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2.0

Jun 29, 2018
06/18

by
Omer San

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A single-layer, quasi-geostrophic (QG), large-scale ocean circulation model is developed in this paper to study available ocean current energy potentials harnessed by using the ocean current turbines. Power extraction is modeled by adding a parameterized Rayleigh friction term in the barotropic vorticity equation. Numerical assessments are performed by simulating a set of mid-latitude ocean basins in the beta plane, which are standard prototypes of more realistic ocean dynamics considering...

Topics: Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1604.08486

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Jun 29, 2018
06/18

by
Andrea A. Cimatoribus; Hans van Haren

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The relation between the flux of temperature (or buoyancy), the vertical temperature gradient and the height above the bottom, is investigated in an oceanographic context, using high-resolution temperature measurements. The model for the evolution of a stratified layer by Balmforth et al. (1998) is reviewed and adapted to the case of a turbulent flow above a wall. Model predictions are compared to the average observational estimates of the flux, exploiting a flux estimation method proposed by...

Topics: Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1602.02599

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Jun 29, 2018
06/18

by
Yantao Yang; Roberto Verzicco; Detlef Lohse

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Vertically bounded fingering double diffusive convection (DDC) is numerically investigated, focusing on the influences of different velocity boundary conditions, i.e. the no-slip condition which is inevitable in the lab-scale experimental research, and the free-slip condition which is an approximation for the interfaces in many natural environments, such as the oceans. For both boundary conditions the flow is dominated by fingers and the global responses follow the same scaling laws, with...

Topics: Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1602.07718

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Jun 29, 2018
06/18

by
D. L. Suhas; Jai Sukhatme

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Quasigeostrophic turbulence on a beta-plane with a finite deformation radius is studied nu- merically, with particular emphasis on frequency and combined wavenumber-frequency do- main analyses. Under suitable conditions, simulations with small-scale random forcing and large-scale drag exhibit a spontaneous formation of multiple zonal jets. The first hint of wave-like features is seen in the distribution of kinetic energy as a function of frequency; specifically, for progressively larger...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1604.01877

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Jun 29, 2018
06/18

by
Ding Ma; Pedram Hassanzadeh; Zhiming Kuang

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A linear response function (LRF) that relates the temporal tendency of zonal mean temperature and zonal wind to their anomalies and external forcing is used to accurately quantify the strength of the eddy-jet feedback associated with the annular mode in an idealized GCM. Following a simple feedback model, the results confirm the presence of a positive eddy-jet feedback in the annular mode dynamics, with a feedback strength of 0.137 day$^{-1}$ in the idealized GCM. Statistical methods proposed...

Topics: Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1608.04130

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Jun 29, 2018
06/18

by
Joseph G. Fitzgerald; Brian F. Farrell

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Stratified turbulence is characterized by strong anisotropy and a red energy spectrum. Moreover, in many cases the energetic large scales consist of coherent horizontal structures such as vertically sheared horizontal flows, also called stacked jets. Examples of such jets in stratified geophysical flows include the equatorial deep jets in the oceans and the quasi-biennial oscillation in the stratosphere. The mechanism responsible for the formation and maintenance of these jets in stratified...

Topics: Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1612.03243

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Jun 29, 2018
06/18

by
Julian Mak; James R. Maddison; David P. Marshall; Scott D. Bachman

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The large-scale features of the global ocean circulation and the sensitivity of these features with respect to forcing changes are critically dependent upon the influence of the mesoscale eddy field. One such feature, observed in numerical simulations whereby the mesoscale eddy field is at least partially resolved, is the phenomenon of eddy saturation, where the time-mean circumpolar transport of the Antarctic Circumpolar Current displays relative insensitivity to wind forcing changes....

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1610.00621

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Jun 29, 2018
06/18

by
Eric Danioux; Jacques Vanneste

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The impact of a turbulent flow on wind-driven oceanic near-inertial waves is examined using a linearised shallow-water model of the mixed layer. Modelling the flow as a homogeneous and stationary random process with spatial scales comparable to the wavelengths, we derive a transport (or kinetic) equation governing wave-energy transfers in both physical and spectral spaces. This equation describes the scattering of the waves by the flow which results in a redistribution of energy between waves...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1601.05456

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Jun 29, 2018
06/18

by
Christophe Brouzet; Evgeny Ermanyuk; Sylvain Joubaud; Ilias Sibgatullin; Thierry Dauxois

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One of the pivotal questions in the dynamics of the oceans is related to the cascade of mechanical energy in the abyss and its contribution to mixing. Here, we propose internal wave attractors in the large amplitude regime as a unique self-consistent experimental and numerical setup that models a cascade of triadic interactions transferring energy from large-scale monochro-matic input to multi-scale internal wave motion. We also provide signatures of a discrete wave turbulence framework for...

Topics: Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1602.06852

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Jun 29, 2018
06/18

by
Vassilios Dallas; Steve Tobias

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The effects of large scale mechanical forcing on the dynamics of rotating turbulent flows are studied by means of numerical simulations, varying systematically the nature of the mechanical force in time. We demonstrate that the statistically stationary solutions of these flows depend on the nature of the forcing mechanism. Rapidly enough rotating flows with a forcing that has a persistent direction relatively to the axis of rotation bifurcate from a non-helical state to a helical state despite...

Topics: Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1601.04310

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0.0

Jun 29, 2018
06/18

by
V. P. Ruban

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The numerical simulation of the nonlinear dynamics of random sea waves at moderately small Benjamin-Feir indices and its comparison with the linear dynamics (at the coincidence of spatial Fourier harmonics near a spectral peak at a certain time $t_p$) indicate that the appearance of a rogue wave can be predicted in advance. If the linear approximation shows the presence of a sufficiently extensive and/or high group of waves in the near future after $t_p$, an anomalous wave is almost necessarily...

Topics: Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1609.00500

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1.0

Jun 29, 2018
06/18

by
Joy M. Monteiro; Jai Sukhatme

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The derivation of a quasi-geostrophic (QG) system from the rotating shallow water equations on a midlatitude beta-plane coupled with moisture is presented. Condensation is prescribed to occur whenever the moisture at a point exceeds a prescribed saturation value. It is seen that a slow condensation time scale is required to obtain a consistent set of equations at leading order. Further, since the advecting wind fields are geostrophic, changes in moisture (and hence, precipitation) occur only...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1604.03656

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1.0

Jun 29, 2018
06/18

by
Suhas DL; Jai Sukhatme; Joy M. Monteiro

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The response of the nonlinear shallow water equations (SWE) on a sphere to tropical vorticity forcing is examined with an emphasis on momentum fluxes and the emergence of a superrotating (SR) state. Fixing the radiative damping and momentum drag timescales to be of the order of a few days, a state of SR is shown to emerge under steady large-scale and random small-scale vorticity forcing. In the first example, the stationary response to a pair of equal and oppositely signed vortices placed on...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1612.01719

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Jun 29, 2018
06/18

by
Grigoris Katsiolides; Eike H. Müller; Robert Scheichl; Tony Shardlow; Michael B. Giles; David J. Thomson

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A common way to simulate the transport and spread of pollutants in the atmosphere is via stochastic Lagrangian dispersion models. Mathematically, these models describe turbulent transport processes with stochastic differential equations (SDEs). The computational bottleneck is the Monte Carlo algorithm, which simulates the motion of a large number of model particles in a turbulent velocity field; for each particle, a trajectory is calculated with a numerical timestepping method. Choosing an...

Topics: Physics, Numerical Analysis, Fluid Dynamics, Atmospheric and Oceanic Physics, Mathematics

Source: http://arxiv.org/abs/1612.07717

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2.0

Jun 29, 2018
06/18

by
Arthur P. Guillaumin; Adam M. Sykulski; Sofia C. Olhede; Jeffrey J. Early; Jonathan M. Lilly

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We propose a new class of univariate nonstationary time series models, using the framework of modulated time series, which is appropriate for the analysis of rapidly-evolving time series as well as time series observations with missing data. We extend our techniques to a class of bivariate time series that are isotropic. Exact inference is often not computationally viable for time series analysis, and so we propose an estimation method based on the Whittle-likelihood, a commonly adopted...

Topics: Methodology, Fluid Dynamics, Atmospheric and Oceanic Physics, Applications, Physics, Statistics

Source: http://arxiv.org/abs/1605.09107

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1.0

Jun 29, 2018
06/18

by
Denys Dutykh; Didier Clamond; Marx Chhay

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This manuscript is devoted to the modelling of water waves in the deep water regime with some emphasis on the underlying variational structures. The present article should be considered as a review of some existing models and modelling approaches even if new results are presented as well. Namely, we derive the deep water analogue of the celebrated Serre-Green-Naghdi equations which have become the standard model in shallow water environments. The relation to existing models is discussed....

Topics: Classical Physics, Fluid Dynamics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1607.00216

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Jun 29, 2018
06/18

by
Pascal Marquet

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This paper describes Comments to the paper of Mrowiec et al. published in the J. Atmos. Sci. in May 2016 (Vol 73, Issue 5, pages 1857-1870) and entitled "Isentropic analysis of a simulated hurricane". It is explained that the plotting of isentropic surfaces (namely the isentropes) requires a precise definition of the specific moist-air entropy, and that most of existing "equivalent potential temperatures" lead to inaccurate definitions of isentropes. It is shown that the use...

Topics: Geophysics, Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1607.04308

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0.0

Jun 29, 2018
06/18

by
Cihan Bayindir

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In this paper we propose an extended Kundu-Eckhaus equation (KEE) for modeling the dynamics of skewed rogue waves emerging in the vicinity of a wave blocking point due to opposing current. The equation we propose is a KEE with an additional potential term therefore the results presented in this paper can easily be generalized to study the quantum tunneling properties of the rogue waves and ultrashort (femtosecond) pulses of the KEE. In the frame of the extended KEE, we numerically show that the...

Topics: Fluid Dynamics, Quantum Physics, Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1602.05339

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Jun 29, 2018
06/18

by
Y. Wang; F. J. Beron-Vera; M. J. Olascoaga

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We document the long-term evolution of an Agulhas ring detected from satellite altimetry using a technique from nonlinear dynamical systems that enables objective (i.e., observer-independent) eddy framing. Such objectively detected eddies have Lagrangian (material) boundaries that remain coherent (unfilamented) over the detection period. The ring preserves a quite compact material entity for a period of about 2 years even after most initial coherence is lost within 5 months after detection. We...

Topics: Plasma Physics, Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1601.01560

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Jun 29, 2018
06/18

by
Pascal Marquet

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The aim of this note is to derive the mixed-phase version of the moist-air entropy potential temperature $\theta_s$ derived in Marquet (2011). This mixed-phase version is suitable to describe parcels where liquid water and ice are allowed to coexist, with possible under- or super-saturations, with possible supercooled water and with possible different temperatures for dry air and water vapour, on the one hand, condensed water and ice, on the other hand. The impact of this new mixed-phase...

Topics: Geophysics, Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1605.04382

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1.0

Jun 29, 2018
06/18

by
J. B. Marston; G. P. Chini; S. M. Tobias

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Quasilinear theory is often utilized to approximate the dynamics of fluids exhibiting significant interactions between mean flows and eddies. In this paper we present a generalization of quasilinear theory to include dynamic mode interactions on the large scales. This generalized quasilinear (GQL) approximation is achieved by separating the state variables into large and small zonal scales via a spectral filter rather than by a decomposition into a formal mean and fluctuations. Nonlinear...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Solar and Stellar Astrophysics, Physics, Earth and...

Source: http://arxiv.org/abs/1601.06720

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Jun 29, 2018
06/18

by
A. Bershadskii

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It is shown, using results of recent direct numerical simulations, laboratory experiments and atmospheric measurements, that buoyancy driven turbulence exhibits a broad diversity of the types of distributed chaos with its stretched exponential spectrum $\exp(-k/k_{\beta})^{\beta}$. The distributed chaos with $\beta = 1/3$ (determined by the helicity correlation integral) is the most common feature of the stably stratified turbulence (due to the strong helical waves presence). These waves mostly...

Topics: Astrophysics, Fluid Dynamics, Solar and Stellar Astrophysics, Physics, Atmospheric and Oceanic...

Source: http://arxiv.org/abs/1608.00489

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0.0

Jun 29, 2018
06/18

by
V. P. Ruban

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The numerical simulation of the nonlinear dynamics of the sea surface has shown that the collision of two groups of relatively low waves with close but noncollinear wave vectors (two or three waves in each group with a steepness of about 0.2) can result in the appearance of an individual anomalous wave whose height is noticeably larger than that in the linear theory. Since such collisions quite often occur on the ocean surface, this scenario of the formation of rogue waves is apparently most...

Topics: Pattern Formation and Solitons, Fluid Dynamics, Nonlinear Sciences, Physics, Atmospheric and...

Source: http://arxiv.org/abs/1602.03753

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1.0

Jun 29, 2018
06/18

by
Aseel Farhat; Evelyn Lunasin; Edriss S. Titi

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Analyzing the validity and success of a data assimilation algorithm when some state variable observations are not available is an important problem in meteorology and engineering. We present an improved data assimilation algorithm for recovering the exact full reference solution (i.e. the velocity and temperature) of the 3D Planetary Geostrophic model, at an exponential rate in time, by employing coarse spatial mesh observations of the temperature alone. This provides, in the case of this...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Analysis of PDEs, Physics, Mathematics, Geophysics

Source: http://arxiv.org/abs/1608.04770

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1.0

Jun 29, 2018
06/18

by
Chongsheng Cao; Jinkai Li; Edriss S. Titi

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In this paper, we consider the initial-boundary value problem of the three-dimensional primitive equations for oceanic and atmospheric dynamics with only horizontal viscosity and horizontal diffusivity. We establish the local, in time, well-posedness of strong solutions, for any initial data $(v_0, T_0)\in H^1$, by using the local, in space, type energy estimate. We also establish the global well-posedness of strong solutions for this system, with any initial data $(v_0, T_0)\in H^1\cap...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Analysis of PDEs, Physics, Mathematics, Geophysics

Source: http://arxiv.org/abs/1607.06252

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Jun 29, 2018
06/18

by
Pedram Hassanzadeh; Zhiming Kuang

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A linear response function (LRF) relates the mean-response of a nonlinear system to weak external forcings and vice versa. Even for simple models of the general circulation, such as the dry dynamical core, the LRF cannot be calculated from first principles due to the lack of a complete theory for eddy-mean flow feedbacks. According to the Fluctuation-Dissipation Theorem (FDT), the LRF can be calculated using only the covariance and lag-covariance matrices of the unforced system. However,...

Topics: Fluid Dynamics, Nonlinear Sciences, Atmospheric and Oceanic Physics, Data Analysis, Statistics and...

Source: http://arxiv.org/abs/1603.08807

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0.0

Jun 29, 2018
06/18

by
Cihan Bayindir

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We discuss the possible usage of the compressive sampling for the early detection of rogue waves. One of the promising techniques for the early detection of the oceanic rogue waves is to measure the triangular Fourier spectra which begin to appear at the early stages of their development. For the early detection of the rogue waves it is possible to treat such a spectrum as a sparse signal since we would mainly be interested in the high amplitude triangular region located at the central...

Topics: Fluid Dynamics, Nonlinear Sciences, Atmospheric and Oceanic Physics, Physics, Chaotic Dynamics,...

Source: http://arxiv.org/abs/1602.00816

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4.0

Jun 29, 2018
06/18

by
David Lannes

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This paper addresses the floating body problem which consists in studying the interaction of surface water waves with a floating body. We propose a new formulation of the water waves problem that can easily be generalized in order to take into account the presence of a floating body. The resulting equations have a compressible-incompressible structure in which the interior pressure exerted by the fluid on the floating body is a Lagrange multiplier that can be determined through the resolution...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Analysis of PDEs, Numerical Analysis, Physics,...

Source: http://arxiv.org/abs/1609.06136

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Jun 29, 2018
06/18

by
Ch. Helling; G. Lee; I. Dobbs-Dixon; N. Mayne; D. S. Amundsen; J. Khaimova; A. A. Unger; J. Manners; D. Acreman; C. Smith

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3D atmosphere model results are used to comparatively study the kinetic, non-equilibrium cloud formation in the atmospheres of two example planets guided by the giant gas planets HD209458b and HD189733b. Rather independently of hydrodynamic model differences, our cloud modelling suggests that both planets are covered in mineral clouds throughout the entire modelling domain. Both planets harbour chemically complex clouds that are made of mineral particles that have a height-dependent material...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Solar and Stellar Astrophysics, Physics, Earth and...

Source: http://arxiv.org/abs/1603.04022

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2.0

Jun 29, 2018
06/18

by
Jinkai Li; Edriss S. Titi

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This paper is devoted to reviewing several recent developments concerning certain class of geophysical models, including the primitive equations (PEs) of atmospheric and oceanic dynamics and a tropical atmosphere model. The PEs for large-scale oceanic and atmospheric dynamics are derived from the Navier-Stokes equations coupled to the heat convection by adopting the Boussinesq and hydrostatic approximations, while the tropical atmosphere model considered here is a nonlinear interaction system...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Analysis of PDEs, Physics, Mathematics, Geophysics

Source: http://arxiv.org/abs/1604.01695

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1.0

Jun 29, 2018
06/18

by
Cihan Bayindir

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In this paper we study the properties of the chaotic wave fields generated in the frame of the Kundu-Eckhaus equation (KEE). Modulation instability results in a chaotic wave field which exhibits small-scale filaments with a free propagation constant, k. The average velocity of the filaments is approximately given by the average group velocity calculated from the dispersion relation for the plane-wave solution however direction of propagation is controlled by the $\beta$ parameter, the constant...

Topics: Fluid Dynamics, Nonlinear Sciences, Atmospheric and Oceanic Physics, Physics, Chaotic Dynamics,...

Source: http://arxiv.org/abs/1601.00209

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Jun 29, 2018
06/18

by
Cihan A. Bayindir

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In this paper we analyze the rogue wave spectra of the Kundu-Eckhaus equation (KEE). We compare our findings with their nonlinear Schrodinger equation (NLSE) analogs and show that the spectra of the individual rogue waves significantly differ from their NLSE analogs. A remarkable difference is the one-sided development of the triangular spectrum before the rogue wave becomes evident in time. Also we show that increasing the skewness of the rogue wave results in increased asymmetry in the...

Topics: Nonlinear Sciences, Fluid Dynamics, Atmospheric and Oceanic Physics, Physics, Pattern Formation and...

Source: http://arxiv.org/abs/1604.08035

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Jun 29, 2018
06/18

by
Sabine Hittmeir; Rupert Klein; Jinkai Li; Edriss S. Titi

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We study a moisture model for warm clouds that has been used by Klein and Majda as a basis for multiscale asymptotic expansions for deep convective phenomena. These moisture balance equations correspond to a bulk microphysics closure in the spirit of Kessler and of Grabowski and Smolarkiewicz, in which water is present in the gaseous state as water vapor and in the liquid phase as cloud water and rain water. It thereby contains closures for the phase changes condensation and evaporation, as...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Analysis of PDEs, Physics, Mathematics, Geophysics

Source: http://arxiv.org/abs/1610.00060

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Jun 29, 2018
06/18

by
Liubov Tupikina; Nora Molkenthin; Cristóbal López; Emilio Hernández-García; Norbert Marwan; Jürgen Kurths

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Complex network theory provides an elegant and powerful framework to statistically investigate different types of systems such as society, brain or the structure of local and long-range dynamical interrelationships in the climate system. Network links in climate networks typically imply information, mass or energy exchange. However, the specific connection between oceanic or atmospheric flows and the climate network's structure is still unclear. We propose a theoretical approach for verifying...

Topics: Atmospheric and Oceanic Physics, Fluid Dynamics, Chaotic Dynamics, Physics, Nonlinear Sciences

Source: http://arxiv.org/abs/1604.04922

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Jun 29, 2018
06/18

by
Inna Polichtchouk; James Y-K. Cho

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Equatorial superrotation under zonally-symmetric thermal forcing is investigated in a setup close to that of the classic Held & Suarez (1994) setup. In contrast to the behaviour in the classic setup, a transition to equatorial superrotation occurs when the equator-to-pole surface equilibrium entropy gradient is weakened. Two factors contribute to this transition: 1) the reduction of breaking Rossby waves from the mid-latitude that decelerate the equatorial flow and 2) the presence of...

Topics: Earth and Planetary Astrophysics, Astrophysics, Fluid Dynamics, Atmospheric and Oceanic Physics,...

Source: http://arxiv.org/abs/1603.04218

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Jun 29, 2018
06/18

by
F Bouchet; Antoine Venaille

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Zonal jets are striking and beautiful examples of the propensity for geophysical turbulent flows to spontaneously self-organize into robust, large scale coherent structures. There exist many dynamical mechanisms for the formation of zonal jets: statistical theories (kinetic approaches, second order or larger oder closures), deterministic approaches (modulational instability, $\beta$-plumes, radiating instability, zonostrophic turbulence, and so on). A striking remark is that all these different...

Topics: Atmospheric and Oceanic Physics, Fluid Dynamics, Statistical Mechanics, Physics, Condensed Matter

Source: http://arxiv.org/abs/1602.06714

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Jun 29, 2018
06/18

by
Darren Engwirda; Maxwell Kelley

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A new, high-order slope-limiting procedure for the Piecewise Parabolic Method (PPM) and the Piecewise Quartic Method (PQM) is described. Following a Weighted Essentially Non-Oscillatory (WENO)-type paradigm, the proposed slope-limiter seeks to reconstruct smooth, non-oscillatory piecewise polynomial profiles as a non-linear combination of the natural and monotone-limited PPM and PQM interpolants. Compared to existing monotone slope-limiting techniques, this new strategy is designed to improve...

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Computational Physics, Numerical Analysis,...

Source: http://arxiv.org/abs/1606.08188

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Jun 29, 2018
06/18

by
Bruno Issenmann; Claude Laroche; Eric Falcon

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We experimentally study gravity-capillary wave turbulence on the interface between two immiscible fluids of close density with free upper surface. We locally measure the wave height at the interface between both fluids by means of a highly sensitive laser Doppler vibrometer. We show that the inertial range of the capillary wave turbulence regime is significantly extended when the upper fluid depth is increased: The crossover frequency between the gravity and capillary wave turbulence regimes is...

Topics: Fluid Dynamics, Nonlinear Sciences, Atmospheric and Oceanic Physics, Physics, Classical Physics,...

Source: http://arxiv.org/abs/1610.05899

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Jun 29, 2018
06/18

by
L. De Cruz; J. Demaeyer; S. Vannitsem

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This paper describes a reduced-order quasi-geostrophic coupled ocean-atmosphere model that allows for an arbitrary number of atmospheric and oceanic modes to be retained in the spectral decomposition. The modularity of this new model allows one to easily modify the model physics. Using this new model, coined "Modular Arbitrary-Order Ocean-Atmosphere Model" (maooam), we analyse the dependence of the model dynamics on the truncation level of the spectral expansion, and unveil spurious...

Topics: Fluid Dynamics, Chaotic Dynamics, Nonlinear Sciences, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1603.06755

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Jun 29, 2018
06/18

by
Anna Frishman; Jason Laurie; Gregory Falkovich

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An inverse cascade - energy transfer to progressively larger scales - is a salient feature of two-dimensional turbulence. If the cascade reaches the system scale, it creates a coherent flow expected to have the largest available scale and conform with the symmetries of the domain. In a doubly periodic rectangle, the mean flow with zero total momentum was therefore believed to be unidirectional, with two jets along the short side; while for an aspect ratio close to unity, a vortex dipole was...

Topics: Nonlinear Sciences, Fluid Dynamics, Atmospheric and Oceanic Physics, Statistical Mechanics,...

Source: http://arxiv.org/abs/1608.04628