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The Leeuwin Current and its eddies: An introductory overview

Citation

Waite, AM and Thompson, PA and Pesant, S and Feng, M and Beckley, LE and Domingues, CM and Gaughan, D and Hanson, CE and Holl, CM and Koslow, T and Meuleners, M and Montoya, JP and Moore, T and Muhling, BA and Paterson, H and Rennie, S and Strzelecki, J and Twomey, L, The Leeuwin Current and its eddies: An introductory overview, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 54, (8-10) pp. 789-796. ISSN 0967-0645 (2007) [Refereed Article]

DOI: doi:10.1016/j.dsr2.2006.12.008

Abstract

The Leeuwin Current (LC) is an anomalous poleward-flowing eastern boundary current that carries warm, low-salinity water southward along the coast of Western Australia. We present an introduction to a new body of work on the physical and biological dynamics of the LC and its eddies, collected in this Special Issue of Deep-Sea Research II, including (1) several modelling efforts aimed at understanding LC dynamics and eddy generation, (2) papers from regional surveys of primary productivity and nitrogen uptake patterns in the LC, and (3) the first detailed field investigations of the biological oceanography of LC mesoscale eddies. Key results in papers collected here include insight into the source regions of the LC and the Leeuwin Undercurrent (LUC), the energetic interactions of the LC and LUC, and their roles in the generation of warm-core (WC) and cold-core (CC) eddies, respectively. In near-shore waters, the dynamics of upwelling were found to control the spatio-temporal variability of primary production, and important latitudinal differences were found in the fraction of production driven by nitrate (the f-ratio). The ubiquitous deep chlorophyll maximum within LC was found to be a significant contributor to total water column production within the region. WC eddies including a single large eddy studied in 2000 contained relatively elevated chlorophyll a concentrations thought to originate at least in part from the continental shelf/shelf break region and to have been incorporated during eddy formation. During the Eddies 2003 voyage, a more detailed study comparing the WC and CC eddies illuminated more mechanistic details of the unusual dynamics and ecology of the eddies. Food web analysis suggested that the WC eddy had an enhanced "classic" food web, with more concentrated mesozooplankton and larger diatom populations than in the CC eddy. Finally, implications for fisheries management are addressed. © 2007 Elsevier Ltd. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
Author:Paterson, H (Dr Harriet Paterson)
ID Code:59783
Year Published:2007
Web of Science® Times Cited:59
Deposited By:Research Division
Deposited On:2009-12-17
Last Modified:2009-12-17
Downloads:0

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