Louis-Philippe Nadeau

Louis-Philippe Nadeau
Université du Québec à Rimouski UQAR | uqar · Institut des Sciences de la Mer de Rimouski (ISMER)

PhD

About

34
Publications
2,747
Reads
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317
Citations
Citations since 2017
18 Research Items
252 Citations
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20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Additional affiliations
April 2013 - January 2015
Massachusetts Institute of Technology
Position
  • PostDoc Position
October 2010 - March 2013
New York University
Position
  • PostDoc Position
Education
September 2005 - December 2010
McGill University
Field of study
  • Physical Oceanography

Publications

Publications (34)
Article
Full-text available
A simplified model, representing the dynamics of marine organic particles in a given size range experiencing coagulation and fragmentation reactions, is developed. The framework is based on a discrete size spectrum on which reactions act to exchange properties between different particle sizes. The reactions are prescribed according to triplet inter...
Preprint
Full-text available
A simplified model, representing the dynamics of marine organic particles in a given size range experiencing coagulation and fragmentation reactions is developed. The framework is based on a discrete size spectrum on which reactions act to exchange properties between different particle sizes. The reactions are prescribed according to triplets inter...
Article
A new coupled model is developed to investigate interactions among geostrophic, Ekman and near-inertial (NI) flows. The model couples a time-dependent nonlinear slab Ekman layer with a two-layer shallow water model. Wind stress forces the slab layer and horizontal divergence of slab-layer transport appears as a forcing in the continuity equation of...
Article
Full-text available
Large-eddy simulations (Δx = Δz = 1 m) are used to examine vertical ocean heat fluxes driven by mechanical and buoyancy forcing across idealized sea ice leads. Forcing parameters approximate conditions from a shear event during the Surface Heat Budget of the Arctic (SHEBA) experiment in March 1998. In situ measurements near the lead showed isopycna...
Article
Full-text available
A toy model for the deep ocean overturning circulation in multiple basins is presented and applied to study the role of buoyancy forcing and basin geometry in the ocean’s global overturning. The model reproduces the results from idealized general circulation model simulations, and provides theoretical insights into the mechanisms that govern the st...
Poster
The ocean biological pump transports organic carbon produced in surface waters to the seafloor, where it can be sequestered in the sediments or consumed by benthic organisms. Aggregates constitute an important fraction of the organic matter in the ocean. However, only few biogeochemical models include the formation of aggregates (i.e. coagulation),...
Article
Full-text available
The ocean’s inverse cascade of energy from small to large scales has been confirmed from satellite altimetry for scales larger than 100 km. However, measurements of the direct energy cascade to smaller scales have remained difficult to obtain. Here, the possibility of estimating these energy transfers to smaller scales from observations by high-fre...
Article
The quasibiennial oscillation (QBO) of equatorial winds on Earth is the clearest example of the spontaneous emergence of a periodic phenomenon in geophysical fluids. In recent years, observations have revealed intriguing disruptions of this regular behavior, and different QBO-like regimes have been reported in a variety of systems. Here, we show th...
Article
Full-text available
A simple model for the deep-ocean overturning circulation is presented and applied to study the ocean’s response to a sudden surface warming. The model combines one-dimensional predictive residual advection–diffusion equations for the buoyancy in the basin and Southern Ocean surface mixed layer with diagnostic relationships for the residual overtur...
Article
Full-text available
Changes in deep-ocean circulation and stratification have been argued to contribute to climatic shifts between glacial and interglacial climates by affecting the atmospheric carbon dioxide concentrations. It has been recently proposed that such changes are associated with variations in Antarctic sea ice through two possible mechanisms: an increased...
Preprint
Full-text available
The quasi-biennial oscillation (QBO) of equatorial winds on Earth is the clearest example of the spontaneous emergence of a periodic phenomenon in geophysical fluids. In recent years, observations have revealed intriguing disruptions of this regular behaviour, and different QBO-like regimes have been reported in a variety of systems. Here we show t...
Article
Full-text available
Much of the existing theory for the ocean's overturning circulation considers steady-state equilibrium solutions. However, Earth's climate is not in a steady state, and a better understanding of the ocean's nonequilibrium response to changes in the surface climate is urgently needed. Here, the time-dependent response of the deep-ocean overturning c...
Poster
Full-text available
Much of the recent progress in understanding the ocean's kinetic energy pathways has been made using numerical simulations, while observations of these pathways remain sparse. The inverse cascade towards the large scales has been observed using satellite altimetry for scales larger than 200 km. There exists, however, few data sets that can be used...
Poster
Full-text available
The spectral analysis and the combination of radial currents into total currents are responsible for modifing the kinetic energy transfer at the largest and at a smallest scales.
Article
Zonally averaged models of the ocean overturning circulation miss important zonal exchanges of waters between the Atlantic and Indo-Pacific Oceans. A two-layer, two-basin model that accounts for these exchanges is introduced and suggests that in the present-day climate the overturning circulation is best described as the combination of three circul...
Poster
Full-text available
Input of kinetic energy by the winds in the ocean occurs at very large scales (order 1000 km), whereas dissipation of this energy occurs at very small scales (0.01 m). Understanding the complete pathways of energy from its input to its sink would be a milestone of physical oceanography. So far, energy transfer for scales larger than 100 km have bee...
Article
Full-text available
The deep-ocean circulation and stratification have likely undergone major changes during past climates, which may have played an important role in the modulation of atmospheric CO2 concentrations. The mechanisms by which the deep-ocean circulation changed, however, are still poorly understood and represent a major challenge to the understanding of...
Article
Full-text available
We investigate the effects of sea surface temperature (SST)-dependent wind stress on the wind-driven quasigeostrophic (QG) double gyre. The main effects are to reduce the strength of the circulation and to shift the inter-gyre jet to the south. The SST front across the inter-gyre jet induces a zonal wind stress anomaly over the jet that accelerates...
Poster
Full-text available
The estimation of kinetic energy spectral fluxes can be calculated using several methods.
Article
Full-text available
The interaction between an Antarctic Circumpolar Current-like channel flow and a continental shelf break is considered using eddy-permitting simulations of a quasigeostrophic and a primitive equation model. The experimental setup is motivated by the continental shelf of the West Antarctic Peninsula. Numerical experiments are performed to study how...
Article
Full-text available
Eddy-permitting simulations are used to show that basinlike gyres can be observed in the large-scale barotropic flow of a wind-driven channel with a meridional topographic ridge. This is confirmed using both two-layer quasigeostrophic and 25-level primitive equation models at high horizontal resolution. Comparing results from simulations with and w...
Article
Full-text available
We investigate the non-linear equilibration of a two-layer quasi-geostrophic flow in a channel with an initial eastward baroclinically unstable jet in the upper layer, paying particular attention to the role of bottom friction. In the limit of low bottom friction, classical theory of geostrophic turbulence predicts an inverse cascade of kinetic ene...
Article
Full-text available
This paper investigates the energy budget of mesoscale eddies in wind-driven two-layer quasigeostrophic simulations. Intuitively, eddy energy can be generated, dissipated, and fluxed from place to place; regions where the budget balances generation and dissipation are local and regions that export or import large amounts of eddy energy are nonlocal...
Article
Full-text available
The circumpolar transport of a wind-driven quasigeostrophic Antarctic Circumpolar Current is considered. Simple theory suggests transport in a strongly forced regime-the focus of this study-is largely determined by a partitioning of the southward Sverdrup flux into Drake Passage latitudes: some streamlines feed a ''basin contribution'' to the circu...
Article
Eddy-permitting simulations of a wind-driven quasigeostrophic model in an idealized Southern Ocean setting are used to attempt to describe what sets the wind-driven circumpolar transport of the Antarctic Circumpolar Current (ACC). For weak forcing, the transport is well described as a linear sum of channel and basin components. The authors’ main fo...
Article
Full-text available
The idea that basinlike dynamics may play a major role in determining the Antarctic Circumpolar Current (ACC) transport is revisited. A simple analytic model is developed to describe the relationship between the wind stress and transport. At very low-wind stress, a nonzero minimum is predicted. This is followed by two distinct dynamical regimes for...
Article
Full-text available
We discuss how the concept of the quantum action can be used to characterize quantum chaos. As an example we study quantum mechanics of the inverse square potential in order to test some questions related to quantum action. Quantum chaos is discussed for the 2-D hamiltonian system of harmonic oscillators with anharmonic coupling.
Article
Full-text available
We consider a mixed chaotic Hamiltonian system and compare classical with quantum chaos. As alternative to the methods of enegy level spacing statistics and trace formulas, we construct a quantum action and a quantum analogue phase space to analyse quantum chaos.
Article
Full-text available
We investigate chaotic behavior in a 2-D Hamiltonian system - oscillators with anharmonic coupling. We compare the classical system with quantum system. Via the quantum action, we construct Poincar\'e sections and compute Lyapunov exponents for the quantum system. We find that the quantum system is globally less chaotic than the classical system. W...
Article
We investigate chaotic behavior in a 2D Hamiltonian system—oscillators with anharmonic coupling. We compare the classical system with quantum system. Via the quantum action, we construct Poincaré sections and compute Lyapunov exponents for the quantum system. We find that the quantum system is globally less chaotic than the classical system. We als...
Article
Full-text available
We present a numerical study of the quantum action previously introduced as a parametrisation of Q.M. transition amplitudes. We address the questions: Is the quantum action possibly an exact parametrisation in the whole range of transition times ($0 < T < \infty$)? Is the presence of potential terms beyond those occuring in the classical potential...
Article
The idea that basin-like dynamics may influence or control the Antarctic Circumpolar Current (ACC) is investigated with idealized analytic and numerical models. A simple 2-layer analytic model is developed to predict the transport evolution with the wind stress amplitude. At very low forcing, a non-zero minimum is predicted. This is followed by two...

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