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Jun 29, 2018
06/18

by
Alvaro Subias

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Finite elements has been proven to be an useful tool to discretize the vertical coordinate in the hydrostatic forecast models allowing to define model variables in full levels so that no staggering is needed. In the non-hydrostatic case a constraint in the vertical operators appears (called C1) that does not allow to reduce the set of semi-implicit linear equations to a single equation in one variable as in the analytic case. Recently vertical finite elements based in B-splines have been used...

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

Source: http://arxiv.org/abs/1601.03446

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0.0

Jun 30, 2018
06/18

by
Zhangping Wei; Huabin Shi; Cheng Li; Joseph Katz; Robert A. Dalrymple; Giuseppe Bilotta

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A two-phase Smoothed Particle Hydrodynamics (SPH) model has been developed on the basis of GPUSPH, which is an open-source implementation of the weakly compressible SPH method on graphics processing units, to investigate oil dispersion under breaking waves. By assuming that the multiple phases are immiscible, the two-phase model solves the same set of governing equations for both phases. Density in each phase is preserved by renormalization, and the harmonic mean of viscosities is used in the...

Topics: Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1702.07760

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1.0

Jun 28, 2018
06/18

by
Takahito Mitsui; Michel Crucifix; Kazuyuki Aihara

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Glacial-interglacial cycles are large variations in continental ice mass and greenhouse gases, which have dominated climate variability over the Quaternary. The dominant periodicity of the cycles is $\sim $40 kyr before the so-called middle Pleistocene transition between $\sim$1.2 and $\sim$0.7 Myr ago, and it is $\sim $100 kyr after the transition. In this paper, the dynamics of glacial-interglacial cycles are investigated using a phase oscillator model forced by the time-varying incoming...

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

Source: http://arxiv.org/abs/1506.04628

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0.0

Jun 30, 2018
06/18

by
Eleanor Frajka-Williams; Eric Kunze; Jennifer A. MacKinnon

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Bispectral analysis of the nonlinear resonant interaction known as parametric subharmonic instability (PSI) for a coherence semidiurnal internal tide demonstrates the ability of the bispectrum to identify and quantify the transfer rate. Assuming that the interaction is confined to a vertical plane, energy equations transform in such a way that nonlinear terms become the third-moment spectral quantity known as the bispectrum. Bispectral transfer rates computed on PSI in an idealized,...

Topics: Physics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1410.0926

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5.0

Jun 28, 2018
06/18

by
João H. Bettencourt; Cristóbal López; Emilio Hernández García; Ivonne Montes; Joël Sudre; Boris Dewitte; Aurélien Paulmier; Véronique Garçon

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Dissolved oxygen in sea water is a major factor affecting marine habitats and biogeochemical cycles. Oceanic zones with oxygen deficits represent significant portions of the area and volume of the oceans and are thought to be expanding. The Peruvian oxygen minimum zone is one of the most pronounced and lies in a region of strong mesoscale activity in the form of vortices and frontal regions, whose effect in the dynamics of the oxygen minimum zone is largely unknown. Here, we study this issue...

Topics: Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1506.04295

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5.0

Jun 26, 2018
06/18

by
Antonio Degasperis; Stefan Wabnitz; Alejandro B. Aceves

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We derive the rogue wave solution of the classical massive Thirring model, that describes nonlinear optical pulse propagation in Bragg gratings. Combining electromagnetically induced transparency with Bragg scattering four-wave mixing, may lead to extreme waves at extremely low powers.

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

Source: http://arxiv.org/abs/1501.05644

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4.0

Jun 28, 2018
06/18

by
S. A. Dyachenko; P. M. Lushnikov; A. O. Korotkevich

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Complex analytical structure of Stokes wave for two-dimensional potential flow of the ideal incompressible fluid with free surface and infinite depth is analyzed. Stokes wave is the fully nonlinear periodic gravity wave propagating with the constant velocity. Simulations with the quadruple and variable precisions are performed to find Stokes wave with high accuracy and study the Stokes wave approaching its limiting form with $2\pi/3$ radians angle on the crest. A conformal map is used which...

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

Source: http://arxiv.org/abs/1507.02784

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0.0

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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4.0

Jun 27, 2018
06/18

by
V. P. Kiliyanpilakkil; S. Basu; A. Ruiz-Columbié; G. Araya; L. Castillo; B. Hirth; W. Burgett

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We have analyzed long-term wind speed time-series from five field sites up to a height of 300 m from the ground. Structure function-based scaling analysis has revealed that the scaling exponents in the mesoscale regime systematically depend on height. This anomalous behavior is likely caused by the buoyancy effects. In the framework of the extended self-similarity, the relative scaling exponents portray quasi-universal behavior.

Topics: Fluid Dynamics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1504.07316

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Jun 30, 2018
06/18

by
M. V. Carneiro; K. R. Rasmussen; H. J. Herrmann

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Close to the onset of Aeolian particle transport through saltation we find in wind tunnel experiments a regime of discontinuous flux characterized by bursts of activity. Scaling laws are observed in the time delay between each burst and in the measurements of the wind fluctuations at the fluid threshold Shields number $\theta_c$. The time delay between each burst decreases on average with the increase of the Shields number until sand flux becomes continuous. A numerical model for saltation...

Topics: Physics, Fluid Dynamics, Atmospheric and Oceanic Physics

Source: http://arxiv.org/abs/1403.4840