The Turbulent Ocean

Thorpe, S. A.

doi:10.1017/cbo9780511819933

Cited by 426 publications

(405 citation statements)

References 703 publications

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“…By contrast, recent field measurements by Gregg and Horne [2009] and Lorke and Probst [2010] and numerical simulations by J.-L. Thiffeault and S. Childress (Stirring by swimming bodies, arXiv:0911.5511v1, 2010) all indicate negligible buoyancy flux due to animal swimming. These studies observe that the displacement of fluid across isopycnals occurs at length scales that are small relative to typical oceanic values of the Ozmidov buoyancy length scale, which measures the vertical size of the largest overturning eddies in a stratified fluid [Thorpe, 2005]. As noted by Visser [2007], fluid motion at such small scales is primarily dissipated by the fluid viscosity and therefore cannot contribute to large-scale diapycnal mixing.…”

Section: Introductionmentioning

confidence: 98%

Role of vertical migration in biogenic ocean mixing

Dabiri

2010

Geophysical Research Letters

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[1] Recent efforts to empirically measure and numerically simulate biogenic ocean mixing have consistently observed low mixing efficiency. This suggests that the buoyancy flux achieved by swimming animals in the ocean may be negligible in spite of the observed large kinetic energy dissipation rates. The present letter suggests that vertical migration across isopycnals may be necessary in order to generate overturning and subsequent mixing at length scales significantly larger than the individual animals. The animal-fluid interactions are simulated here using a simplified potential flow model of solid spheres migrating vertically in a stably stratified fluid. The interaction of successive solid bodies with each parcel of fluid is shown to lead, under certain conditions, to vertical displacement of the fluid parcels over distances much larger than the individual body size. These regions of displaced fluid are unstably stratified and, hence, amenable to large-scale overturning and efficient mixing.

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Section: Introductionmentioning

confidence: 98%

Role of vertical migration in biogenic ocean mixing

Dabiri

2010

Geophysical Research Letters

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“…The process is of great importance for the dynamics of the ocean [1][2][3], atmospheric pollution [4,5], bio-mass production [6,7] and oil-spill propagation [6,8], among other applications.…”

Section: Introductionmentioning

confidence: 99%

Steady state model and experiment for an oscillating grid turbulent two-layer stratified flow

2017

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Turbulence generated by an oscillating grid in a two-layer stably stratified system is a classical flow utilised to study various aspects of turbulence in presence of stratification without mean shear.This flow evolves in a quasi-steady state, in which the layer thickness and density difference evolves in a quasi-steady manner due to the large separation of timescales between the turbulence and the setup. We present an extension of the classical setup that enables full steady state conditions and in which the entrainment velocity can be prescribed separately from the Richardson number.We develop a theoretical box-model and show that the model is in good agreement with the experiments. The model allows to predict the transient response of the system for a variety of initial conditions and the imposed steady state. The new setup is necessary to obtain the steady position of the density interface, for example when using advanced optical techniques to measure the small-scale features of turbulence near the interface.

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“…The inner region includes: (1) the viscous sublayer (0 e y + e 5) where turbulent fluctuations are suppressed, molecular viscosity dominates momentum transport, and the mean velocity increases linearly with distance from the wall (U inner + = y + ), (2) a fully turbulent region, which overlaps with the outer region, where momentum transport is dominated by turbulent fluctuations or, more precisely, the Reynolds stresses, and (3) a buffer region transitional between (1) and (2). The inner region extends from the wall to a distance of approximately y = 0.15δ, where δ is the thickness of the velocity boundary layer, defined by the location where the flow velocity is 99% of the free stream velocity, U(δ) = 0.99U ∞ .…”

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confidence: 99%

Crossing Turbulent Boundaries: Interfacial Flux in Environmental Flows

Grant

Marušić²

2011

Environ. Sci. Technol.

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Advances in the visualization and prediction of turbulence are shedding new light on mass transfer in the turbulent boundary layer. These discoveries have important implications for many topics in environmental science and engineering, from the transport of earth-warming CO2 across the sea-air interface, to nutrient processing and sediment erosion in rivers, lakes, and the ocean, to pollutant removal in water and wastewater treatment systems. In this article we outline current understanding of turbulent boundary layer flows, with particular focus on coherent turbulence and its impact on mass transport across the sediment-water interface in marine and freshwater systems.

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The Turbulent Ocean

Cited by 426 publications

References 703 publications

Role of vertical migration in biogenic ocean mixing

Role of vertical migration in biogenic ocean mixing

Steady state model and experiment for an oscillating grid turbulent two-layer stratified flow

Crossing Turbulent Boundaries: Interfacial Flux in Environmental Flows

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