Browsing Cambridge University by Author "Taylor, John Ryan"
Now showing items 1-19 of 19
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A new method for isolating turbulent states in transitional stratified plane Couette flow
Taylor, John Ryan; Deusebio, E; Caulfield, Colm-cille Patrick; Kerswell, Richard Rodney (Cambridge University PressJournal of Fluid Mechanics, 2016-10-26)We present a new adaptive control strategy to isolate and stabilize turbulent states in transitional, stably stratified plane Couette flow in which the gravitational acceleration (non-dimensionalized as the bulk Richardson ...
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Diapycnal mixing in layered stratified plane Couette flow quantified in a tracer-based coordinate
Zhou, Qi; Caulfield, Colm-cille Patrick; Linden, Paul Frederick; Taylor, John Ryan (Cambridge University PressJournal of Fluid Mechanics, 2017-07)The mixing properties of statically stable density interfaces subject to imposed vertical shear are studied using direct numerical simulations of stratified plane Couette flow. The simulations are designed to investigate ...
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Low- and high-frequency oscillatory winds synergistically enhance nutrient entrainment and phytoplankton at fronts
Whitt, DB; Lévy, M; Taylor, John Ryan (AGU PublicationsJournal of Geophysical Research: Oceans, 2017-02-10)When phytoplankton growth is limited by low nutrient concentrations, full-depth-integrated phytoplankton biomass increases in response to intermittent mixing events that bring nutrient-rich waters into the sunlit surface ...
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Mesoscale and Submesoscale Effects on Mixed Layer Depth in the Southern Ocean
Bachman, Scott Daniel; Taylor, John Ryan; Adams, KA; Hosegood, P (American Meteorological SocietyJournal of Physical Oceanography, 2017-09-01)Submesoscale dynamics play a key role in setting the stratification of the ocean surface mixed layer and mediating air–sea exchange, making them especially relevant to anthropogenic carbon uptake and primary productivity ...
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Modelling of partially-resolved oceanic symmetric instability
Bachman, Scott Daniel; Taylor, John Ryan (ElsevierOcean Modelling, 2014-08-04)A series of idealized numerical models have been developed to investigate the effects of partially resolved symmetric instability (SI) in oceanic general circulation models. An analysis of the energetics of symmetric instability ...
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Nonlinear evolution of linear optimal perturbations of strongly stratified shear layers
Taylor, John Ryan; Caulfield, Colm-cille Patrick; Kaminski, AK (Cambridge University PressJournal of Fluid Mechanics, 2017-08-25)The Miles-Howard theorem states that a necessary condition for normal-mode instability in parallel, inviscid, steady stratified shear flows is that the minimum gradient Richardson number, $Ri_{g,min}$, is less than 1/4 ...
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Parameterization of Frontal Symmetric Instabilities. I: Theory for Resolved Fronts
Bachman, Scott Daniel; Fox-Kemper, B; Taylor, John Ryan; Thomas, LN (ElsevierOcean Modelling, 2017-01-01)A parameterization is proposed for the effects of symmetric instability (SI) on a resolved front. The parameterization is dependent on external forcing by surface buoyancy loss and/or down-front winds, which reduce potential ...
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Robust identification of dynamically distinct regions in stratified turbulence
Portwood, GD; de, Bruyn Kops SM; Taylor, John Ryan; Salehipour, H; Caulfield, Colm-cille Patrick (Cambridge University PressJournal of Fluid Mechanics, 2016-10-18)We present a new robust method for identifying three dynamically distinct regions in a stratified turbulent flow, which we characterise as quiescent flow, intermittent layers and turbulent patches. The method uses the ...
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Self-similar mixing in stratified plane Couette flow for varying Prandtl number
Zhou, Qi; Taylor, John Ryan; Caulfield, Colm-cille Patrick (Cambridge University PressJournal of Fluid Mechanics, 2017-06-10)We investigate fully developed turbulence in stratified plane Couette flows using direct numerical simulations similar to those reported by Deusebio et al. (J. Fluid Mech., vol. 781, 2015, pp. 298-329) expanding the range ...
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Spontaneous Wave Generation at Strongly Strained Density Fronts
Shakespeare, Callum J; Taylor, John Ryan (American Meteorological SocietyJournal of Physical Oceanography, 2016-06-23)A simple analytical model is presented describing the spontaneous generation of inertia–gravity waves at density fronts subjected to strong horizontal strain rates. The model considers fronts of arbitrary horizontal and ...
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Supporting data for Nonlinear evolution of linear optimal perturbations of strongly stratified shear layers
Taylor, John Ryan; Kaminski, AK; Caulfield, Colm-cille Patrick
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Supporting data for Self-similar mixing in stratified plane Couette flow for varying Prandtl number
Taylor, John Ryan; Zhou, Qi; Caulfield, Colm-cille Patrick
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Supporting data for: Diapycnal mixing in layered stratified plane Couette flow quantified in a tracer-based coordinate
Taylor, John Ryan; Zhou, Qi; Caulfield, Colm-cille Patrick
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Supporting data for: Submesoscale Rossby Waves on the Antarctic Circumpolar Current
Taylor, John Ryan; Bachman, Scott; Stamper, Megan; Adams, Katherine; Hosegood, Phil; Sallee, Jean-Baptiste; Torres, Ricardo
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Synoptic-to-planetary scale wind variability enhances phytoplankton biomass at ocean fronts
Whitt, DB; Taylor, John Ryan; Lévy, M (American Geophysical UnionJournal of Geophysical Research: Oceans, 2017-06-01)In nutrient-limited conditions, phytoplankton growth at fronts is enhanced by winds, which drive upward nutrient fluxes via enhanced turbulent mixing and upwelling. Hence, depth-integrated phytoplankton biomass can be 10 ...
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Testing linear marginal stability in stratified shear layers
Howland, Christopher; Taylor, John Ryan; Caulfield, Colm-cille PatrickWe use two-dimensional direct numerical simulations of Boussinesq stratified shear layers to investigate the influence of the minimum gradient Richardson number Rim on the early time evolution of Kelvin–Helmholtz instability ...
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Turbulent mixing, restratification, and phytoplankton growth at a submesoscale eddy
Taylor, John Ryan (WileyGeophysical Research Letters, 2016-05-13)High-resolution large-eddy simulations are used to study the influence of submesoscale mixed layer instability and small-scale turbulence on phytoplankton growth in light-limited conditions. Four simulations are considered ...