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Stability and Nonlinear Regimes of Flow Over a Saturated Porous Me...

By: D. T. Baydina; D. V. Lyubimov; T. P. Lyubimova

Description: Institute of Continuous Media Mechanics, Ural Branch of RAS, Perm, Russia. The paper deals with the investigation of stability and nonlinear regimes of flow over the saturated porous medium applied to the problem of stability of water flow over the bottom covered with vegetation. It is shown that the velocity profile of steady plane-parallel flow has two inflection points, which results in instability of this flow. The neutral stability curves, the depe...

Chang, M. H., Chen, F., and Straughan, B.: Instability of Poiseuille flow in a fluid overlying a porous layer, J. Fluid Mech., 564, 287–303, doi:10.1017/S0022112006001583, 2006.; Chen, F. and Chen, C. F.: Onset of finger convection in a horizontal porous layer underlying a fluid layer, Heat Transf., 110, 403–409, doi:10.1115/1.3250499, 1988.; Ghisalberti, M. and Nepf, ...

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Artificial Neural Networks to Reconstruct Incomplete Satellite Dat...

By: M. Volta; F. Pastor; E. Pisoni

Description: Department of Electronic for Automation, University of Brescia, Via Branze 38, 25123 Brescia, Italy. Satellite data can be very useful in applications where extensive spatial information is needed, but sometimes missing data due to presence of clouds can affect data quality. In this study a methodology for pre-processing sea surface temperature (SST) data is proposed. The methodology, that processes measures in the visible wavelength, is based on an Artif...

Acock, M C.: Estimating Missing Weather Data for Agricultural Simulations Using Group Method of Data Handling, J. Appl. Meteorol., 39, 1176–1184, 2000.; Beckers, J M. and Rixen, M.: EOF Calculations and Data Filling from Incomplete Oceanographic Datasets, J. Atmos. Ocean. Tech., 20, 1839–1856, 2003.; Bishop, C M.: Neural networks for pattern recognition, Oxford University Press, 1995.; Dirks, K N., Johns, M D., Hay, J E., and Sturman, A P.: A simple semi-empirical model ...

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Double Rank-ordering Technique of Roma (Rank-ordered Multifractal ...

By: T. Chang; S. W. Y. Tam

Description: Institute of Space, Astrophysical and Plasma Sciences, National Cheng Kung University, Tainan, Taiwan. Rank-Ordered Multifractal Analysis (ROMA), a technique capable of deciphering the multifractal characteristics of intermittent fluctuations, was originally applied to the results of a magnetohydrodynamic (MHD) simulation. Application of ROMA to measured fluctuations in the auroral zone, due to the dominant physical effects changing from kinetic to MHD ...

Burlaga, L.: Intermittent turbulence in the solar wind, J. Geophys. Res., 96, 5847–5851, 1991.; Bruno, R., Carbone, V., Veltri, P., Pietropaolo, E., and Bavassano, B.: Identifying intermittent events in the solar wind, Planet. Space Sci., 49, 1201–1210, 2001.; Chang, T., Tam, S. W. Y., and Wu, C. C.: Complexity induced anisotropic bimodal intermittent turbulence in space plasmas, Phys. Plasmas, 11, 1287–1299, 2004.; Chang, T.: Colloid-like behavior and topological phase ...

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Semi-automated Extraction of Deviation Indexes (Di) from Satellite...

By: N. Casagli; D. Tapete; F. Cigna

Description: Department of Earth Sciences, University of Florence, Via La Pira 4, 50121 Florence, Italy. We develop a methodology based on satellite Persistent Scatterers (PS) time series and aimed to calculate two indexes which are capable to depict the deviation from a deformation model defined a priori. Through a simple mathematical approach, these indexes reproduce the visual process of identification of trend deviations that is usually performed manually by the ...

Berardino, P., Fornaro, G., Lanari, R., and Sansosti, E.: A New Algorithm for Surface Deformation Monitoring Based on Small Baseline Differential SAR Interferograms, IEEE T. Geosci. Remote, 40, 2375–2383, 2002.; Bianchini, S., Cigna, F., Righini, G., Proietti, C., and Casagli, N.: Landslide HotSpot Mapping by means of Persistent Scatterer Interferometry, Environ. Earth Sci., 67, 1155–1172, doi:10.1007/s12665-012-1559-5<...

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Possible Link Between Holocene East Asian Monsoon and Solar Activi...

By: Y. X. Li; Z. S. Lin; H. Yang; X. Z. Qi; J. Shen; M. T. Yu; H. Y. Liu

Description: College of Geography Science, Nanjing Normal University, Nanjing, 210046, China. It is thought that East Asian monsoon (EAM) is linked and sensitive to solar activity. In this paper, we have decomposed the Dongge cave speleothem Δ18O record (proxy for EAM), and Δ14C and 10Be (proxies for solar activity) time series into variations at different time scales with the empirical mode decomposition (EMD) method to reveal the ...

Lin, Z. S. and Wang, S. G.: EMD Analysis of Solar Insolation, Meteorol. Atmos. Phys., 93, 1871–1893, 2006.; Agnihotri, R., Dutta, K., Bhushan, R., and Somayajulu, B.: Evidence for solar forcing on the Indian monsoon during the last millennium, Earth. Planet. Sci. Lett., 198, 521–527, 2002.; Asmerom, Y., Polyak, V., Burns, S., and Rasmussen, J.: Solar forcing of Holocene climate: New insights from a speleothem record, southwestern United States, Geology, 35, 1–4, 2007.; B...

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Multifractal Detrended Fluctuation Analysis in Examining Scaling P...

By: B. C. Si; T. B. Zeleke; A. Biswas

Description: CSIRO Land and Water, Canberra, Acton, ACT, 2601, Australia. Knowledge about the scaling properties of soil water storage is crucial in transferring locally measured fluctuations to larger scales and vice-versa. Studies based on remotely sensed data have shown that the variability in surface soil water has clear scaling properties (i.e., statistically self similar) over a wider range of spatial scales. However, the scaling property of soil water storage...

Bhattacharaya, R. N., Gupta, V. K., and Waymire, E. C.: The Hurst effect under trends, J. App. Probab., 20, 649–662, 1983.; Arneodo, A., Audit, B., Decoster, N., Muzy, J. F., and Vaillant, C.: Wavelet based multifractal formalism: Application to DNA sequence, satellite images of cloud structure, and stock market data, in: The Science of Disasters, edited by: Bunde, A., Kropp, J., and Schellnhuber, H. J., Springer-Verlag, NY, 29 pp., 2002.; Biswas, A. and Si, B. C.: Scale...

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Dissipation and Wave-ion Interaction in the Solar Wind: Links Betw...

By: E. Marsch

Description: Max-Planck Institut für Aeronomie, Max-Planck-Str. 2, D-37191 Katlenburg-Lindau, Germany. In this paper we establish links between turbulence dissipation and wave-particle interactions in the solar corona and wind. Based on quasilinear theory, a set of anisotropic, multi-component fluid equations is derived, which describe the wave-particle interactions of ions with Alfvén waves and ion-cyclotron waves or magnetosonic waves propagating along the mean ma...

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Linear and Nonlinear Modulus Surfaces in Stress Space, from Stress...

By: I. B. Santos; K. R. McCall; R. A. Guyer; G. N. Boitnott; M. Boudjema

Description: Department of Physics, University of Nevada, Reno, USA. The elastic response of many rocks to quasistatic stress changes is highly nonlinear and hysteretic, displaying discrete memory. Rocks also display unusual nonlinear response to dynamic stress changes. A model to describe the elastic behavior of rocks and other consolidated materials is called the Preisach-Mayergoyz (PM) space model. In contrast to the traditional analytic ap...

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Nonlinear Evolution of the Parametric Instability: Numerical Predi...

By: F. Malara; P. Veltri; L. Primavera

Description: Dipartimento di Fisica, Università della Calabria, and Istituto Nazionale per la Fisica della Materia, Unità di Cosenza, I-87030 Arcavacata di Rende, Italy.. Low-frequency turbulence in the solar wind is characterized by a high degree of Alfvénicity close to the Sun. Cross-helicity, which is a measure of Alfvénic correlation, tends to decrease with increasing distance from the Sun at high latitudes as well as in slow-speed streams at low lati...

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Projection of Compact Fractal Sets: Application to Diffusion-limit...

By: F. Maggi

Description: Berkeley Water Center, Civil and Environmental Engineering, 413 O'Brien Hall, University of California, Berkeley, CA 94720-1710, USA. The need to assess the three-dimensional fractal dimension of fractal aggregates from the fractal dimension of two-dimensional projections is very frequent in geophysics, soil, and atmospheric sciences. However, a generally valid approach to relate the two- and three-dimensional fractal dimensions is missing, thus question...

Coleman P. and Pietronero L.: The fractal structure of the Universe, Phys. Rep. 213, 311–389, 1992.; Friedlander S. K.: Smoke, Dust and Haze, fundamentals of aerosol behavior. Wiler, New York, 1977.; Grassberger H. G. E. and Procaccia I.: Characterization of strange attractors, Phys. Rev. Lett. 50(5), 346–349, 1983.; Hunt B. R. and Kaloshin V. Y.: How projections affect the dimension spectrum of fractal measures, Nonlinearity 10, 1031–1046, 1997.; Kranenburg C.: On the f...

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A Study of Magnetic Fluctuations and Their Anomalous Scaling in th...

By: A. Balogh; C. Pagel

Description: The Blackett Laboratory, Imperial College, London, UK. The solar wind is a highly turbulent and intermittent medium at frequencies between 10-4 and 10-1 Hz. Power spectra are used to look at fluctuations in the components of the magnetic field at high frequencies over a wide range of latitudes. Results show steady turbulence in the polar regions of the Sun and a more varied environment in the equatorial region. The m...

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Heliospheric Pick-up Ions Influencing Thermodynamics and Dynamics ...

By: D. Rucinski; H. J. Fahr

Description: Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany. Neutral interstellar H-atoms penetrate into the inner heliosphere and upon the event of ionization are converted into pick-up ions (PUIs). The magnetized solar wind flow incorporates these ions into the plasma bulk and enforces their co-motion. By nonlinear interactions with wind-entrained Alfvén waves, these ions are t...

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Baroclinic Instability of a Symmetric, Rotating, Stratified Flow: ...

By: A. Speranza; R. Mantovani

Description: Mathematics Department, University of Camerino, Via Madonna delle Carceri, 62032 Camerino (MC), Italy. This paper presents the analysis of symmetric circulations of a rotating baroclinic flow, forced by a steady thermal wind and dissipated by Laplacian friction. The analysis is performed with numerical time-integration. Symmetric flows, vertically bound by horizontal walls and subject to either periodic or vertical wall lateral boundary c...

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Granular Flow in Equilibrium with the Bottom: Experimental Analysi...

By: A. Lamberti; B. Zanuttigh

Description: DISTART - Universitá di Bologna Viale del Risorgimento 2, 40136 BOLOGNA, Italy. The paper presents measurements performed on the granular flow that develops in a drum partially filled with sand grains and rotating at various speeds. The aims of the paper are: to provide experimental evidence and measurements on grain flow in a drum; to compare theoretical and experimental velocity profiles; to point out discrepancies among theory and expe...

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The Local Ensemble Transform Kalman Filter and the Running-in-plac...

By: J. A. Carton; B. R. Hunt; T. Miyoshi; K. Ide; S. G. Penny; G. A. Chepurin; E. Kalnay

Description: Applied Mathematics and Scientific Computation, University of Maryland, College Park, Maryland, USA. The most widely used methods of data assimilation in large-scale oceanography, such as the Simple Ocean Data Assimilation (SODA) algorithm, specify the background error covariances and thus are unable to refine the weights in the assimilation as the circulation changes. In contrast, the more computationally expensive Ensemble Kalman Filters (EnKF) such as...

Bishop, C. H., Etherton, B. J., and Majumdar, S. J.: Adaptive Sampling with Ensemble Transform Kalman Filter, Part I: Theoretical Aspects, Mon. Weather Rev., 129, 420–436, 2001.; Bloom, S. C., Takacs, L. L., da Silva, A. M., and Ledvina, D.: Data Assimilation using Incremental Analysis Updates, Mon. Weather Rev., 124, 1256–1271, 1996.; Boyer, T. P., Antonov, J. I., Garcia, H., Johnson, D. R., Locarnini, R. A., Mishonov, A. V., Pitcher, T., Baranova, O. K., and Smolyar, I...

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Experimental Study of Nonlinear Interaction of Plasma Flow with Ch...

By: J. Buechner; M. F. Marcucci; M. Dunlop; J. Blecki; H. Rème; M. André; J. G. Trotignon; S. Savin; A. Skalsky; J. L. Rauch; S. Romanov; A. Fazakerley; Y. Khotyaintsev; P. M. E. Décréau; E. Amata; Y. V. Bogdanova

Description: Istituto di Fisica dello Spazio Interplanetario, INAF, Via del fosso del cavaliere 100, 00133 Roma, Italy. We study plasma transport at a thin magnetopause (MP), described hereafter as a thin current sheet (TCS), observed by Cluster at the southern cusp on 13 February 2001 around 20:01 UT. The Cluster observations generally agree with the predictions of the Gas Dynamic Convection Field (GDCF) model in the magnetosheath (MSH) up to the MSH boundary layer,...

André, M., Vaivads, A., Buchert, S. C., Fazakerley, A. N., and Lahiff, A.: Thin electron-scale layers at the magnetopause, Geophys. Res. Lett., 31, L03803, doi:10.1029/2003GL018137, 2004.; Balogh, A., Carr, C. M., AcuÑa, M. H., Dunlop, M. W., Beek, et al.: The Cluster magnetic field investigation: overview of in-flight performance and initial results, Ann. Geophys., 19, 1207–1217, 2001.; Belmont, G. and Rezeau, L.: Magnetopause reconnection induced by Hall-MHD fluctuatio...

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Large- and Small-scale Turbulent Spectra in Mhd and Atmospheric Fl...

By: A. Eidelman; E. Golbraikh; O. G. Chkhetiani

Description: Space Research Institute, Russian Academy of Sciences, Profsoyuznaya str., 84/32 Moscow 117810, Russia. In the present review we discuss certain studies of large- and small-scale turbulent spectra in MHD and atmospheric flows performed by S. S. Moiseev and his co-authors during the last years of his life and continued by his co-authors after he passed away. It is shown that many ideas developed in these works have not lost their novelty and urgency until...

Alemany, A., Moreau, R., Sulem, P. L., and Frisch, U.: Influence of an external magnetic field on homogeneous MHD turbulence, J. de Mecanique, 18, 277–313, 1979.; Batchelor, G. K.: Computation of the energy spectrum in homogeneous two-dimensional turbulence, Phys. Fluids, 12, 233–239, 1969.; Belyan, A. V., Moiseev, S. S., and Chkhetiani, O. G.: On eddy viscosity in helical turbulence, Physics – Doklady, 39, 13–15, 1994.; Belyan, A. V., Golbraikh, E. I., Moiseev, S. S., a...

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Nonlinear Interaction Between Acoustic Gravity Waves in a Rotating...

By: L. Stenflo; J. Larsson; P. Axelsson

Description: Department of Plasma Physics, Umeå University, S-90187 Umeå, Sweden. The influence of the Earth's rotation on the resonant interaction of atmospheric waves is investigated. The explicit expressions for the coupling coefficients are presented. They are derived by means of two different techniques; first, by a direct expansion derivation from a set of reduced equations, and second, by a Hamiltonian method.

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Discerning Connectivity from Dynamics in Climate Networks : Volume...

By: M. Vejmelka; D. Hartman; J. Hlinka; M. Paluš

Description: Institute of Computer Science, Academy of Sciences of the Czech Republic, Pod Vodárenskou věží 2, 182 07 Prague 8, Czech Republic. The bias due to dynamical memory (serial correlations) in an association/dependence measure (absolute cross-correlation) is demonstrated in model data and identified in time series of meteorological variables used for construction of climate networks. Accounting for such bias in inferring links of the climate network marked...

Bard, E. and Frank, M.: Climate change and solar variability: What's new under the sun?, Earth Planet. Sci. Lett., 248, 1–14, doi:10.1016/j.epsl.2006.06.016, 2006.; Barreiro, M., Marti, A. C., and Masoller, C.: Inferring long memory processes in the climate network via ordinal pattern analysis, Chaos, 21, 013101, doi:10.1063/1.3545273, 2011.; Boccaletti, S., Latora, V...

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An Inkling of the Relation Between the Monofractality of Temperatu...

By: S. Nicolay; A. Deliège

Description: University of Liège, Institut de Mathématiques, Quartier Polytech 1, Allée de la Découverte 12, 4000 Liège, Belgium. We use the discrete wavelet transform microscope to study the monofractal nature of surface air temperature signals of weather stations spread across Europe. This method reveals that the information obtained in this way is richer than previous works studying long range correlations in meteorological stations: the approach presented h...

Abry, P., Wendt, H., Jaffard, S., Helgason, H., Goncalves, P., Pereira, E., Charib, C., Gaucherand, P., and Doret, M.: Methodology for multifractal analysis of heart rate variability: from LF/HF ratio to wavelet leaders, in: Nonlinear Dynamic Analysis of Biomedical Signals EMBC conference (IEEE Engineering in Medicine and Biology Conferences), 31 Augst 2010–4 September 2010, Buenos Aires, 106–109, 2010.; Arneodo, A., Bacry, E., and Muzy, J.: The thermodynamics of fractal...

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