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Shallow Seismicity in the Area of Greece: Its Character as Seen by...

By: L. C. Polimenakos

Description: PANGAEA Consulting Engineers, Kifissias Avenue 131, GR 11524 Athens, Greece. Occurrence of successive earthquake events in space is analysed by means of semi-stochastic processes. The analysis employs earthquakes events with M > 5.2 from the area of Greece and its surroundings (18-31° E, 34-43° N) for the time interval 1911-1985. The sequence of earthquake occurrences can be only marginally described by a first order Markov chain model. Substituta...

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Asymmetric Multifractal Model for Solar Wind Intermittent Turbulen...

By: W. M. MacEk; A. Szczepaniak

Description: Space Research Centre, Polish Academy of Science, Bartycka 18A, 00-716 Warsaw, Poland. We consider nonuniform energy transfer rate for solar wind turbulence depending on the solar cycle activity. To achieve this purpose we determine the generalized dimensions and singularity spectra for the experimental data of the solar wind measured in situ by Advanced Composition Explorer spacecraft during solar maximum (2001) and minimum (2006) at 1 AU. By determin...

Marsch, E. and Tu, C.-Y.: Intermittency, non-Gaussian statistics and fractal scaling of MHD fluctuations in the solar wind, Nonlin. Processes Geophys., 4, 101–124, 1997.; Marsch, E., Tu, C.-Y., and Rosenbauer, H.: Multifractal scaling of the kinetic energy flux in solar wind turbulence, Ann. Geophys., 14, 259–269, 1996.; Meneveau, C. and Sreenivasan, K. R.: Simple multifractal cascade model for fully developed turbulence, Phys. Rev. Lett., 59, 1424–1427, 1987.; Meneveau,...

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The Fourth Workshop on Nonlinear Processes in Space Plasmas: Epilo...

By: S. R. Spangler

Description: Department of Physics and Astronomy, University of Iowa, USA.

No Abstract available.

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Kinetic Slow Mode-type Solitons : Volume 12, Issue 2 (11/02/2005)

By: E. Dubinin; K. Sauer; K. Baumgärtel

Description: Astrophysikalisches Institut Potsdam, Germany. One-dimensional hybrid code simulations are presented, carried out in order both to study solitary waves of the slow mode branch in an isotropic, collisionless, medium-Β plasma (Βi=0.25) and to test the fluid based soliton interpretation of Cluster observed strong magnetic depressions (Stasiewicz et al., 2003; Stasiewicz, 2004) against kinetic theory. In the simulations, a variety of strongly obl...

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On the Influence of a Large Scale Coherent Vortex on the Turbulent...

By: R. Labbé; J.-f. Pinton; F. Chillà

Description: École Normale Supérieure de Lyon, Laboratoire de Physique, 46 allée d'Italie, F-69364 Lyon cedex 07, France. We investigate the flow between coaxial rotating disks in the situation where a strong axial vortex is present over a turbulent background. This is nonstationary and inhomogeneous as is common in most turbulent geophysical flows. We describe the s scale statistics using tools recently introduced for homogeneous tu...

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Physical Simulation of Resonant Wave Run-up on a Beach : Volume 20...

By: E. Pelinovsky; N. Abcha; A. Ezersky

Description: CNRS, UMR6143 – Morphodynamique Continentale et Côtière (M2C), Université Caen Basse, Normandie, 24 rue des Tilleuls, 14000 Caen, France. Nonlinear wave run-up on the beach caused by a harmonic wave maker located at some distance from the shore line is studied experimentally. It is revealed that under certain wave excitation frequencies, a significant increase in run-up amplification is observed. It is found that this amplification is due to the excitati...

Antuono, M. and Brocchini, M.: Solving the nonlinear shallow-water equations in physical sense, J. Fluid Mech., 643, 207–232, 2010.; Carrier, G. F. and Greenspan, H. P.: Water waves of finite amplitude on a sloping beach, J. Fluid Mech., 4, 97–109, 1958.; Carrier, G. F., Wu, T. T., and Yeh, H.: Tsunami run-up and draw-down on a plane beach, J. Fluid Mech., 475, 79–99, 2003.; Denissenko, P., Didenkulova, I., Pelinovsky, E., and Pearson, J.: Influence of the nonlinearity o...

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Identification of Dynamical Transitions in Marine Palaeoclimate Re...

By: K. Rehfeld; R. V. Donner; N. Marwan; J. Kurths; M. H. Trauth; J. F. Donges

Description: Potsdam Institute for Climate Impact Research, P.O. Box 601203, 14412 Potsdam, Germany. The analysis of palaeoclimate time series is usually affected by severe methodological problems, resulting primarily from non-equidistant sampling and uncertain age models. As an alternative to existing methods of time series analysis, in this paper we argue that the statistical properties of recurrence networks – a recently developed approach – are promising candida...

Abarbanel, H. D. I.: Analysis of Observed Chaotic Data (Springer, New York), 1996.; Babu, P. and Stoica, P.: Spectral analysis of nonuniformly sampled data – a review, Dig. Sign. Proc. 20, 359–378, 2010.; Barrio, R. and Serrano, S.: A three-parametric study of the Lorenz model, Physica D, 229, 43–51, 2007. {; Boccaletti, S., Latora, V., Moreno, Y., Chavez, M., and Hwang, D.: Complex networks: Structure and dynamics, Phys. Rep., 424, 175–308, 2006.}; Brockwell, P. J. and ...

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Recurrent Frequency-size Distribution of Characteristic Events : V...

By: J. B. Rundle; D. L. Turcotte; K. F. Tiampo; S. G. Abaimov

Description: Department of Earth Sciences, University of Western Ontario, London, Canada. Statistical frequency-size (frequency-magnitude) properties of earthquake occurrence play an important role in seismic hazard assessments. The behavior of earthquakes is represented by two different statistics: interoccurrent behavior in a region and recurrent behavior at a given point on a fault (or at a given fault). The interoccurrent frequency-size behavior has been investi...

Abaimov, S. G.: Critical behavior of slider-block model, arXiv:0902.3767, 2009.; Abaimov, S. G., Turcotte, D. L., and Rundle, J. B.: Recurrence-time and frequency-slip statistics of slip events on the creeping section of the San Andreas fault in central California, Geophys. J. Int., 170, 1289–1299, 2007a.; Abaimov, S. G., Turcotte, D. L., Shcherbakov, R., and Rundle, J. B.: Recurrence and interoccurrence behavior of self-organized complex phenomena, Nonlin. Processes Geo...

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Energetic Particle Cross-field Diffusion: Interaction with Magneti...

By: D. Winterhalter; G. S. Lakhina; R. Sukurai; C. Galvan; B. T. Tsurutani; J. K. Arballo

Description: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA. Magnetic field Decreases (MDs) are detected in the heliospheric polar regions. The MDs have minimum spatial scales sizes of 25 proton thermal gyroradii, and are typically bounded by tangential or rotational discontinuities. The distribution of the magnitudes of the decreases within AIDs is a continuum, with the smallest decreases being most frequent in occurrence. ...

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Lagrangian Predictability of High-resolution Regional Models: the ...

By: L. M. Ivanov; T. M. Margolina; L. H. Kantha; Y. A. Poberezhny; O. V. Melnichenko; P. C. Chu

Description: Naval Ocean Analysis and Prediction Laboratory, Department of Oceanography, Naval Postgraduate School, Monterey, California, 93943, USA. The Lagrangian prediction skill (model ability to reproduce Lagrangian drifter trajectories) of the nowcast/forecast system developed for the Gulf of Mexico at the University of Colorado at Boulder is examined through comparison with real drifter observations. Model prediction error (MPE), singular values (SVs) and irrev...

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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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Lagrangian Characteristics of Continental Shelf Flows Forced by Pe...

By: R. M. Samelson; B. T. Kuebel Cervantes; J. S. Allen

Description: College of Oceanic and Atmospheric Sciences, Oregon State Univ., 104 Ocean Admin. Bldg., Corvallis, OR, 97 331, USA. The coastal ocean may experience periods of fluctuating along-shelf wind direction, causing shifts between upwelling and downwelling conditions with responses that are not symmetric. We seek to understand these asymmetries and their implications on the Eulerian and Lagrangian flows. We use a two-dimensional (variations across-shelf and wit...

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A Tri-stage Cluster Identification Model for Accurate Analysis of ...

By: G. Panda; K. F. Tiampo; A. Mignan; L. Mansinha; N. Cho; S. J. Nanda

Description: School of Electrical Sciences, Indian Institute of Technology Bhubaneswar, Orissa, 751013, India. In this paper we propose a tri-stage cluster identification model that is a combination of a simple single iteration distance algorithm and an iterative K-means algorithm. In this study of earthquake seismicity, the model considers event location, time and magnitude information from earthquake catalog data to efficiently classify events as either background ...

Advanced National Seismic System: available at: http://www.ncedc.org/anss/catalog-search.html, last access: 15 August 2012.; Baiesi, M. and Paczuski M.: Scale-free networks of earthquakes and aftershocks, Phys. Rev., 1–7, doi:10.1103/PhysRevE.69.066106, 2004.; Bansal, A. R. and Ogata, Y.: Seismicity activation before the mega-earthquake of 26 December 2004 b...

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Intrinsic Low-frequency Variability of the Gulf Stream : Volume 19...

By: H. A. Dijkstra; G. Quattrocchi; S. Pierini

Description: Department of Environmental Sciences, University of Naples Parthenope, Naples, Italy. In this paper a process study aimed at analyzing the low-frequency variability of intrinsically oceanic origin of the Gulf Stream (GS) and GS extension (GSE) is presented. An eddy-permitting reduced-gravity nonlinear shallow water model is implemented in an idealized North Atlantic Ocean, with schematic boundaries including the essential geometric features of the coast...

Adcroft, A. and Marshall, D.: How slippery are piecewise-constant coastlines in numerical ocean models?, Tellus, 50A, 95–108, 1998.; Anishchenko, V. S., Astakhov, V., Neiman, A., Vadivasova, T., and Schimansky-Geier, L.: Nonlinear dynamics of chaotic and stochastic systems, Springer, 446 pp., 2007.; Auer, S. J.: Five-year climatological survey of the Gulf Stream system and its associated rings, J. Geophys. Res., 92, 11709–11726, 1987.; Bane, J. M. and Dewar, W. K.: Gulf ...

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Precision Variational Approximations in Statistical Data Assimilat...

By: P. J. Rozdeba; H. D. I. Abarbanel; N. Kadakia; J. Ye; J. C. Quinn

Description: Department of Physics, University of California, San Diego, La Jolla, CA 92093-0374, USA. Data assimilation transfers information from observations of a complex system to physically-based system models with state variables x(t). Typically, the observations are noisy, the model has errors, and the initial state of the model is uncertain, so the data assimilation is statistical. One can thus ask questions about expected values of...

Abarbanel, H. D.: Predicting the Future: Completing Models of Observed Complex Systems, Springer, New York, 2013.; Aguiar e Oliviera, H., Ingber, L., Petraglia, A., Petraglia, M. R., and Machado, M. A. S.: Stochastic Global Optimization and Its Applications with Fuzzy Adaptive Simulated Annealing, Vol. 35, Springer, New York, 2012.; Eibern, H. and Schmidt, H.: A four-dimensional variational chemistry data assimilation scheme for Eulerian chemistry transport modeling, J. ...

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Dynamics of Turbulence Under the Effect of Stratification and Inte...

By: L. A. Ostrovsky; O. A. Druzhinin

Description: The Institute of Applied Physics, Russian Acad. Sci., Nizhny Novgorod, Russia. The objective of this paper is to study the dynamics of small-scale turbulence near a pycnocline, both in the free regime and under the action of an internal gravity wave (IW) propagating along a pycnocline, using direct numerical simulation (DNS). Turbulence is initially induced in a horizontal layer at some distance above the pycnocline. The velocity and density fields of IW ...

Anis, A. and Moum, J. N.: Surface wave-turbulence interactions: scaling ϵ(z) near the sea surface, J. Phys. Oceanogr., 25, 2025–2045, 1995.; Carruthers, D. J. and Hunt, J. C. R.: Velocity fluctuations near an interface between a turbulent region and a stably stratified layer, J. Fluid Mech., 165, 475–501, 1986.; Druzhinin, O. A., Ostrovsky, L. A., and Zilitinkevich, S. S.: The study of the effect of small-scale turbulence on internal gravity waves propa...

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Plankton Blooms in Vortices: the Role of Biological and Hydrodynam...

By: C. López; E. Hernández-garcía; U. Feudel; M. Sandulescu

Description: Institute for Chemistry and Biology of the Marine Environment, Carl-von-Ossietzky Universität Oldenburg, 26111 Oldenburg, Germany. We study the interplay of hydrodynamic mesoscale structures and the growth of plankton in the wake of an island, and its interaction with a coastal upwelling. Our focus is on a mechanism for the emergence of localized plankton blooms in vortices. Using a coupled system of a kinematic flow mimicking the mesoscale structures b...

Abraham, E.: The generation of plankton patchiness by turbulent stirring, Nature, 391, 577–580, 1998.; Ar\'\istegui, J., Tett, P., Hernández-Guerra, A., Basterretxea, G., Montero, M. F., Wild, K., Sangrá, P., Hernández-Leon, S., Canton, M., Garc\'\ia-Braun, J. A., Pacheco, M., and Barton, E.: The influence of island-generated eddies on chlorophyll distribution: a study of mesoscale variation around Gran Canaria, Deep-Sea Res I, 44, 71–96, 1997.; Ar\'\istegui, J., Barton,...

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Inhomogeneous Dominance Patterns of Competing Phytoplankton Groups...

By: U. Feudel; D. Bastine

Description: Institute for Chemistry and Biology of the Marine Environment, Theoretical Physics/Complex Systems, Carl von Ossietzky University Oldenburg, Germany. We investigate the competition between two different functional groups of phytoplankton in the wake of an island close to a coastal upwelling region. We couple a simple biological model with three trophic levels and a hydrodynamic model of a von Kármán vortex street. The spatio-temporal abundance shows that...

Abraham, E. R.: The generation of plankton patchiness by turbulent stirring, Nature, 391, 577–580, 1998.; Aristegui, J., Tett, P., Hernández-Guerra, A., Basterretxea, G., Montero, M. F., Wild, K., Sangra, P., Hernández-Leon, S., Canton, M., Garc\'ia-Braun, J. A., Pacheco, M., and Barton, E. D.: The influence of island-generated eddies on chlorophyll distribution: A study of mesoscale variation around Gran Canaria, Deep-Sea Res. Part I-Oceanographic Research Papers, 44, 7...

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Comments and New Results About the Magnetospheric Chaos Hypothesis...

By: D. Diamantidis; M. A. Athanasiu; E. T. Sarris; G. P. Pavlos; A. G. Rigas

Description: Department of Electrical and Computer Engineering, Demokritos University of Thrace, 67100 Xanthi, Greece. In this study we present theoretical concepts and results concerning the hypothesis test of the magnetospheric chaos. For this reason we compare the observational behavior of the magnetospheric system with results obtained by analysing different types of stochastic and deterministic input-output systems. The results of this comparison indicate that ...

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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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