Seasonal and interannual variations of upper ocean heat balance off the west coast of Australia

Feng, Ming; Biastoch, Arne; Böning, Claus W.; Caputi, Nick; Meyers, Gary

doi:10.1029/2008jc004908

Cited by 70 publications

(76 citation statements)

References 41 publications

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“…In a recent paper, Feng et al (2008) using the same model simulation (Barnier et al 2007) of the LC transport and variability found a modelled LC transport at 32°S of 2.4 Sv, lower than observed (3.4 Sv, Feng et al 2003). Their modelled LC is confined to the upper 300 m and east of 110°E as in our model results (green lines on section at 30°S Fig.…”

Section: Pathways and Volume Transport Of Ventil Water Exiting At 30°scontrasting

confidence: 55%

Origin and mechanism of Subantarctic Mode Water formation and transformation in the Southern Indian Ocean

et al. 2010

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International audienceThe sources and pathways of mode waters and lower thermocline waters entering the subtropical gyre of the Indian Ocean are examined. A Lagrangian analysis is performed on an eddy-admitting simulation of the Global Ocean performed by the DRAKKAR Group (NEMO/OPA), which captures the main observed features. We trace the subducted mode water's pathways, identify their formation regions and trace whether their source waters come from the Atlantic, Pacific or Indian sectors of the Southern Ocean. Three main sites for mode waters ventilation in the Indian sector are identified with different circulation pathways and source water masses: (a) just north of Kerguelen, where 4.2 Sv of lighter Subantarctic Mode Waters (SAMW); σ 0 ∼ 26.5) are exported--originating in the Atlantic and Agulhas Retroflection regions; (b) SW of Australia, where 6.5 Sv of medium SAMW (σ 0 ∼ 26.6) are ventilated--originating in the southern and denser Agulhas Retroflection region; (c) SW of Tasmania and along the South Australian coast, where 3 Sv of denser SAMW (σ 0 ∼ 26.75) are ventilated--originating from three sources: Leeuwin Current waters, Tasman Sea (Pacific) waters and Antarctic Surface Waters. In all cases, modelled mode waters were last ventilated in the Indian Ocean just north of the deepest winter-mixed layers. For the waters subducted SW of Australia, the last ventilation site extends even further north. Waters ventilated in the deepest mixed layers north of the Subantarctic Front are then re-ventilated 5 years later southwest of Australia. The model results raise new hypotheses that revisit the classical picture of the SAMW formation and transformation, where a large homogeneous mixed layer is subducted and 'slides' equatorward, essentially maintaining the T/S characteristics acquired at the surface. Firstly, the last ventilation of the modelled mode waters is not in the region of the deepest mixed layers, as previously thought, but further north in regions of moderate meso-scale eddy activity. Secondly, the model shows for the first time a significant source region for Indian Ocean mode waters coming from deep winter-mixed layers along the south Australian coast. Finally, this analysis shows how the mode water characteristics are modified after subduction, due to internal eddy mixing. The simulation shows that resolved eddies have a strong impact on the mixed layer properties and that isopycnal eddy mixing also contributes to the generation of more homogeneous mode water characteristics in the interior

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Section: Pathways and Volume Transport Of Ventil Water Exiting At 30°scontrasting

confidence: 55%

Origin and mechanism of Subantarctic Mode Water formation and transformation in the Southern Indian Ocean

et al. 2010

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“…Velocity is depth-averaged over the upper 250 m, a typical estimate of the Leeuwin Current depth (e.g. Feng et al, 2003Feng et al, , 2008. As in Fig.…”

Section: Velocity Field: Time-evolution Of the Leeuwin Current And Camentioning

confidence: 99%

Spatial patterns of warming off Western Australia during the 2011 Ningaloo Niño: Quantifying impacts of remote and local forcing

Benthuysen

Feng

Zhong

2014

Continental Shelf Research

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116

110

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“…Very strong La Niña and El Niño events were experienced in 1996-2000 (Feng et al 2008), which may have provided some extreme conditions for alongshore connectivity. Further study is necessary to understand connectivity under the influence of the ENSO cycle.…”

Section: Limitations and Future Researchmentioning

confidence: 99%

Retention and dispersal of shelf waters influenced by interactions of ocean boundary current and coastal geography

Feng

Slawinski

Beckley

et al. 2010

Mar. Freshwater Res.

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Retention and dispersal of shelf waters under the influence of ocean boundary currents is crucial to recruitment processes of many coastal species. In this study, a Lagrangian particle tracking method based on an eddy-resolving, data-assimilating, hydrodynamic model is used to study spatial variations of local retention rates and alongshore dispersal of surface waters on the continental shelf off the west coast of Australia. The circulation on the shelf off the west coast of Australia is dominated by the southward-flowing eastern boundary current, the Leeuwin Current, which is interrupted by episodic wind-driven, northward, inshore surface transport during the austral summer, and by mesoscale eddy formations during the austral winter. Low-retention shelf regions tend to experience high alongshore currents, owing to the near-shore influence of the Leeuwin Current, protruding coastal geography, or formation of mesoscale eddies, whereas high-retention regions are sheltered from the direct influence of the Leeuwin Current by coastal geographic features. Alongshore dispersal also exhibits spatial as well as seasonal heterogeneity, with predominantly southward dispersal during the austral winter, and more symmetrical dispersal during the austral summer. Shelf retention and seasonal dispersal are linked with recruitment processes of invertebrate and fish species off the west coast of Australia.

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Seasonal and interannual variations of upper ocean heat balance off the west coast of Australia

Cited by 70 publications

References 41 publications

Origin and mechanism of Subantarctic Mode Water formation and transformation in the Southern Indian Ocean

Origin and mechanism of Subantarctic Mode Water formation and transformation in the Southern Indian Ocean

Spatial patterns of warming off Western Australia during the 2011 Ningaloo Niño: Quantifying impacts of remote and local forcing

Retention and dispersal of shelf waters influenced by interactions of ocean boundary current and coastal geography

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