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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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Jun 29, 2018
06/18

by
A. E. Kuchma; A. K. Shchekin; D. S. Martyukova

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A new comprehensive analysis of Stefan's flow caused by a free growing droplet in vapor-gas atmosphere with several condensing components is presented. This analysis, based on the nonstationary heat and material balance and diffusion transport equations, shows the appearance of the Stefan inflow in the vicinity of the growing droplet and the outflow at large distances from the droplet as a consequence of nonisothermal condensation. For an ensemble of droplets in the atmospheric cloud, this flow...

Topics: Soft Condensed Matter, Chemical Physics, Condensed Matter, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1606.02086

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Jun 29, 2018
06/18

by
A. L. Virovlyansky

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A method is proposed for finding the wave field components which are weakly sensitive to the sound speed perturbation in the ocean acoustic waveguides. Such a component is formed by a narrow beam of rays whose spread in vertical direction, up to the observation range, remains less than the vertical scale of perturbation. These rays pass through practically the same inhomogeneities and therefore their phases acquire close increments. If the ray amplitudes vary insignificantly, then (i) the...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1610.02568

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Jun 29, 2018
06/18

by
Adrean Webb; Takuji Waseda; Wataru Fujimoto; Kazutoshi Horiuchi; Keiji Kiyomatsu; Kazuhiro Matsuda; Yasumasa Miyazawa; Sergey Varlamov; Jun Yoshikawa

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The University of Tokyo and JAMSTEC have conducted state-of-the-art wave and current resource assessments to assist with generator site identification and construction in Japan. These assessments are publicly-available and accessible via a web GIS service designed by WebBrain that utilizes TDS and GeoServer software with Leaflet libraries. The web GIS dataset contains statistical analyses of wave power, ocean and tidal current power, ocean temperature power, and other basic physical variables....

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1607.02251

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Jun 29, 2018
06/18

by
Alessio Turchi; Elena Masciadri; Luca Fini

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In this paper we study the abilities of an atmospherical mesoscale model in forecasting the classical atmospherical parameters relevant for astronomical applications at the surface layer (wind speed, wind direction, temperature, relative humidity) on the Large Binocular Telescope (LBT) site - Mount Graham, Arizona. The study is carried out in the framework of the ALTA project aiming at implementing an automated system for the forecasts of atmospherical parameters (Meso-Nh code) and the optical...

Topics: Astrophysics, Instrumentation and Methods for Astrophysics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1609.00237

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Jun 29, 2018
06/18

by
Alexander M. R. Bakker; Tony E. Wong; Kelsey L. Ruckert; Klaus Keller

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Future sea-level rise poses nontrivial risks for many coastal communities. Managing these risks often relies on consensus projections like those provided by the IPCC. Yet, there is a growing awareness that the surrounding uncertainties may be much larger than typically perceived. Recently published sea-level projections appear widely divergent and highly sensitive to non-trivial model choices and the West Antarctic Ice Sheet (WAIS) may be much less stable than previously believed, enabling a...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1609.07119

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1.0

Jun 29, 2018
06/18

by
Aleš Berkopec

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Cloud-to-ground lightning is the most common among atmospheric discharges. Since electric fields in the vicinity of a thunder-cloud do not exceed 250 kV/m the physical process that triggers the lightning remains unexplained. [1, 2, 3] Recent measurements established a weak correlation between solar wind and incidence of lightning. [4] Here we show, that if an ionized path created by cosmic rays provides a trigger, the distribution of lengths between two successive forking points in a lightning...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1602.02496

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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
Andrea Natale; Jemma Shipton; Colin J. Cotter

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Compatible finite elements provide a framework for preserving important structures in equations of geophysical fluid dynamics, and are becoming important in their use for building atmosphere and ocean models. We survey the application of compatible finite element spaces to geophysical fluid dynamics, including the application to the nonlinear rotating shallow water equations, and the three-dimensional compressible Euler equations. We summarise analytic results about dispersion relations and...

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

Source: http://arxiv.org/abs/1605.00551

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Jun 29, 2018
06/18

by
Ankush Bhaskar; Durbha Sai Ramesh; Geeta Vichare; Triven Koganti; S. Gurubaran

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Identification and quantification of possible drivers of recent climate variability remain a challenging task. This important issue is addressed adopting a non-parametric information theory technique, the Transfer Entropy and its normalized variant. It distinctly quantifies actual information exchanged along with the directional flow of information between any two variables with no bearing on their common history or inputs, unlike correlation, mutual information etc. Measurements of greenhouse...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1607.01529

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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

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2.0

Jun 29, 2018
06/18

by
Anna S. von der Heydt; Peter Ashwin

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Equilibrium climate sensitivity (ECS) is a key predictor of climate change. However, it is not very well constrained, either by climate models or by observational data. The reasons for this include strong internal variability and forcing on many time scales. In practise this means that the 'equilibrium' will only be relative to fixing the slow feedback processes before comparing palaeoclimate sensitivity estimates with estimates from model simulations. In addition, information from the late...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1604.03311

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Jun 29, 2018
06/18

by
Anton Bezuglov; Brian Blanton; Reinaldo Santiago

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During hurricane seasons, emergency managers and other decision makers need accurate and `on-time' information on potential storm surge impacts. Fully dynamical computer models, such as the ADCIRC tide, storm surge, and wind-wave model take several hours to complete a forecast when configured at high spatial resolution. Additionally, statically meaningful ensembles of high-resolution models (needed for uncertainty estimation) cannot easily be computed in near real-time. This paper discusses an...

Topics: Atmospheric and Oceanic Physics, Applications, Physics, Statistics, Neural and Evolutionary...

Source: http://arxiv.org/abs/1609.07378

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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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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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Jun 29, 2018
06/18

by
B. K. Sahoo; Madhulita Das

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The effect of plasma environment on the atomic energy levels of He-like and Li-like Mg and Fe ions have been studied using Debye model. The equation-of-motion coupled-cluster (EOMCC) and Fock-space coupled-cluster (FSCC) formalisms in the relativistic frame work have been adopted to describe the atomic states and the energy levels of the above plasma embedded ions. Salient features of these methods have been described to account the two electron screening effects through the Debye potentials....

Topics: Atmospheric and Oceanic Physics, Atomic Physics, Solar and Stellar Astrophysics, Physics,...

Source: http://arxiv.org/abs/1608.07919

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Jun 29, 2018
06/18

by
Bijan Fallah; Abbas Ali Saberi; Sahar Sodoudi

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Scale invariance property in the global geometry of Earth may lead to a coupled interactive behaviour between various components of the climate system. One of the most interesting correlations exists between spatial statistics of the global topography and the temperature on Earth. Here we show that the power-law behaviour observed in the Earth topography via different approaches, resembles a scaling law in the global spatial distribution of independent atmospheric parameters. We report on...

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

Source: http://arxiv.org/abs/1609.08926

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Jun 29, 2018
06/18

by
Bo You; Fang Li

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This paper is concerned with the long-time behavior of solutions for the three dimensional primitive equations of large-scale ocean and atmosphere dynamics in an unbounded domain. Since the Sobolev embedding is no longer compact in an unbounded domain, we cannot obtain the asymptotical compactness of the semigroup generated by problem (2.4)-(2.6) by the Sobolev compactness embedding theorem even if we obtain the existence of an absorbing set in more regular phase space. To overcome this...

Topics: Physics, Analysis of PDEs, Mathematical Physics, Atmospheric and Oceanic Physics, Mathematics

Source: http://arxiv.org/abs/1612.02679

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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
Cecilia F. Mondaini; Edriss S. Titi

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We apply the Postprocessing Galerkin method to a recently introduced continuous data assimilation (downscaling) algorithm for obtaining a numerical approximation of the solution of the two-dimensional Navier-Stokes equations corresponding to given measurements from a coarse spatial mesh. Under suitable conditions on the relaxation (nudging) parameter, the resolution of the coarse spatial mesh and the resolution of the numerical scheme, we obtain uniform in time estimates for the error between...

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

Source: http://arxiv.org/abs/1612.06998

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Jun 29, 2018
06/18

by
Ch. Helling; P. B. Rimmer; I. M. Rodriguez-Barrera; Kenneth Wood; G. B. Robertson; C. R. Stark

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Brown dwarfs and giant gas extrasolar planets have cold atmospheres with a rich chemical compositions from which mineral cloud particles form. Their properties, like particle sizes and material composition, vary with height, and the mineral cloud particles are charged due to triboelectric processes in such dynamic atmospheres. The dynamics of the atmospheric gas is driven by the irradiating host star and/or by the rotation of the objects that changes during its lifetime. Thermal gas ionisation...

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

Source: http://arxiv.org/abs/1604.03369

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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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Jun 29, 2018
06/18

by
Ch. Helling; R. G. Harrison; F. Honary; D. A. Diver; K. Aplin; I. Dobbs-Dixon; U. Ebert; S. Inutsuka; F. J. Gordillo-Vazquez; S. Littlefair

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Detailed observations of the solar system planets reveal a wide variety of local atmospheric conditions. Astronomical observations have revealed a variety of extrasolar planets none of which resembles any of the solar system planets in full. Instead, the most massive amongst the extrasolar planets, the gas giants, appear very similar to the class of (young) Brown Dwarfs which are amongst the oldest objects in the universe. Despite of this diversity, solar system planets, extrasolar planets and...

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

Source: http://arxiv.org/abs/1601.04594

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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
Christine Kazantsev; Eugene Kazantsev; Mikhail Tolstykh

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The review describes the development of ideas Gury Ivanovich Marchuk in the field of variational data assimilation for ocean models applied in particular in coupled models for long-range weather forecasts. Particular attention is paid to the optimization of boundary conditions on rigid boundaries. As idealized and realistic model configurations are considered. It is shown that the optimization allows us to determine the most sensitive model operators and bring the model solution closer to the...

Topics: Optimization and Control, Mathematics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1601.01193

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1.0

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
Christopher C. Chapman

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The frontal structure of the Southern Ocean is investigated using a sophisticated frontal detection methodology, the Wavelet/Higher Order Statistics Enhancement (WHOSE) method, introduced in \cite{Chapman2014}. This methodology is applied to 21 years of daily gridded sea-surface height (SSH) data to obtain daily maps of the locations of the fronts. By forming `heat-maps' of the frontal occurrence frequency and then approximating these heat-maps by a superposition of simple functions, the...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1609.09616

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Jun 29, 2018
06/18

by
Christopher C. Chapman; Jean-Baptiste Sallée

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The Meridional Overturning Circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite observations of sea-surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy-diffusivity in the Southern Ocean is obtained using the theory of Ferrari & Nikurashin (2010), that includes the influence of suppression of the diffusivity by the strong, time-mean flows. It is found that the eddy diffusivity is enhanced at...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1612.01115

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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
Cihan Bayindir; J. David Frost; Christopher F. Barnes

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In this study the detection of the oil spill using synthetic aperture radar (SAR) imagery is considered. Detection of the oil spill is performed using change detection algorithms between imagery acquired at different times. The specific algorithms used are the correlation coefficient change statistic and the intensity ratio change statistic algorithms. Therefore these algorithms and the probabilistic selection of the threshold criteria is reviewed and discussed. A recently offered change...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1604.00625

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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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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
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
Colin Goldblatt

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Proxima Centauri b, an Earth-size planet in the habitable zone of our nearest stellar neighbour, has just been discovered. A theoretical framework of synchronously rotating planets, in which the risk of a runaway greenhouse on the sunlight side and atmospheric collapse on the reverse side are mutually ameliorated via heat transport is discussed. This is developed via simple (tutorial) models of the climate. These show that lower incident stellar flux means that less heat transport, so less...

Topics: Earth and Planetary Astrophysics, Astrophysics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1608.07263

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Jun 29, 2018
06/18

by
Colin Goldblatt

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The dominant paradigm in assigning "habitability"' to terrestrial planets is to define a circumstellar habitable zone: the locus of orbital radii in which the planet is neither too hot nor too cold for life as we know it. One dimensional climate models have identified theoretically impressive boundaries for this zone: a runaway greenhouse or water loss at the inner edge (Venus), and low-latitude glaciation followed by formation of CO2 clouds at the outer edge. A cottage industry now...

Topics: Earth and Planetary Astrophysics, Astrophysics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1603.00950

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Jun 29, 2018
06/18

by
D. E. Ruiz; J. B. Parker; E. L. Shi; I. Y. Dodin

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The wave kinetic equation (WKE) describing drift-wave (DW) turbulence is widely used in studies of zonal flows (ZFs) emerging from DW turbulence. However, this formulation neglects the exchange of enstrophy between DWs and ZFs and also ignores effects beyond the geometrical-optics limit. We derive a modified theory that takes both of these effects into account, while still treating DW quanta ("driftons") as particles in phase space. The drifton dynamics is described by an equation of...

Topics: Atmospheric and Oceanic Physics, Physics, Plasma Physics

Source: http://arxiv.org/abs/1608.05373

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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
Daniel A. Shaevitz; Ji Nie; Adam H. Sobel

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Devastating floods in northeast Pakistan and northern India occurred in July 2010 and September 2014 as a consequence of extreme precipitation events. The 2010 and 2014 flood events had similar synoptic flow patterns that led to an anomalously high moisture content in the flood region. The quasi-geostrophic omega equation is inverted in order to attribute components of the large-scale vertical motion profile to synoptic forcing, diabatic heating, and mechanically forced orographic ascent. The...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1603.01317

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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
David Collins; Boualem Khouider

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The representation of clouds and associated processes of rain and snow formation remains one of the major uncertainties in climate and weather prediction models. In a companion paper (Part I), we systematically derived a two moment bulk cloud microphysics model for collision and coalescence in warm rain based on the kinetic coalescence equation (KCE) and used stochastic approximations to close the higher order moment terms, and do so independently of the collision kernel. Conservation of mass...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1605.02724

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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
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
Dimitrios Giannakis; Joanna Slawinska

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The coupled atmosphere-ocean variability of the Indo-Pacific on interannual to multidecadal timescales is investigated in a millennial control run of CCSM4 and in observations using a family of modes recovered in Part~I of this work from unprocessed SST data through nonlinear Laplacian spectral analysis (NLSA). It is found that ENSO and combination modes of ENSO with the annual cycle exhibit a seasonally synchronized southward shift of equatorial surface zonal winds and thermocline adjustment...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1609.09185

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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
Dominik Traxl; Niklas Boers; Jürgen Kurths

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Network theory has proven to be a powerful tool in describing and analyzing systems by modelling the relations between their constituent objects. In recent years great progress has been made by augmenting `traditional' network theory. However, existing network representations still lack crucial features in order to serve as a general data analysis tool. These include, most importantly, an explicit association of information with possibly heterogeneous types of objects and relations, and a...

Topics: Social and Information Networks, Atmospheric and Oceanic Physics, Data Analysis, Statistics and...

Source: http://arxiv.org/abs/1604.00971

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Jun 29, 2018
06/18

by
Donald B. Percival; Donald W. Denbo; Edison Gica; Paul Y. Huang; Harold O. Mofjeld; Michael C. Spillane; Vasily V. Titov

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A performance measure for a DART tsunami buoy network has been developed. The measure is based on a statistical analysis of simulated forecasts of wave heights outside an impact site and how much the forecasts are degraded in accuracy when one or more buoys are inoperative. The analysis uses simulated tsunami height time series collected at each buoy from selected source segments in the Short-term Inundation Forecast for Tsunamis (SIFT) database and involves a set for 1000 forecasts for each...

Topics: Statistics, Applications, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1607.02795

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Jun 29, 2018
06/18

by
E. Frajka-Williams; M. Lankhorst; J. Koelling; U. Send

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In situ boundary arrays have been installed in the North Atlantic to measure the large-scale ocean circulation. Here, we use measurements at the western edge of the North Atlantic at $16^\circ$N and $26^\circ$N to investigate low-frequency variations in deep densities and their associated influence on ocean transports. At both latitudes, deep waters (below 1100 dbar) at the western boundary are becoming fresher and less dense. The associated change in geopotential thickness is about $0.15$...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1610.06708

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Jun 29, 2018
06/18

by
E. Masciadri; B. Neichel; A. Guesalaga; A. Turchi

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Wide Field Adaptive Optics (WFAO) systems represent the more sophisticated AO systems available today at large telescopes. A critical aspect for these WFAO systems in order to deliver an optimised performance is the knowledge of the vertical spatiotemporal distribution of the CN2 and the wind speed. Previous studies (Cortes et al., 2012) already proved the ability of GeMS (the Gemini Multi-Conjugated AO system) in retrieving CN2 and wind vertical stratification using the telemetry data. To...

Topics: Astrophysics, Instrumentation and Methods for Astrophysics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1608.06489

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Jun 29, 2018
06/18

by
E. Masciadri; F. Lascaux; A. Turchi; L. Fini

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In this contribution we present the most relevant results obtained in the context of a feasibility study (MOSE) undertaken for ESO. The principal aim of the project was to quantify the performances of a mesoscale model (Astro-Meso-NH code) in forecasting all the main atmospherical parameters relevant for the ground-based astronomical observations and the optical turbulence (CN2 and associated integrated astroclimatic parameters) above Cerro Paranal (site of the VLT) and Cerro Armazones (site of...

Topics: Astrophysics, Instrumentation and Methods for Astrophysics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1608.06506

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Jun 29, 2018
06/18

by
Eileen Hertwig; Frank Lunkeit; Klaus Fraedrich

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A set of idealized experiments are performed to analyze the competing effects of declining atmospheric CO2 concentrations, the opening of an ocean gateway, and varying orbital parameters. These forcing mechanisms, which influence the global mean climate state, may have played a role for triggering climate transitions of the past (for example during the Eocene-Oligocene climate transition and the build-up of the Antarctic Ice Sheet). Sensitivity simulations with a coupled atmosphere-ocean...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1602.01259