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Size-frequency Distribution of Earthquakes in Hierarchically Organ...

By: A. F. Pacheco; J. B. Gómez

Description: Departamento de Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain. Large hierarchically organized sets of elements (simulating asperities in a fault) are loaded to the point of complete failure. The fracture thresholds of individual elements are stochastically distributed, and the hierarchical structure for load-transfer is of the fractal-tree type. During the breakdown process there occur bursts (earthquakes) of several elements brea...

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Flux-gradient Relationship for Turbulent Dispersion Over Complex T...

By: G. Tinarelli; D. Anfossi; F. Trombetti; U. Giostra; F. Tampieri; E. Ferrero

Description: Istituto FISBAT/CNR, Via Gobetti 101, 40129 Bologna, Italy. The transfer of a passive tracer in inhomogeneous turbulent flow is investigated. Starting from Lumley's constitutive equation, we derived an expression for the ratio between the effective eddy diffusivity K and eddy diffusivity K as a function of three length scales characterizing the local turbulence structure, flux variations and turbulence inhomogeneities. The theoretical pre...

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3D Nonlinear Inversion by Entropy of Image Contrast Optimization :...

By: M. Biryulina; A. Hanyga; G. Ryzhikov

Description: Institute of Solid Earth Physics, University of Bergen, Allégaten 41, 5007 Bergen, Norway. An approach to solve 3D inverse problem associated with inverting seismic reflection data is presented. It exploits the a priori assumption that the reflection data, reduced properly, can be interpreted as a perturbation of a dynamical response of a certain 'reference background'. It is supposed that the corresponding perturbation of medium parameters can be treate...

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Nonequilibrium Plankton Community Structures in an Ecohydrodynamic...

By: N. Shigesada; H. Malchow

Description: Dept. of Water Modelling & Wadden Sea Research, Inst. of Physics, GKSS Research Centre, Max-Planck-Strasse, D-21502 Geesthacht, Germany. Due to the local and global impacts of algae blooms and patchiness on water quality, carbon cycling and climate, models of plankton dynamics are of current interest. In this paper, the temporal and spatial patterns in natural plankton communities are interpreted as transient and stationary nonequilibrium solutions of dy...

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Finding Recurrence Networks' Threshold Adaptively for a Specific T...

By: S. Prasad; J. Kurths; N. Marwan; D. Eroglu

Description: Potsdam Institute for Climate Impact Research, Potsdam, Germany. Recurrence plot based recurrence networks are an approach to analyze time series using complex networks theory. In both approaches, recurrence plots and recurrence networks, a threshold to identify recurrent states is required. The selection of the threshold is important in order to avoid bias of the recurrence network results. In this paper we propose a novel method to choose a recurrence...

Asghari, N., Broeg, C., Carone, L., Casas-Miranda, R., Palacio, J. C. C., Csillik, I., Dvorak, R., Freistetter, F., Hadjivantsides, G., Hussmann, H., Khramova, A., Khristoforova, M., Khromova, I., Kitiashivilli, I., Kozlowski, S., Laakso, T., Laczkowski, T., Lytvinenko, D., Miloni, O., Morishima, R., Moro-Martin, A., Paksyutov, V., Pal, A., Patidar, V., Pecnik, B., Peles, O., Pyo, J., Quinn, T., Rodriguez, A., Romano, M. C., Saikia, E., Stadel, J., Thiel, M., Todorovic, ...

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Viscous Heating in Fluids with Temperature-dependent Viscosity: Im...

By: G. MacEdonio; A. Costa

Description: Dipartimento di Scienze della Terra e Geologico-Ambientali, Università di Bologna, Italy. Viscous heating plays an important role in the dynamics of fluids with strongly temperature-dependent viscosity because of the coupling between the energy and momentum equations. The heat generated by viscous friction produces a local temperature increase near the tube walls with a consequent decrease of the viscosity which may dramatically change th...

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Do Climate Simulations from Models Forced by Averaged Sea Surface ...

By: P. J. Roebber; A. A. Tsonis; J. B. Elsner

Description: Department of Goesciences, University of Wisconsin at Milwaukee, 3209 N. Maryland, Milwaukee, WI, USA 53211. Recently atmospheric general circulation models (AGCMs) forced by observed sea surface temperatures (SSTs) have offered the possibility of studying climate variability over periods ranging from years to decades. Such models represent and alternative to fully coupled asynchronous atmosphere ocean models whose long term integration remains problema...

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Non-equilibrium Effects of Core-cooling and Time-dependent Interna...

By: S. Balachandar; J. J. Smedsmo; V. C. Steinbach; D. M. Reuteler; G. S. Lauer; D. A. Yuen; S. Honda

Description: Dept. Geology, Geophysics and Minnesota Supercomputer Inst., Univ. of Minnesota, Minneapolis, MN 55415-1227, USA. We have examined the non-equilibrium effects of core-cooling and time-dependent internal-heating on the thermal evolution of the Earth's mantle and on mantle flush events caused by the two major phase transitions. Both two- and three-dimensional models have been employed. The mantle viscosity responds to the secular cooling through changes in...

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Sea Surface Temperature Patterns in Tropical Atlantic: Principal C...

By: N. M. Hounkonnou; G. N. Bawe; S. C. Kenfack; D. A. Vondou; G. Alory; K. F. Mkankam; Y. Du Penhoat

Description: International Chair in Mathematical Physics and Applications, University of Abomey-Calavi, Cotonou, Benin. Principal Component Analysis (PCA) is one of the popular statistical methods for feature extraction. The neural network model has been performed on the PCA to obtain nonlinear principal component analysis (NLPCA), which allows the extraction of nonlinear features in the dataset missed by the PCA. NLPCA is applied to the monthly Sea Surface Temperatu...

Hagos, S. M. and Cook, K. H.: Development of a coupled regional model and its application to the study of interactions between the West African monsoon and the eastern tropical Atlantic ocean, J. Climate, 18, 4993–5010, 2008.; Hastenrath, S. and Lamb, P. J.: Climatic Atlas of the Tropical Atlantic and Eastern Pacific Oceans, The University of Wisconsin Press, Madison, 112 pp., 1977.; Hastie, T. and Stuetzle, W.: Principal curves, J. Am. Stat. Assoc., 84, 502–516, 1989.; ...

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Intermittent Heating of the Solar Corona by Mhd Turbulence : Volum...

By: É. Buchlin

Description: Space and Atmospheric Physics group, Blackett Laboratory, Imperial College, London, UK. As the dissipation mechanisms considered for the heating of the solar corona would be sufficiently efficient only in the presence of small scales, turbulence is thought to be a key player in the coronal heating processes: it allows indeed to transfer energy from the large scales to these small scales. While Direct numerical simulations which have been performed ...

Abramenko, V I., Yurchyshyn, V B., Wang, H., Spirock, T J., and Goode, P R.: Scaling Behavior of Structure Functions of the Longitudinal Magnetic Field in Active Regions on the Sun, Astrophys. J., 577, 487–495, 2002.; Alexakis, A., Mininni, P D., and Pouquet, A.: Shell-to-shell energy transfer in magnetohydrodynamics. I. Steady state turbulence, Phys. Rev. E, 72, 046 301, 2005.; Bak, P., Tang, C., and Wiesenfeld, K.: Self-organized criticality – An explanation of $1/f$ n...

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A Typical Wave Wake from High-speed Vessels: Its Group Structure a...

By: A. Rodin; I. Didenkulova

Description: Laboratory of Wave Engineering, Institute of Cybernetics at Tallinn University of Technology, Akadeemia tee 21, 12618 Tallinn, Estonia. High-amplitude water waves induced by high-speed vessels are regularly observed in Tallinn Bay, the Baltic Sea, causing intense beach erosion and disturbing marine habitants in the coastal zone. Such a strong impact on the coast may be a result of a certain group structure of the wave wake. In order to understand it, her...

Brown, E. D., Buchsbaum, S. B., Hall, R. E., Penhune, J. P., Schmitt, K. F., Watson, K. M., and Wyatt, D. C.: Observations of a nonlinear solitary wave packet in the Kelvin wake of a ship, J. Fluid Mech., 204, 263–293, 1989.; Didenkulova, I., Parnell, K. E., Soomere, T., Pelinovsky, E., and Kurennoy, D.: Shoaling and runup of long waves induced by high-speed ferries in Tallinn Bay, J. Coast. Res., Special Issue, 56, 491–495, 2009a.; Didenkulova, I., Pelinovsky, E., and R...

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Synchronization in a Coupled Two-layer Quasigeostrophic Model of B...

By: P. L. Read; A. A. Castrejón-pita

Description: Atmospheric, Oceanic & Planetary Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK. Synchronization is studied using a pair of diffusively-coupled, two-layer quasi-geostrophic systems each comprising a single baroclinic wave and a zonal flow. In particular, the coupling between the systems is in the well-known master-slave or one-way configuration. Nonlinear time series analysis, phase dynamics, and bifurcation diagram...

Andrews, D.: An Introduction to Atmospheric Physics, Cambridge University Press, pp. 140–153, 2000.; Anishchenko, V. S., Silchenko, A. N., and Khovanov, I. A.: Synchronization of switching processes in coupled Lorenz systems, Phys. Rev. E, 57(1), 316–322, 1998.; Appleby, J.: Comparative theoretical and experimental studies of baroclinic waves in a two-layer system, PhD Thesis, University of Leeds, UK, 1982.; Boccaletti, S., Kurths, J., Osipov, G., Valladares, D. K., and ...

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Low-frequency Linear Waves and Instabilities in Uniform and Strati...

By: K. M. Ferrière

Description: Observatoire Midi-Pyrénées, Toulouse, France. We review the basic approximations underlying magnetohydrodynamic (MHD) theory, with special emphasis on the closure approximations, i.e. the approximations used in any fluid approach to close the hierarchy of moment equations. We then present the main closure models that have been constructed for collisionless plasmas in the large-scale regime, and we describe our own mixed MHD-kinetic model, which is desi...

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Direct Numerical Simulation of Intermittent Turbulence Under Stabl...

By: P. He; S. Basu

Description: Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina, 27695, USA. In this paper, we simulate intermittent turbulence (also known as bursting events) in stably stratified open-channel flows using direct numerical simulation. Clear signatures of this intriguing phenomenon are observed for a range of stabilities. However, the spatio-temporal characteristics of intermittency are found to be str...

Ansorge, C. and Mellado, J. P.: Global intermittency and collapsing turbulence in the stratified planetary boundary layer, Bound.-Lay. Meteorol., 153, 89–116, 2014.; Armenio, V. and Sarkar, S.: An investigation of stably stratified turbulent channel flow using large-eddy simulation, J. Fluid Mech., 459, 1–42, 2002.; Barnard, J. C.: Intermittent turbulence in the very stable Ekman layer, PhD thesis, University of Washington, Washington, 2000.; Basu, S. and Porté-Agel, F.:...

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Instability and Change Detection in Exponential Families and Gener...

By: S. Chatterjee; Y. Lu

Description: Amazon.com, Inc., 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 t...

Hawkins, D. M.: Evaluation of Average Run Lengths of Cumulative Sum Charts for an Arbitrary Data Distributions, Commun. Stat.-Simulat. Comput., 21, 1001–1020, 1992.; 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, Communic. Stat.-Theory Methods, 29, 2879–2893, 2000.; Atienza, O. O., Tang, L. C., and Ang, B. W.: A Uniform Most Powerful Cumulative Sum Scheme B...

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Hamiltonian Description of Wave Dynamics in Nonequilibrium Media :...

By: N. N. Romanova

Description: Institute of Atmospheric Physics, Russian Academy of Sciences, Pyzhevsky 3, 109017, Moscow, Russia. We consider Hamiltonian description of weakly nonlinear wave dynamics in unstable and nonequilibrium media. We construct the appropriate canonical variables in the whole wavenumber space. The essentially new element is the construction of canonical variables in a vicinity of marginally stable points where two normal modes coalesce. The commonly used normal...

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Enhanced Monte Carlo Singular System Analysis and Detection of Per...

By: D. Novotná; M. Paluš

Description: Institute of Computer Science, Academy of Sciences of the Czech Republic, Pod vodárenskou vĕží 2, 182 07 Prague 8, Czech Republic. An extension of the Monte Carlo Singular System Analysis (MC SSA) is described, based on evaluating and testing regularity of dynamics of the SSA modes against the colored noise null hypothesis, in addition to the test based on variance (eigenvalues). The application of the regularity index, computed from a coarse-grained e...

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Corrigendum to Breeding and Predictability in the Baroclinic Rotat...

By: R. M. B. Young; P. L. Read

Description: Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, UK. No abstract available.

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Parameter Variations in Prediction Skill Optimization at Ecmwf : V...

By: M. Leutbecher; P. Bechtold; M. Laine; A. Solonen; H. Järvinen; P. Ollinaho; H. Haario

Description: Finnish Meteorological Institute, Erik Palménin aukio 1, Helsinki, Finland. Algorithmic numerical weather prediction (NWP) skill optimization has been tested using the Integrated Forecasting System (IFS) of the European Centre for Medium-Range Weather Forecasts (ECMWF). We report the results of initial experimentation using importance sampling based on model parameter estimation methodology targeted for ensemble prediction systems, called the ensemble p...

Buizza, R., Miller, M., and Palmer, T. N.: Stochastic representation of model uncertainties in the ECMWF ensemble prediction system, Q. J. R. Meteorol. Soc., 125, 2887–2908, 1999.; Buizza, R., Leutbecher, M., and Isaksen, L.: Potential use of an ensemble of analyses in the ECMWF ensemble prediction system, Q. J. R. Meteorol. Soc., 134, 2051–2066, 2008.; de Rooy, W. C., Bechtold, P., Fröhlich, K., Hohenegger, C., Jonker, H., Mironov, S., Teixeira, J., and Yano, J.-I.: Ent...

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Magnetic Field Turbulence, Electron Heating, Magnetic Holes, Proto...

By: J. K. Arballo; G. S. Lakhina; B. Dasgupta; B. T. Tsurutani; J. S. Pickett

Description: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. Two electron heating events have been identified on 20 May 1996 when Polar was in the polar cap/polar cusp boundary layer. The electron heating events were located within magnetic holes/cavities/bubbles and were accompanied by nonlinear ± 14 nT peak-to-peak (f ~ 0.6 to 0.7 fcp) obliquely propagating proton cyclotron waves. The electrons appear to ...

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