A5061815112- Oceanographic and Atmospheric Processes
- Climate variability and models
- Cryospheric studies and observations
- Meteorological Phenomena and Simulations
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Fluid Dynamics and Turbulent Flows
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- demographic modeling and climate adaptation
- Winter Sports Injuries and Performance
- Marine and coastal ecosystems
- Cyclone Separators and Fluid Dynamics
- Hydrocarbon exploration and reservoir analysis
- Fluid Dynamics and Vibration Analysis
- Landslides and related hazards
- Fluid dynamics and aerodynamics studies
- Geophysics and Gravity Measurements
- Geological Studies and Exploration
- Reservoir Engineering and Simulation Methods
- Geological formations and processes
- Fluid Dynamics and Mixing
- CO2 Sequestration and Geologic Interactions
- Nanofluid Flow and Heat Transfer
- Solar and Space Plasma Dynamics
The University of Melbourne
2020-2025
Australian Antarctic Division
2022-2024
University of Cambridge
2018-2022
British Antarctic Survey
2022
Northumbria University
2022
Australian National University
2015-2019
New York University Press
2019
Harvard University Press
2019
Chitose Institute of Science and Technology
2019
Bridge University
2019
Abstract A holistic review is given of the Southern Ocean dynamic system, in context crucial role it plays global climate and profound changes experiencing. The focuses on connections between different components drawing together contemporary perspectives from research communities, with objective closing loops our understanding complex network feedbacks overall system. targeted at researchers physical science ambition broadening their knowledge beyond specific field, aims facilitating...
Abstract Ocean turbulence contributes to the basal melting and dissolution of ice shelves by transporting heat salt toward ice. The meltwater causes a stable salinity stratification form beneath that suppresses turbulence. Here we use large-eddy simulations motivated shelf–ocean boundary layer (ISOBL) examine inherently linked processes stratification, their influence on melt rate. Our rectangular domain is bounded from above base where dynamic condition imposed. By varying speed flow...
The Southern Ocean is critical in regulating the global climate by playing a key role absorbing, transporting, and storing atmospheric carbon dioxide heat. This largely due to region's unique geography, which connects multiple ocean basins forms complex network of circulation. spans wide range scales, from planetary motions small-scale processes. Major large-scale features within its circulation include Antarctic Circumpolar Current, Slope Subpolar Gyres, Bottom Water formation, layered over...
The Atlantic Meridional Overturning Circulation (AMOC) plays a crucial role in the global climate system by transporting heat, salt, and nutrients across ocean basins. Its stability hinges on complex interplay between temperature salinity, although precise contributions of these factors remain unclear. This highlights need for systematic investigations to better understand predict AMOC behavior changing climate. In this study, we use turbulence-resolving simulations with laboratory-scale...
Abstract The Atlantic meridional overturning circulation (AMOC) in the North Ocean is shaped by mechanical and buoyancy forcing, with critical components like Gulf Stream, gyres, dense water formation, deep upwelling. AMOC undergoing significant variability due to changes forcing from rapidly changing climate. However, limited understanding resolution capturing convection boundary layer dynamics lead inaccuracies future ocean mass heat transport estimations. This study employs novel...
Abstract The transport of heat and salt through turbulent ice shelf–ocean boundary layers is a large source uncertainty within ocean models shelf cavities. This study uses small-scale, high-resolution, 3D numerical simulations to model an idealized layer beneath melting investigate the influence ambient turbulence on double-diffusive convection (i.e., driven by difference in diffusivities between salinity temperature). Isotropic forced throughout temperature are initialized with homogeneous...
Abstract We use idealized large-eddy simulations (LES) and a simple analytical theory to study the influence of submesoscales on concentration export sinking particles from mixed layer. find that restratification layer following development reduces rate vertical mixing which, in turn, enhances associated with gravitational settling. For neutral tracer initially confined layer, subinertial (submesoscale) motions enhance downward flux, consistent previous studies. However, sign advective flux...
A holistic review is given of the Southern Ocean dynamic system, in context crucial role it plays global climate and profound changes experiencing. The focuses on connections between different components drawing together contemporary perspectives from research communities, with objective 'closing loops' our understanding complex network feedbacks overall system. For purposes this review, system divided into four main components: large-scale circulation; cryosphere; turbulence; gravity waves....
The anisotropic minimum-dissipation (AMD) model for large-eddy simulation (LES) has been recently developed, and here the performance is examined in stratified plane Couette flow. To our knowledge, this first use of AMD resolved LES wall-bounded A comparison with previously published direct numerical simulations (DNS) provides insight into grid requirements. Prandtl numbers Pr = 0.7–70 a range Richardson show that performs well even strong stabilising buoyancy flux. We identify three new...
Abstract Turbulent mixing and energy dissipation have important roles in the global circulation but are not resolved by ocean models. We use direct numerical simulations of a geostrophic circulation, resolving turbulence convection, to examine rates mixing. As starting point, we focus on rotating rectangular basin forced surface temperature difference no wind stress. Emphasis is regime for horizontal also case strong buoyancy forcing (large Rayleigh number), which implies turbulent...
Ocean convection is a key mechanism that regulates heat uptake, water-mass transformation, CO2 exchange, and nutrient transport with crucial implications for ocean dynamics climate change. Both cooling to the atmosphere salinification, from evaporation or sea-ice formation, cause surface waters become dense down-well as turbulent convective plumes. The upper mixed layer in significantly deepened sustained by convection. In tropics subtropics, night-time main driver of convection, while mid-...
Convection in a rotating rectangular basin with differential thermal forcing at one horizontal boundary is examined using laboratory experiments. The experiments have an imposed heat flux condition, are large values of the Rayleigh number ( $Ra_{F}\sim O(10^{13}{-}10^{14})$ based on box length $L$ ), use water Prandtl $Pr\approx 4$ and small depth to aspect ratio. results show conditions for transition from non-rotating convection governed by inertial–buoyancy balance layer, circulation...
Abstract Antarctic ice shelves are losing mass at increasing rates, yet the ice‐ocean interactions that cause significant loss not well understood. A new approach of high‐resolution phase‐change simulations is used to model vertical melting into a stratified ocean. The ocean dynamics show complicated interplay between turbulent buoyant meltwater plume and double‐diffusive layers, while actively melts changes topography. At room temperatures, layer thickness closely linked scalloping. lower,...
Abstract Volume transport in the presence of fully resolved convection and turbulence is investigated a reentrant channel model Southern Ocean. The response meridional overturning zonal to variations wind buoyancy forcing quantified. Our simulations show two cells—a buoyancy‐driven lower cell wind‐driven upper cell. much larger extent magnitude than mean component smaller fluctuating cell, indicating that dominated by eddies and/or turbulent convective flow. In contrast, can be primarily...
Direct numerical simulations are used to investigate the nature of fully resolved small-scale convection and its role in large-scale circulation a rotating $f$ -plane rectangular basin with imposed surface temperature difference. The has horizontal geostrophic component deep vertical overturning. This paper focuses on convective no wind stress, buoyancy forcing sufficiently strong ensure turbulent within thermal boundary layer (horizontal Rayleigh numbers $Ra\approx 10^{12}{-}10^{13}$ )....
Abstract The relative roles of advective processes and mixing on the temporal adjustment meridional overturning circulation are examined, in particular effects either abyssal or upper ocean. Laboratory experiments with convectively driven imposed stirring rates show that adjusts toward an equilibrium state time scales governed by boundary layer region but independent rate bulk interior. stratification is dependent only layer. An idealized high-resolution ocean model shows (of a two-cell...
Abstract The melt rate of Antarctic ice shelves is key importance for rising sea levels and future climate scenarios. Recent observations beneath Larsen C Ice Shelf revealed an ocean boundary layer that was highly turbulent raised questions on the effect these rich flow dynamics heat transfer shelf rate. Directly motivated by field observations, we have conducted large-eddy simulations (LES) to further examine Shelf. LES initialized with uniform temperature salinity ( T–S ) included a...
The Southern Ocean holds a distinctive and pivotal position globally, connecting major ocean basins via its intricate circulation network. This makes it central hub of oceanic transport. Despite numerous studies, the precise mechanisms governing local regional dynamics influencing rapid poleward heat transport Antarctic ice melting, aided by Ocean, remains elusive. Thus, to enhance our comprehension role important regional-scale like Weddell, Ross Kerguelen gyre circulations, high-fidelity...
A holistic review is given of the Southern Ocean dynamic system, in context crucial role it plays global climate and profound changes experiencing. The focuses on connections between different components drawing together contemporary perspectives from research communities, with objective “closing loops” our understanding complex network feedbacks overall system. targeted at researchers physical science ambition broadening their knowledge beyond specific field facilitating better-informed...
A new study highlights the connected nature of Southern Ocean dynamic system, research priorities needed to understand its influence on climate change, importance cross-disciplinary collaborations.
Abstract The ice shelf–ocean boundary current has an important control on heat delivery to the base of shelf. Climate and regional models that include a representation shelf cavities often use coarse grid, results have strong dependence resolution near interface. This study with nonhydrostatic z -level configuration at turbulence-permitting (1 m). model performs well when compared against state-of-the-art large-eddy simulations, showing its capability in representing correct physics. We show...
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