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Remarks on Rotating Shallow-water Magnetohydrodynamics : Volume 20...

By: V. Zeitlin

Description: Institut Universitaire de France, Laboratoire de Météorologie Dynamique, UMR8539, CNRS – University P. and M. Curie and Ecole Normale Supérieure, Paris, France. We show how the rotating shallow-water MHD model, which was proposed in the solar tachocline context, may be systematically derived by vertical averaging of the full MHD equations for the rotating magneto fluid under the influence of gravity. The procedure highlights the main approximations and th...

Shecter, D. A., Boyd, J. F., and Gilman, P. A.: Shallow-water magnetohydrodynamic waves in the solar tachocline, Astrophys. J. Lett, 551, L185–L188, 2001.; Ripa, P.: On improving a one-layer ocean model with thermodynamics, J. Fluid Mech., 303, 169–207, 1995.; Bouchut, F.: Ch. 4, in: Nonlinear Dynamics of Rotating Shallow Water: Methods and Advances, edited by: Zeitlin, V., Elsevier, NY, 2007.; Dellar, P. J.: Hamiltonian and symmetric hyperbolic structure of shallow wate...

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Controlling Instabilities Along a 3Dvar Analysis Cycle by Assimila...

By: L. Descamps; O. Talagrand; A. Trevisan; A. Carrassi; F. Uboldi

Description: Royal Meteorological Institute of Belgium – RMI, Bruxelles, Belgium. A hybrid scheme obtained by combining 3DVar with the Assimilation in the Unstable Subspace (3DVar-AUS) is tested in a QG model, under perfect model conditions, with a fixed observational network, with and without observational noise. The AUS scheme, originally formulated to assimilate adaptive observations, is used here to assimilate the fixed observations that are found in the regi...

Anderson, J.: A local least squares framework for ensemble filtering, Mon. Wea. Rev., 131, 634–642, 2003.; Anderson, J. and Anderson, S.: A Monte Carlo implementation of the nonlinear filtering problem to produce ensemble assimilation and forecast, Mon. Wea. Rev., 127, 2741–2758, 1999.; Benettin, G., Galgani, L., Giorgilli, A., and Strelcyn, J.: Lyapunov characteristic exponents for smooth dynamical systems and for Hamiltonian systems; a method for computing them, Meccan...

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Optimal Localized Observations for Advancing Beyond the Enso Predi...

By: W. Kramer; H. A. Dijkstra

Description: Institute for Marine and Atmospheric research Utrecht, Department of Physics and Astronomy, Utrecht University, Utrecht, the Netherlands. The existing 20-member ensemble of 50 yr ECHAM5/MPI-OM simulations provides a reasonably realistic Monte Carlo sample of the El Niño–Southern Oscillation (ENSO). Localized observations of sea surface temperature (SST), zonal wind speed and thermocline depth are assimilated in the ensemble using sequential importance sa...

Battisti, D. S. and Hirst, A. C.: Interannual variability in a tropical atmosphere-ocean model: Influence of the basic state, ocean geometry and nonlinearity, J. Atmos. Sci., 46, 1687–1712, 1989.; Burgers, G. and Stephenson, D. B.: The Normality of {E}l {N}i{ñ}o, Geophys. Res. Lett., 26, 1027–1030, 1999.; Chen, Y. Q., Battisti, D. S., Palmer, T. N., Barsugli, J., and Sarachik, E. S.: Study of the predictability of tropical SST in a coupled atmosphere-ocean model using si...

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Quasiadiabatic Description of Nonlinear Particle Dynamics in Typic...

By: A. I. Neishtadt; L. M. Zelenyi; J. Büchner; D. L. Vainchtein

Description: Space Research Institute, ul.Profsouznaya, 84/32, Moscow, Russia, GSP-7, 117997. In the present paper we discuss the motion of charged particles in three different regions of the Earth magnetotail: in the region with magnetic field reversal and in the vicinities of neutral line of X- and O-types. The presence of small parameters (ratio of characteristic length scales in and perpendicular to the equatorial plane and the smallness of the elect...

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On the Predominance of Oblique Disturbances in the Supersonic Shea...

By: V. V. Mishin

Description: Institute of Solar-Terrestrial Physics Russian Academy of Sciences, P.O. Box 4026, Irkutsk 664033, Russia. A study is made of the influence of the longitudinal magnetic field and density inhomogeneity on the supersonic shear flow instability at the magnetospheric tail boundary. It is shown that the most unstable are slow oblique (3D) disturbances, with a phase velocity approaching at a sufficiently large angle (with respect to the flow di...

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Universal Dependences Between Turbulent and Mean Flow Parameters I...

By: S. S. Zilitinkevich; I. N. Esau

Description: Nansen Environmental and Remote Sensing Centre, Thormohlensgate 47, 5006 Bergen, Norway. We consider the resistance law for the planetary boundary layer (PBL) from the point of view of the similarity theory. In other words, we select the set of the PBL governing parameters and search for an optimal way to express through these parameters the geostrophic drag coefficient Cg=u* /Ug and the cross isobaric angle Α (wher...

Banta, R. M., Newsom, R. K., Lundquist, J. K., Pichugina, Y. L., Coulter, R. L., and Mahrt, L.: Nocturnal Low-Level Jet Characteristics Over Kansas During Cases-99, Boundary-Layer Meteorol., 105, 221-252, 2002.; Beare, R. J., MacVean, M. K., Holtslag, A. A. M., Cuxart, J. , Esau, I., Golaz, J.-C., Jimenez, M. A., Khairoutdinov, M., Kosovic, B., Lewellen, D., Lund, T. S., Lundquist, J. K., McCabe, A., Moene, A. F., Noh, Y., Raasch, S., and Sullivan, P.: An intercomparison...

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Convex and Concave Types of Second Baroclinic Mode Internal Solita...

By: Y. C. Fang; T. Y. Tang; S. R. Ramp; Y. J. Yang

Description: Department of Marine Science, Naval Academy, Kaohsiung, Taiwan. Two types of second baroclinic mode (mode-2) internal solitary waves (ISWs) were found on the continental slope of the northern South China Sea. The convex waveform displaced the thermal structure upward in the upper layer and downward in the lower layer, causing a bulge in the thermocline. The concave waveform did the opposite, causing a constriction. A few concave waves were observed in t...

Gill, A. E.: Atmosphere-Ocean Dynamics, Academic Press, San Diego, 662 pp., 1982; Grimshaw, R.: Evolution equations for long nonlinear waves in stratified shear flow, Stud. Appl. Math., 65, 159–188, 1981.; Gear, J. and Grimshaw, R.: A second-order theory for solitary waves in shallow fluids, Phys. Fluids, 26, 14–29, 1983.; Akylas, T. and Grimshaw, R.: Solitary internal waves with oscillatory tails, J. Fluid Mech., 242, 279–298, 1992.; Alpers, W.: Theory of radar imaging ...

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Sporadic Wind Wave Horse-shoe Patterns : Volume 6, Issue 1 (30/11/...

By: S. Yu. Annenkov; V. I. Shrira

Description: P.P. Shirhov Institute of Oceanology, 36 Nakhirnovsky prosp., Moscow 117218, Russia. The work considers three-dimensional crescent-shaped patterns often seen on water surface in natural basins and observed in wave tank experiments. The most common of these 'horse-shoe-like' patterns appear to be sporadic, i.e., emerging and disappearing spontaneously even under steady wind conditions. The paper suggests a qualitative model of these structures aimed at ex...

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Analysis of the Atmosphere Behaviour in the Proximities of an Orog...

By: A. García; L. C. Cana; J. Díaz; E. Hernández

Description: Departamento de Astrofisica y Ciencias de la Atmósfera, Facultad de Ciencias Fisicas, Universidad Complutense, 28040 Madrid, Spain. The atmospheric behaviour near an orographic obstacle has been thoroughly studied in the last decades. The first papers in this field were mainly theoretical, being more recent the laboratory experiments which represented that behaviour in ideal conditions. The numerical simulations have been addressed lately thanks to the d...

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Identification of Magnetic Anomalies Based on Ground Magnetic Data...

By: A. A. Karbalaei Ramezanali; F. Feizi; E. Mansouri

Description: Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran. Ground magnetic anomaly separation using reduction-to-the-pole (RTP) technique and the fractal concentration-area (C-A) method has been applied to the Qoja-Kandi prosepecting area in NW Iran. The geophysical survey that resulted in the ground magnetic data was conducted for magnetic elements exploration. Firstly, RTP technique was applied for recognizing u...

Abedi, M., Torabi, S. A., and Norouzi, G. H.: Application of fuzzy AHP method to integrate geophysical data in a prospect scale, a case study: seridune copper deposit, B. Geofis. Teor. Appl., 54, 145–164, 2013.; Agterberg, F. P., Cheng, Q., Brown, A., and Good, D.: Multifractal modeling of fractures in the Lac du Bonnet batholith, Manitoba, Comput. Geosci., 22, 497–507, 1996.; Arian, M.: Physiographic-tectonic zoning of Iran's sedimentary basins, Open Journal of Geology,...

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Vlasov Simulation of Langmuir Wave Packets : Volume 14, Issue 5 (2...

By: T. Umeda

Description: Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan. Amplitude modulation and packet formation of Langmuir waves are commonly observed during a nonlinear interaction between electron beams and plasmas. In this paper, we briefly review the history of Langmuir wave packets as developed by recent spacecraft observations and computer simulations. New one-dimensional electrostatic Vlasov simulations are performed to ...

Akimoto, K., Omura, Y., and Matsumoto, H.: Rapid generation of Langmuir wave packets during electron beam-plasma instabilities, Phys. Plasmas, 3, 2559–2563, 1996.; % Solar wind Bale, S D., Burgess, D., Kellogg, P. J., Goetz, K., Howard, R L., and Monson, S J.: Phase coupling in Langmuir wave packets: Possible evidence of three-wave interactions in the upstream solar wind, Geophys. Res. Lett., 23, 109–112, 1996.; Berk, H. L. and Roberts, K. V.: Nonlinear study of Vlasov's...

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Non-equilibrium Quasi-stationary States in a Magnetized Plasma : V...

By: S. V. Ratynskaia; O. E. Garcia; J.-v. Paulsen; V. I. Demidov; K. Rypdal

Description: Department of Physics, University of Tromsø, 9037 Tromsø, Norway. Non-equilibrium quasi-stationary states resulting from curvature driven interchange instabilities and drift-wave instabilities in a low beta, weakly ionized, magnetized plasma are investigated in the context of laboratory experiments in a toroidal configuration. Analytic modelling, numerical simulations and experimental results are discussed with emphasis on identifying...

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The Evolution of Mode-2 Nonlinear Internal Waves Over the Northern...

By: D. B. Reeder; M. C. Buijsman; Y. J. Yang; F. L. Bahr; S. R. Ramp

Description: Soliton Ocean Services, Inc., Carmel Valley, CA 93924, USA. Two research cruises were conducted from the R/V OCEAN RESEARCHER 3 during 5–16 August 2011 to study the generation of high-frequency nonlinear internal waves (NLIW) over the northern Heng-Chun Ridge south of Taiwan. The primary study site, centered near 21°34' N, 120°54' E, was on top of a smaller ridge about 15 km wide by 400 m high atop the primary ridge, with a sill depth of a...

Alford, M. H., Lien, R.-C., Simmons, H., Klymak, J., Ramp, S. R., Yang, Y.-J., Tang, T.-Y., Farmer, D., and Chang, M.-H.: Speed and evolution of nonlinear internal waves transiting the South China Sea, J. Phys. Oceanogr., 40, 1338–1355, 2010.; Alford, M. H., MacKinnon, J. A., Nash, J. D., Simmons, H., Pickering, A., Klymak, J. M., Pinkel, R., Sun, O., Rainville, L., Musgrave, R., Beitzel, T., Fu, K.-H., and Lu, C.-W.: Energy flux and Dissipation in Luzon Strait: two tale...

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Bayesian Estimation of the Self-similarity Exponent of the Nile Ri...

By: N. Benhamidouche; M. Holschneider; N. Makarava; S. Benmehdi

Description: Departement of Mathematics, University of Bourdj-Bouarreridj, Box 64, 34265 Bourdj-Bouarreridj, Algeria. The aim of this paper is to estimate the Hurst parameter of Fractional Gaussian Noise (FGN) using Bayesian inference. We propose an estimation technique that takes into account the full correlation structure of this process. Instead of using the integrated time series and then applying an estimator for its Hurst exponent, we propose to use the noise s...

Abry, P. and Veitch, D.: Wavelet Analysis of Long-Range-Dependent Traffic, IEEE T. Inform., 44, 2–15, 1998.; Abry, P. and Pipiras, V.: Wavelet-based synthesis of the Rosenblatt process, Signal Process., 86, 2326–2339, doi:10.1016/j.sigpro.2005.10.021, 2006.; Dieker, T.: Simulation of Fractional Brownian motion, Ph.D. thesis, Twente University, 2004.; Geweke, K. and Porter-Hudak, S.: The estimation and application...

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Book Review of Stochastic Physics and Climate Modelling - a Trilli...

By: D. Schertzer
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Instability and Change Detection in Exponential Families and Gener...

By: S. Chatterjee; Y. Lu

Description: Amazon.com, Seattle, Washington, USA. Exponential family statistical distributions, including the well-known Normal, Binomial, Poisson, and exponential distributions, are overwhelmingly used in data analysis. In the presence of covariates, an exponential family distributional assumption for the response random variables results in a generalized linear model. However, it is rarely ensured that the parameters of the assumed distributions are stable throug...

Albers, W. and Kallenberg, W. C. M.: CUMIN Charts, Metrika, 70, 111–130, 2009.; Alwan, L. C.: Designing an Effective EF-CUSUM Chart without the Use of Nomographs, Commun. Stat. A-Theor., 29, 2879–2893, 2000.; Atienza, O. O., Tang, L. C., and Ang, B. W.: A Uniform Most Powerful Cumulative Sum Scheme Based on Symmetry, J. Roy. Stat. Soc. D-Sta., 49, 209–217, 2000.; Bolton, R. J. and Hand, D. J.: Statistical fraud detection: A review, Stat. Sci., 17, 235–255, 2002.; Brown, ...

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Achieving Fast Reconnection in Resistive Mhd Models Via Turbulent ...

By: A. Lazarian; G. Lapenta

Description: Centrum voor Plasma-Astrofysica, Departement Wiskunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium. Astrophysical fluids are generally turbulent and this preexisting turbulence must be taken into account for models of magnetic reconnection in astrophysical, solar or heliospheric environments. In addition, reconnection itself induces turbulence which provides an important feedback on the reconnection process. In this paper w...

Alfv{én}, H.: Existence of Electromagnetic-Hydrodynamic Waves, Nature, 150, 405–406, 1942.; Armstrong, J. W., Rickett, B. J. and Spangler, S. R.: Electron density power spectrum in the local interstellar medium, Astrophys. J., 443, 209–221, 1995.; Beck, R., Brandenburg, A., Moss, D., Shukurov, A., and Sokoloff, D.: Galactic Magnetism: Recent Developments and Perspectives, Annu. Rev. Astronomy and Astrophysics, 34, 155–206, 1996.; Beresnyak, A. and Lazarian, A.: Structure...

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Strategies for Coupling Global and Limited-area Ensemble Kalman Fi...

By: E. Ott; I. Szunyogh; D. Merkova

Description: University of Maryland, College Park, MD, USA. This paper compares the forecast performance of four strategies for coupling global and limited area data assimilation: three strategies propagate information from the global to the limited area process, while the fourth strategy feeds back information from the limited area to the global process. All four strategies are formulated in the Local Ensemble Transform Kalman Filter (LETKF) framework.

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Juang, H. M. H., Hong, S. Y., and Kanamitsu, M.: The NCEP {R}egional {S}pectral {M}odel: {A}n Update, Bull. Am. Meteorol. Soc., 78, 2125–2143, 1997.; Juang, H. M. H. and Kanamitsu, M.: The NMC Nested {R}egional {S}pectral {M}odel, Mon. Weather Rev., 122, 3–26, 1994.; Bishop, C. H., Etherton, B. J., and Majumdar, S. J.: Adaptive Sampling with the ensemble transform {K}alman filter, {P}art {I}: Theoretical Aspects, Mon. Weather Rev., 129, 420–436, 2001.; Fertig, E. J., Bae...

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Bifurcations and Instabilities in Rotating Two-layer Fluids: I.F-p...

By: I. M. Moroz; P. L. Read; A. F. Lovegrove

Description: Atmospheric, Oceanic & Planetary Physics, University of Oxford, United Kingdom. In this paper, we show that the behaviour of weakly nonlinear waves in a 2-layer model of baroclinic instability on an f-plane with varying viscosity is determined by a single, degenerate codimension three bifurcation. In the process, we show how previous studies, using the method of multiple scales to derive evolution equations for the slowly varying amplitud...

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Strongly Nonlinear, Simple Internal Waves in Continuously-stratifi...

By: K. R. Helfrich; L. A. Ostrovsky

Description: Zel Technologies and University of Colorado, Boulder, CO, USA. Strongly nonlinear internal waves in a layer with arbitrary stratification are considered in the hydrostatic approximation. It is shown that simple waves having a variable vertical structure can emerge from a wide class of initial conditions. The equations describing such waves have been obtained using the isopycnal coordinate as a variable. Emergence of simple waves from an initial Gaussian...

Apel, J. R., Ostrovsky, L. A., Stepanyants, Y. A., and Lynch, J. F.: Internal solitons in the ocean and their effect on underwater sound, J. Acoust. Soc. Amer., 121, 695–722, 2007.; Baines, P. G.: Topographic effects in stratified flows, Cambridge University Press, 482 pp., 1995.; Jiang, Q. and Smith R.: Ideal shocks in 2-layer flow. Part I: Under a rigid lid, Tellus, 53A, 129–145, 2001.; Chumakova, L., Menzaque, F. E., Milewski, P. A., Rosales, R. R., Tabak, E. G., and ...

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