinct phases within the upwelling season of "onset," "sustained," "quiescent," and "downwelling" periods. The Bonney Upwelling is a predictable regional system with temporal variability of its physical forcing that is similar to larger, more intensely studied coastal wind-driven upwelling systems. However, we find that the Bonney Coast is a low wind-forced upwelling region compared to other upwelling systems. Simple linear quantitative models developed between upwelling activity predictors (wind and upwelling plume area) and the biological response (chlorophyll a) explain 40–50% of the seasonal variability of approximated phytoplankton productivity along the Bonney Coast. As primary productivity in a low-wind system is not affected by the deleterious effects of turbulence and advection, these simple models are able to predict chlorophyll variability in the Bonney region. Models developed in this study provide a method of assessing the effect of decadal or longer variability of chlorophyll concentration in low wind-forcing upwelling systems at regional and global scales.
Keyword South-Australia
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
2010 Higher Education Research Data Collection
Ecology Centre Publications
 
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Created: Thu, 03 Sep 2009, 07:45:20 EST by Mr Andrew Martlew on behalf of School of Mathematics & Physics