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Evaluation of Empirical Mode Decomposition for Quantifying Multi-d...

By: D. P. Chambers

Description: College of Marine Science, University of South Florida, St. Petersburg, FL, USA. The ability of empirical mode decomposition (EMD) to extract multidecadal variability from sea level records is tested using three simulations: one based on a series of purely sinusoidal modes, one based on scaled climate indices of El Niño and the Pacific Decadal Oscillation (PDO), and the final one including a single month with an extreme sea level event. A...

Andrade, A. O., Nasuto, S., Kyberd, P., Sweeney-Reed, C. M., and Van Kanijin, F. R.: EMG signal filtering based on Empirical Mode Decomposition, Biomedical Signal Processing and Control, 1, 44–55, doi:10.1016/j.bspc.2006.03.003, 2006.; Becker, M., Karpytchev, M., and Lennartz-Sassinek, S.: Long-term sea level trends: natural or anthropogenic?, Geophys. Res. Lett., 41, 5571–5580, doi:

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Exact Theory for Localized Envelope Modulated Electrostatic Wavepa...

By: I. Kourakis; P. K. Shukla

Description: Institut für Theoretische Physik IV, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany. Abundant evidence for the occurrence of modulated envelope plasma wave packets is provided by recent satellite missions. These excitations are characterized by a slowly varying localized envelope structure, embedding the fast carrier wave, which appears to be the result of strong modulation of the wave amplitude. This modulation may...

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Inferring Internal Properties of Earth's Core Dynamics and Their E...

By: J. Aubert; A. Fournier

Description: Institut de Physique du Globe de Paris, UMR7154, INSU, CNRS – Université Paris-Diderot, PRES Sorbonne Paris Cité, 1 rue Jussieu, 75238 Paris cedex 5, France. Over the past decades, direct three-dimensional numerical modelling has been successfully used to reproduce the main features of the geodynamo. Here we report on efforts to solve the associated inverse problem, aiming at inferring the underlying properties of the system from the sole knowledge of su...

Aubert, J., Aurnou, J., and Wicht, J.: The magnetic structure of convection-driven numerical dynamos, Geophys. J. Int., 172, 945–956, doi:10.1111/j.1365-246X.2007.03693.x, 2008.; Aubert, J., Labrosse, S., and Poitou, C.: Modelling the palaeo-evolution of the geodynamo, Geophys. J. Int., 179, 1414–1428, doi:10.1111/j.1365-246X.2009.04361.x, 2009.; ...

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Barriers to Transport in Aperiodically Time-dependent Two-dimensio...

By: S. Wiggins; A. M. Mancho

Description: School of Mathematics, University of Bristol, Bristol BS8 1TW, UK. In this paper we consider fluid transport in two-dimensional flows from the dynamical systems point of view, with the focus on elliptic behaviour and aperiodic and finite time dependence. We give an overview of previous work on general nonautonomous and finite time vector fields with the purpose of bringing to the attention of those working on fluid transport from the dynamical systems p...

Acrivos, A., Aref, H., and Ottino, J. M. (Eds.): Symposium on Fluid Mechanics of Stirring and Mixing, Phys. Fluids A, Part 2, 723–1469, 1991.; Aref, H.: Stirring by chaotic advection, J. Fluid Mech., 143, 1–21, 1984.; Aref, H.: The development of chaotic advection, Phys. Fluids, 14, 1315–1325, 2002.; Aref, H. and El Naschie, M. S. (Eds.): Chaos Applied to Fluid Mixing, Chaos, Solitons, and Fractals, 4, 745–1116 , 1994.; Bower, A. S.: A simple kinematic mechanism for mixi...

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Gyrostatic Extensions of the Howard-krishnamurti Model of Thermal ...

By: A. Gluhovsky; C. Tong

Description: Biometrics Research RY33-300, Merck Research Laboratories, P.O.Box 2000, Rahway, NJ, 07065, USA. The Howard & Krishnamurti (1986) low-order model (LOM) of Rayleigh-Bénard convection with spontaneous vertical shear can be extended to incorporate various additional physical effects, such as externally forced vertical shear and magnetic field. Designing such extended LOMs so that their mathematical structure is isomorphic to those of systems of coupled gy...

Agee, E M.: Mesoscale cellular convection over the oceans, Dyn. Atmos. Oceans, 10, 317–341, 1987.; Atkinson, B W and Zhang, J W.: Mesoscale shallow convection in the atmosphere, Rev. Geophys., 34, 403–431, 1996.; Bénard, H and Avsec, D.: Travaux récents sur les tourbillons cellulaires et les tourbillons en bandes: applications à l'astrophysique et à la météorologie, J. Phys. Radium, 9, 486–500, 1938.; Brown, R A.: Longitudinal instabilities and secondary flows in the pla...

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Mfga-idt2 Workshop: Astrophysical and Geophysical Fluid Mechanics:...

By: D. Schertzer; E. Falgarone

Description: Laboratoire de Météorologie Dynamique, Université P. et M. Curie, case 99, 4 Pl. Jussieu, F-75252 Paris Cedex 05, France.

1 Facts about the Workshop

This workshop was convened on November 13-15 1995 by E. Falgarone and D. Schertzer within the framework of the Groupe de Recherche Mecanique des Fluides Geophysiques et Astrophysiques (GdR MFGA, Research Group of Geophysical and Astrophysical Fluid Mechanics) of Centre National de la Recherc...

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Current Challenges for Pre-earthquake Electromagnetic Emissions: S...

By: S. M. Potirakis; K. Eftaxias

Description: Department of Physics, Section of Solid State Physics, University of Athens, Panepistimiopolis, 15784, Zografos, Athens, Greece. Are there credible electromagnetic (EM) potential earthquake (EQ) precursors? This a question debated in the scientific community and there may be legitimate reasons for the critical views. The negative view concerning the existence of EM potential precursors is enhanced by features that accompany their observation which are co...

Alonso-Marroquin, F., Vardoulakis, I., Herrmann, H., Weatherley, D., and Mora, P.: Effect of rolling on dissipation in fault gouges, Phys. Rev. E, 74, 031306(1-10), doi:10.1103/PhysRevE.74.031306, 2006.; Amitrano, D. and Helmstetter, A.: Brittle creep, damage, and time to failure in rocks, J. Geophys. Res., 111, B11201(1-17), doi:10.1029/2005JB004252, 2006.; Andrad...

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Detecting Nonlinearity in Time Series Driven by Non-gaussian Noise...

By: L. Ridolfi; A. Porporato; S. Tamea; F. Laio

Description: Dip. Idraulica, Trasporti ed Infrastrutture Civili, Politecnico di Torino, Torino, Italy. Several methods exist for the detection of nonlinearity in univariate time series. In the present work we consider riverflow time series to infer the dynamical characteristics of the rainfall-runoff transformation. It is shown that the non-Gaussian nature of the driving force (rainfall) can distort the results of such methods, in particular when surrogate data tech...

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Time Series Segmentation with Shifting Means Hidden Markov Models ...

By: V. Fortin; Ath. Kehagias

Description: Aristotle University of Thessaloniki, School of Engineering, GR 541 24 Thessaloniki, Greece. We present a new family of hidden Markov models and apply these to the segmentation of hydrological and environmental time series. The proposed hidden Markov models have a discrete state space and their structure is inspired from the shifting means models introduced by Chernoff and Zacks and by Salas and Boes. An estimation method inspired from the EM alg...

Fortin, V., Perreault, L., and Salas, J. D.: Analyse rétrospective et prévision des débits en présence de changements de régime, 57th Annual meeting of the Canadian Water Resources Association, Montréal, June 16–18, 2004.; Hipel, A. I. and McLeod, K. W.: Time Series Modelling of Water Resources and Environmental Systems, Elsevier, 1994.; Hoppe, H. and Kiely, G.: Precipitation over Ireland – Observed changes since 1940, Phys. Chem. Earth (B), 24, 91–96, 1999.; Hubert, P.:...

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Dynamics of the Burning Model : Volume 12, Issue 5 (19/07/2005)

By: D. Coca; R. A. Treumann; M. Balikhin; M. Bregman; M. Gedalin; G. Consolini

Description: Ben-Gurion University, Beer-Sheva, Israel. We propose a new avalanching model which is characterized by a) a local threshold in the transition from passive to active states, b) finite life time of active sites, and c) is dissipative. This model seems to be more appropriate for the description of a continuous system where localized reconnection plays a crucial role. The model allows for an analytical treatment. We establish the shape of the distribution ...

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Multifractal Analysis for the Ulf Geomagnetic Data During the 1993...

By: M. Hayakawa; K. Gotoh; A. Adalev; Y. Ida

Description: Department of Electronic Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan. In our previous papers we have shown that the fractal (monofractal) dimension (Do) showed a significant increase before the Guam earthquake occurred on 8 August, 1993. In order to have a further support to this precursory effect to the general rupture (earthquake) we have carried out the corresponding multifract...

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Coronal Heating and Wind Acceleration by Nonlinear Alfvén Waves – ...

By: T. K. Suzuki

Description: School of Arts and Sciences, University of Tokyo, Komaba, Meguro, 153-8902 Tokyo, Japan. We review our recent results of global one-dimensional (1-D) MHD simulations for the acceleration of solar and stellar winds. We impose transverse photospheric motions corresponding to the granulations, which generate outgoing Alfvén waves. We treat the propagation and dissipation of the Alfvén waves and consequent heating from the photosphere by dynamical simulatio...

Chandran, B. D. G.: Weak Compressible Magnetohydrodynamic Turbulence in the Solar Corona Phys. Rev. Lett., 95, 265004, 2005.; Boynton, G. C. and Torkelsson, U.: Dissipation of nonlinear Alfvén waves, Astron. Astrophys., 308, 299–308, 1996.; Airapetian, V. S., Ofman, L., Robinson, R. D., Carpenter, K., and Davila, J.: Winds from Luminous Late-Type Stars. I. The Effects of Nonlinear Alfvén Waves, Astrophys. J., 528, 965–971, 2000.; Axford, W. I. and McKenzie, J. F.: The So...

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An Analytical Model of the Evolution of a Stokes Wave and Its Two ...

By: R. Y. Yang; H. H. Hwung; I. V. Shugan

Description: International Wave Dynamics Research Center, National Cheng Kung University, Tainan City, Taiwan. An analytical weakly nonlinear model of the Benjamin–Feir instability of a Stokes wave on nonuniform unidirectional current is presented. The model describes evolution of a Stokes wave and its two main sidebands propagating on a slowly varying steady current. In contrast to the models based on versions of the cubic Schrödinger equation, the current variation...

Benjamin, T. B. and Feir, J. E.: Instability of periodic wavetrains in nonlinear dispersive systems, J. Fluid Mech., 27, 417–430, 1967.; Bridges, T. and Dias, F.: Enhancement of the Benjamin-Feir instability with dissipation, Phys. Fluids, 19, 104–104, 2007.; Chavla, A. and Kirby, J.: Experimental study of breaking waves on a blocking current, Proc. 26th International Conference on Coastal Engineering, Copenhagen, 22–26 June, 759–772, 1998.; Chavla, A. and Kirby, J.: Mon...

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Can an Ensemble Give Anything More Than Gaussian Probabilities? : ...

By: J. C. W. Denholm-price

Description: School of Mathematics, Kingston University, Kingston upon Thames, KT1 2EE, UK. Can a relatively small numerical weather prediction ensemble produce any more forecast information than can be reproduced by a Gaussian probability density function (PDF)? This question is examined using site-specific probability forecasts from the UK Met Office. These forecasts are based on the 51-member Ensemble Prediction System of the European Centre for ...

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Dynamical Changes of the Polar Cap Potential Structure: an Informa...

By: M. F. Marcucci; G. Consolini; E. Amata; I. Coco; D. Ambrosino

Description: INAF-Istituto di Fisica dello Spazio Interplanetario, Via Fosso del Cavaliere, 100, 00133 Roma, Italy. Some features, such as vortex structures often observed through a wide spread of spatial scales, suggest that ionospheric convection is turbulent and complex in nature. Here, applying concepts from information theory and complex system physics, we firstly evaluate a pseudo Shannon entropy, H, associated with the polar cap potential obtained from ...

Consolini, G., Tozzi, R., and De Michelis, P.: Complexity in the sunspot cycle, Astron. Astrophys., 506, 1381–1391, 2009.; Consolini, G., Marcucci, M. F., and Candidi, M.: Multifractal structure of auroral electrojet index data, Phys. Rev. Lett., 76, 4082–4085, 1996.; Abel, G. A., Freeman, M. P., and Chisham, G.: IMF clock angle control of multifractality in ionospheric velocity fluctuations, Geophys. Res. Lett., 36, L19102,

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Lagrangian Transport in a Circular Lake: Effect of Nonlinearity an...

By: T. Sakai; L. G. Redekopp

Description: Department of Aerospace & Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1191, USA. Effects of the second vertical mode and nonlinearity of the background flow field on the Lagrangian transport of particle clouds are studied by employing a wind-forced linear hydrostatic model and a weakly-nonlinear, weakly-nonhydrostatic evolution model. It is confirmed that Kelvin waves primarily advect particles near the basin perimet...

Monismith, S.: Modal response of reservoirs to wind stress, J. Hydraul. Eng., 113, 1290–1306, 1987.; Horn, D. A., Imberger, J., and Ivey, G. N.: The degeneration of large-scale interfacial gravity waves in lakes, J. Fluid Mech., 434, 181–207, 2001.; Csanady, G. T.: Motions in a model Great Lake due to a suddenly imposed wind, J. Geophys. Res., 73, 6435–6447, 1968.; Csanady, G. T.: Response of large stratified lakes to wind, J. Phys. Oceanogr., 2, 3–13, 1972.; Csanady, G....

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Some Theoretical Models for Solitary Structures of Boundary Layer ...

By: S. V. Singh; R. V. Reddy; B. T. Tsurutani; G. S. Lakhina

Description: Indian Institute of Geomagnetism, Colaba, Mumbai, India. Solitary electrostatic structures have been observed in and around auroral zone field lines at various altitudes ranging from close to the ionosphere, to the magnetopause low-latitude boundary layer (LLBL) and cusp on the dayside, and to the plasma sheet boundary layer on the night-side. In this review, various models based on solitons/double layers and BGK modes or phase space ...

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Electron Acoustic Solitons in the Presence of an Electron Beam and...

By: G. S. Lakhina; S. V. Singh; R. Bharuthram; S. Devanandhan

Description: Indian Institute of Geomagnetism, New Panvel (West), Navi Mumbai, India. Arbitrary amplitude electron acoustic solitons are studied in an unmagnetized plasma having cold electrons and ions, superthermal hot electrons and an electron beam. Using the Sagdeev pseudo potential method, theoretical analysis is carried out by assuming superthermal hot electrons having kappa distribution. The results show that inclusion of an electron beam alters the minimum va...

Armstrong, T. P., Paonessa, M. T., Bell II, E. V., and Krimigis, S.M.: Voyager observations of Saturnian ion and electron phase space densities, J. Geophys. Res., 88, 8893–8904, 1983.; Berthomier, M., Pottelette, R., Malingre, M., and Khotyaintsev, Y.: Electron-acoustic solitons in an electron-beam plasma system, Phys. Plasmas, 7, 2987–2994, 2000.; Berthomier, M., Pottelette, R., Muschietti, L., Roth, I., and Carlson, C. W.: Scaling of 3D solitary waves observed by FAST ...

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A Nudging-based Data Assimilation Method: the Back and Forth Nudgi...

By: D. Auroux; J. Blum

Description: Institut de Mathématiques de Toulouse, Université Paul Sabatier Toulouse 3, 31062 Toulouse Cedex 9, France. This paper deals with a new data assimilation algorithm, called Back and Forth Nudging. The standard nudging technique consists in adding to the equations of the model a relaxation term that is supposed to force the observations to the model. The BFN algorithm consists in repeatedly performing forward and backward integrations of the model with rel...

Arnold, M. and Datta, B N.: Single-input eigenvalue assignment algorithms: A close look, SIAM J. Matrix Anal. Appl., 19(2), 444–467, 1998.; Auroux, D.: Etude de différentes méthodes d'assimilation de données pour l'environnement, Ph.D. thesis, University of Nice Sophia-Antipolis, 2003.; Auroux, D. and Blum, J.: Data assimilation methods for an oceanographic problem, vol. XVI of Mathematics in Industry Series: Multidisciplinary methods for analysis, optimization and contr...

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Brief Communication Spatial and Temporal Variation of Wind Power a...

By: G. J. Mayr; J. W. Messner; R. Stauffer; S. Gisinger

Description: Institute for Meteorology and Geophysics, University of Innsbruck, Austria. Wind power over Europe computed from two years of the new 100 m wind product from ECMWF at 16 km horizontal resolution is 20% of maximum capacity of an exemplary wind turbine power curve. This is five percent of maximum capacity less than extrapolated from 10 m winds using model roughness in the logarithmic law, but eight percent more than multiplying 10 m winds by a constant fa...

Baas, P., Bosveld, F. C., Klein Baltink, H., and Holtslag, A. A. M.: A Climatology of Nocturnal Low-Level Jets at Cabauw, J. Appl. Meteorol. Climatol., 48, 1627–1642, doi:10.1175/2009JAMC1965.1, 2009.; Boccard, N.: Capacity factor of wind power realized values vs. estimates, Energy Policy, 37, 2679–2688, doi:10.1016/j.enpol.2009.02.046, 2009.; Boccard, N.: Econo...

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