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Showing 1 to 18 of 18 for “"geophysical fluid dynamics"”.
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Nontraditional approximation in geophysical fluid dynamics
In the conventional approach to geophysical fluid dynamics, only the horizontal components of the Coriolis force due to horizontal motions of the fluid are taken into account. All the other components of the Coriolis force, which are called the non-traditional (NT) terms, are considered to be small …
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Generalised nonlinear stability of stratified shear flows: adjoint-based optimisation, Koopman modes, and reduced models
… Neil Balmforth of UBC during the 2015 WHOI Geophysical Fluid Dynamics summer programme, investigating stochastic homoclinic bifurcations.
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Statistical field estimation and scale estimation for complex coastal regions and archipelagos
… requirement in realistic computational geophysical fluid dynamics is the optimal estimation of gridded fields and of spatial-temporal scales directly from the spatially irregular and multivariate data sets that are collected by varied instruments and sampling schemes. In this work, we …
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Multiscale Modeling and Simulation of Turbulent Geophysical Flows
… accurate and efficient numerical simulation of geophysical flows is of great interest in numerical weather prediction and climate modeling as well as in numerous critical areas and industries, such as agriculture, construction, tourism, transportation, weather-related disaster management, and …
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Linear and nonlinear dynamics in stratified shear flows
… shear flows, in which a less dense layer of fluid lies above and moves counter to a more dense layer below, are ubiquitous in geophysical fluid dynamics. These are often found to be unstable if the non-dimensional Richardson number Ri, quantifying the strength of stratification to shear, is …
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Environmental changes and regime shift analysis in the southern Benguela using output from earth system models
… Output from two earth system models (ESMs): the Geophysical Fluid Dynamics Laboratory (GFDL) and the Institut Pierre Simon Laplace (IPSL) was integrated with shared socioeconomic pathways (SSPs) to simulate environmental changes over time under historical scenarios (1970 – 2014), as well as low …
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“If it happened in…” a pseudo-global warming assessment of tropical cyclone tornadoes
… Research on Climate version 5 (MIROC5), and Geophysical Fluid Dynamics Laboratory Climate Model version 3 (CM3). Changes in TC intensity and TCT production for the PGW-modified Ivan are documented and analyzed. Compared to the CTRL, all three PGW simulations show an increase in TC intensity, …
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Hydrodynamics of Cyclogenesis from Numerical Simulations
… and by experimentalists to understand complex geophysical flows. Therefore in this work, the same RRBC model is used to carry out 3D numerical experiments in a shallow cylindrical domain filled with Boussinesq fluid. In atmospheric flows, the large eddies are responsible for turbulent transport …
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Midlatitude Storm Track Response to Increased Greenhouse Warming
… analyzing the eddy statistics simulated in the Geophysical Fluid Dynamics Laboratory (GFDL) CM2.1 model simulations (IPCC AR4 model), we confirm the poleward and upward shift and intensification of the storm tracks in the late 21st century. It has been found that this key feature is generally …
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Nonlinear interactions of internal gravity waves in a continuously stratified fluid
… which can arise in a density-stratified fluid. They exist throughout the oceans and atmosphere, the oceanic internal wavefield being sufficiently energetic for nonlinear effects to play an important role in the internal wave dynamics. Numerical studies of oceanic internal waves (such as …
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Nonlinear interactions of internal gravity waves in a continuously stratified fluid
… which can arise in a density-stratified fluid. They exist throughout the oceans and atmosphere, the oceanic internal wavefield being sufficiently energetic for nonlinear effects to play an important role in the internal wave dynamics. Numerical studies of oceanic internal waves (such as …
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Synoptische, diagnostische und numerische Untersuchungen der Intensitätsänderungen von tropischen Wirbelstürmen und Monsuntiefs
… and incorporate typhoon boguses of the Geophysical Fluid Dynamics Laboratory and the Japan Meteorological Agency. The monsoon depression developed over northwestern Australia in February 1994. After remaining quasi-stationary for several days after its formation in the monsoon trough, …
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Modelling Viscous Flow and Elastic Deformation in Fold-Thrust Belts and Magmatic Intrusions
Fluid dynamics governs many phenomena on the Earth's surface and interior, from the emplacement of fluid magma, to the viscous deformation of mountain ranges on the longest time scales. Understanding these processes presents a challenge to traditional modelling techniques. However, simplifying …
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Laminar Analogues of Atmospheric Phenomena
… The first portion of the research concerns the dynamics of eyes (regions of reversed flow) at the centres of vortices. We expand upon previous work investigating the process of eye formation in shallow rotating convection. Through a series of numerical simulations we observe that, as thermal …
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The evolution and breakdown of submesoscale instabilities
Ocean submesoscales are the subject of increasing focus in the oceanographic literature; with instrumentation now more capable of observing them in situ and numerical models now able to reach the resolution required to more fully capture them. Submesoscales are typified by horizontal spatial scales …
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Dispersive waves in Earth's outer core
… generation and propagation of waves in Earth's fluid outer core, with the objective of better understanding their role in maintaining our planet's magnetic field. The classes of waves studied, which owe their existence both to the rapid rotation of the Earth about its axis and the vibration of …
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Complex Fluid Dynamics: From Laminar to Geophysical Flows
… and numerical work relating to two problems in fluid flow. We first treat the oldest, hardest, and arguably one of the most important problems in boundary layer theory: determining the drag on a sphere and an infinite cylinder moving at a fixed speed in a highly viscous fluid. We necessarily …