Process-oriented modeling studies of the 5500-km-long boundary flow off western and southern Australia

Batteen, Mary L.; Miller, Henry A.

doi:10.1016/j.csr.2008.11.011

Cited by 9 publications

(4 citation statements)

References 55 publications

(128 reference statements)

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“…A number of papers suggest that the Leeuwin Current is part of a continuous 5500 km coastal current system [e.g., Ridgway and Condie, 2004;Batteen and Miller, 2009;Ridgway and Godfrey, 2015]. While these studies have successfully tracked sea surface height/temperature anomalies around the Australian coast, it has not been clear how much water makes it directly from the source regions to the Great Australian Bight.…”

Section: Particle Connectivity In the Indian Ocean And Great Australimentioning

confidence: 99%

Sources, fate, and pathways of Leeuwin Current water in the Indian Ocean and Great Australian Bight: A Lagrangian study in an eddy‐resolving ocean model

Bull

Sebille

2016

JGR Oceans

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The Leeuwin Current is the dominant circulation feature in the eastern Indian Ocean, transporting tropical and subtropical water southward. While it is known that the Leeuwin Current draws its water from a multitude of sources, existing Indian Ocean circulation schematics have never quantified the fluxes of tropical and subtropical source water flowing into the Leeuwin Current. This paper uses virtual Lagrangian particles to quantify the transport of these sources along the Leeuwin Current's mean pathway. Here the pathways and exchange of Leeuwin Current source waters across six coastally bound sectors on the south‐west Australian coast are analyzed. This constitutes the first quantitative assessment of Leeuwin Current pathways within an offline, 50 year integration time, eddy‐resolving global ocean model simulation. Along the Leeuwin Current's pathway, we find a mean poleward transport of 3.7 Sv in which the tropical sources account for 60–78% of the transport. While the net transport is small, we see large transports flowing in and out of all the offshore boundaries of the Leeuwin Current sectors. Along the Leeuwin Current's pathway, we find that water from the Indonesian Throughflow contributes 50–66% of the seasonal signal. By applying conditions on the routes particles take entering the Leeuwin Current, we find particles are more likely to travel offshore north of 30°S, while south of 30°S, particles are more likely to continue downstream. We find a 0.2 Sv pathway of water from the Leeuwin Current's source regions, flowing through the entire Leeuwin Current pathway into the Great Australian Bight.

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Section: Particle Connectivity In the Indian Ocean And Great Australimentioning

confidence: 99%

Sources, fate, and pathways of Leeuwin Current water in the Indian Ocean and Great Australian Bight: A Lagrangian study in an eddy‐resolving ocean model

Bull

Sebille

2016

JGR Oceans

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“…). The southward flowing Holloway Current merges into the Leeuwin Current at 22°S, which stretches over 5500 km, meandering southward along the continental shelf from the North West Cape down to the Great Australian Bite (Batteen & Miller ). Although there is little evidence supporting the role of these currents in the transport of coral larvae (Underwood et al .…”

Section: Geographical Stabilitymentioning

confidence: 99%

Exploring Symbiodinium diversity and host specificity in Acropora corals from geographical extremes of Western Australia with 454 amplicon pyrosequencing

et al. 2014

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Scleractinian corals have demonstrated the ability to shuffle their endosymbiotic dinoflagellate communities (genus Symbiodinium) during periods of acute environmental stress. This has been proposed as a mechanism of acclimation, which would be increased by a diverse and flexible association with Symbiodinium. Conventional molecular techniques used to evaluate Symbiodinium diversity are unable to identify genetic lineages present at background levels below 10%. Next generation sequencing (NGS) offers a solution to this problem and can resolve microorganism diversity at much finer scales. Here we apply NGS to evaluate Symbiodinium diversity and host specificity in Acropora corals from contrasting regions of Western Australia. The application of 454 pyrosequencing allowed for detection of Symbiodinium operational taxonomic units (OTUs) occurring at frequencies as low as 0.001%, offering a 10,000-fold increase in sensitivity compared to traditional methods. All coral species from both regions were overwhelmingly dominated by a single clade C OTU (accounting for 98% of all recovered sequences). Only 8.5% of colonies associated with multiple clades (clades C and D, or C and G), suggesting a high level of symbiont specificity in Acropora assemblages in Western Australia. While only 40% of the OTUs were shared between regions, the dominance of a single OTU resulted in no significant difference in Symbiodinium community structure, demonstrating that the coral-algal symbiosis can remain stable across more than 15° of latitude and a range of sea surface temperature profiles. This study validates the use of NGS platforms as tools for providing fine-scale estimates of Symbiodinium diversity and can offer critical insight into the flexibility of the coral-algal symbiosis.

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“…An atypical eastern boundary current, the Leeuwin Current, flows poleward along the continental shelf of Western Australia (Batteen and Miller 2009) and carries warm, low salinity surface waters from the tropical north of the state. This results in the southward extension of many tropical marine fish species with pelagic life cycle phases into the temperate waters of south-western Australia, some of which may use estuaries as juveniles or infrequently as adults (Hutchins and Pearce 1994;Beckley et al 2009).…”

Section: Study Areamentioning

confidence: 99%

The Importance of Regional, System-Wide and Local Spatial Scales in Structuring Temperate Estuarine Fish Communities

Valesini

Tweedley

Clarke

et al. 2013

Estuaries and Coasts

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An extensive literature base worldwide demonstrates how spatial differences in estuarine fish assemblages are related to those in the environment at (bio)regional, estuary-wide or local (withinestuary) scales. Few studies, however, have examined all three scales, and those including more than one have often focused at the level of individual environmental variables rather than scales as a whole. This study has identified those spatial scales of environmental differences, across regional, estuary-wide and local levels, that are most important in structuring ichthyofaunal composition throughout south-western Australian estuaries. It is the first to adopt this approach for temperate microtidal waters. To achieve this, we have employed a novel approach to the BIOENV routine in PRIMER v6 and a modified global BEST test in an alpha version of PRIMER v7. A combination of all three scales best matched the pattern of ichthyofaunal differences across the study area (ρ = 0.59; P = 0.001), with estuary-wide and regional scales accounting for about twice the variability of local scales. A shade plot analysis showed these broader-scale ichthyofaunal differences were driven by a greater diversity of marine and estuarine species in the permanently-open west coast estuaries and higher numbers of several small estuarine species in the periodically-open south coast estuaries. When interaction effects were explored, strong but contrasting influences of local environmental scales were revealed within each region and estuary type. A quantitative decision tree for predicting the fish fauna at any nearshore estuarine site in south-western Australia has also been produced. The estuarine management implications of the above findings are highlighted.

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Process-oriented modeling studies of the 5500-km-long boundary flow off western and southern Australia

Cited by 9 publications

References 55 publications

Sources, fate, and pathways of Leeuwin Current water in the Indian Ocean and Great Australian Bight: A Lagrangian study in an eddy‐resolving ocean model

Sources, fate, and pathways of Leeuwin Current water in the Indian Ocean and Great Australian Bight: A Lagrangian study in an eddy‐resolving ocean model

Exploring Symbiodinium diversity and host specificity in Acropora corals from geographical extremes of Western Australia with 454 amplicon pyrosequencing

The Importance of Regional, System-Wide and Local Spatial Scales in Structuring Temperate Estuarine Fish Communities

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