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A Deterministic Width Function Model : Volume 10, Issue 6 (30/11/-...

By: B. Sivakumar; C. E. Puente

Description: Department of Land, Air & Water Resources, University of California, Davis, USA. Use of a deterministic fractal-multifractal (FM) geometric method to model width functions of natural river networks, as derived distributions of simple multifractal measures via fractal interpolating functions, is reported. It is first demonstrated that the FM procedure may be used to simulate natural width functions, preserving their most relevant features ...

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Self-organized Criticality in Solar Flares: a Cellular Automata Ap...

By: P. Charbonneau; L. F. Morales

Description: Canadian Space Agency, Saint-Hubert, Quebec, Canada. We give an overview of a novel lattice-based avalanche model that reproduces well a number of observed statistical properties of solar flares. The anisotropic lattice is defined as a network of vertically-connected nodes subjected to horizontal random displacements mimicking the kinks introduced by random motions of the photospheric footpoints of magnetic fieldlines forming a coronal loop. We focus he...

Aschwanden, M. J.: Physics of the solar corona, Springer-Praxis Books in Astronomy and Planetary Sciences, Chichester, UK, 2006.; Charbonneau, P., McIntosh, S. W., Liu, H.-L., and Bogdan, T. J.: Avalanche models for solar flares (Invited Review), Sol. Phys., 203, 321–353, 2001.; Aschwanden, M. J., Tarbell, T. D., Nightingale, R. W., Schrijver, C. J., Title, A., Kankelborg, C. C., Martens, P., and Warren, H. P.: Time Variability of the Quiet Sun Observed with TRACE. II. P...

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Nonlinear Wave-particle Interaction Upstream from the Earth's Bow ...

By: D. Le Quéau; C. Mazelle; K. Meziane

Description: Centre d'Etude Spatiale des Rayonnements, CNRS / Université Paul Sabatier, 31028 Toulouse, France. Well-defined ring-like backstreaming ion distributions have been recently reported from observations made by the 3DP/PESA-High analyzer onboard the WIND spacecraft in the Earth's foreshock at large distances from the bow shock, which suggests a local production mechanism. The maximum phase space density for these distributions remains localized at a nearly...

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The Effect of a Localized Geothermal Heat Source on Deep Water For...

By: E. Barsy; A. Várai; I. M. Jánosi; M. Vincze

Description: von Kármán Laboratory for Environmental Flows, Eötvös Loránd University, Pázmány P. s. 1/A, 1117 Budapest, Hungary. In a simplified two-dimensional model of a buoyancy-driven overturning circulation, we numerically study the response of the flow to a small localized heat source at the bottom. The flow is driven by differential thermal forcing applied along the top surface boundary. We evaluate the steady state solutions versus the temperature difference ...

Ganachaud, A. and Wunsch, C.: Improved estimates of global ocean circulation, heat transport and mixing from hydrographic data, Nature, 408, 453–457, 2000.; van Aken, H. M.: The Oceanic Thermohaline Circulation: An Introduction, Atmospheric and Oceanographic Sciences Library, 39, 121–151, doi:10.1007/978-0-387-48039-8-7, 2007.; Arakawa, A. and Lamb, V.: Computational design of the basic dynamical processes of the ...

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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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Statistical Analysis of Polychaete Population Density: Dynamics o...

By: F. G. Schmitt; J.-c. Dauvin; B. Quiroz-martinez

Description: Univ. Lille Nord de France, 59000 Lille, France. We consider here the dynamics of two polychaete populations based on a 20 yr temporal benthic survey of two muddy fine sand communities in the Bay of Morlaix, Western English Channel. These populations display high temporal variability, which is analyzed here using scaling approaches. We find that population densities have heavy tailed probability density functions. We analyze the dynamics of relative sp...

Arino, A. and Pimm, S. L.: On the nature of population extremes, Evolution. Ecol., 9, 429–443, 1995.; Banavar, J. R., Green, J. L., Harte, J., and Maritan, A.: Finite Size Scaling in Ecology, Phys. Rev. Lett., 83, 4212–4214, 1999.; Blarer, A. and Doebeli, M.:Resonance effects and outbreaks in ecological time series, Ecol. Lett., 2, 167–177, 1999.; Boyer, J. N., Kelble, C. R., Ortner, P. B., and Rudnick, D. T.: Phytoplankton bloom status: Chlorophyll a biomass as an indic...

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Dynamics of Nonlinear Resonant Slow Mhd Waves in Twisted Flux Tube...

By: R. Erdélyi; I. Ballai

Description: Space & Atmosphere Research Center (SPARC), Dept. of Applied Mathematics, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH, UK. Nonlinear resonant magnetohydrodynamic (MHD) waves are studied in weakly dissipative isotropic plasmas in cylindrical geometry. This geometry is suitable and is needed when one intends to study resonant MHD waves in magnetic flux tubes (e.g. for sunspots, coronal loops, solar plumes, solar ...

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Nonlinear Waves and Solitons Propagating Perpendicular to the Magn...

By: K. Sauer; G. Chanteur; J. F. McKenzie; E. M. Dubinin

Description: Max-Planck Institut für Aeronomie, Katlenburg-Lindau, Germany. We investigate the nature of nonlinear waves propagating transverse to the magnetic field in a bi-ion plasma including plasma pressure. By using the conservation laws derived from the multi-ion fluid equations the system may be described by a single order differential equation whose properties control the structure of the flow and the magnetic field. Compressive solitons exist...

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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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Conditioning Model Output Statistics of Regional Climate Model Pre...

By: Y. He; J. Freer; F. Pappenberger; F. Wetterhall; H. L. Cloke

Description: European Centre for Medium Range Weather Forecasts, Reading, UK. Dynamical downscaling of Global Climate Models (GCMs) through regional climate models (RCMs) potentially improves the usability of the output for hydrological impact studies. However, a further downscaling or interpolation of precipitation from RCMs is often needed to match the precipitation characteristics at the local scale. This study analysed three Model Output Statistics (MOS) techniq...

Bardossy, A. and Pegram, G.: Downscaling precipitation using regional climate models and circulation patterns toward hydrology, Water Resour. Res., 47, doi:10.1029/2010WR009689, 2011.; Bardossy, A. and Plate, E.: Space-time model for daily rainfall using atmospheric circulation patterns, Water Resour. Res., 28, 1247–1259, 1992.; Baur, F., Hess, P., and Nagel, H.: Kalender der Grosswetterlagen Europas 1881–1939, Bad Hombu...

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Large Eddy Simulation Model for Wind-driven Sea Circulation in Coa...

By: F. Roman; C. Nasello; A. Petronio; V. Armenio

Description: Dipartimento di Ingegneria e Architettura, Università di Trieste, Piazzale Europa 1, 34127 Trieste, Italy. In the present paper a state-of-the-art large eddy simulation model (LES-COAST), suited for the analysis of water circulation and mixing in closed or semi-closed areas, is presented and applied to the study of the hydrodynamic characteristics of the Muggia bay, the industrial harbor of the city of Trieste, Italy. The model solves the non-hydrostatic...

Armenio, V. and Roman, F.: Large Eddy Simulation of environmental shallow water coastal flow, Ercoftac Bulletin, 78, 46–53, 2009.; Balaras, E.: Modeling complex boundaries using an external force field on fixed Cartesian grids in large-eddy simulations, Comput. Fluids, 33, 375–404, 2004.; Burchard, H., Craig, P., Gemmrich, J., Haren, H. V., Mathieu, P., Meier, H. M., Smith, W. N., Prandke, H., Rippeth, T., Skyllingstad, E., Smyth, W., Welsh, D., and Wijesekera, H.: Obser...

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Improved Variational Methods in Statistical Data Assimilation : Vo...

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

Description: Department of Physics, University of California, San Diego, La Jolla, CA 92093-0374, USA. Data assimilation transfers information from an observed system to a physically based model system with state variables x(t). The observations are typically noisy, the model has errors, and the initial state x(t0) is uncertain: the data assimilation is statistical. One can ask about expected values of functions ⟨G(X...

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.; Bennett, A. F.: Inverse Modeling of the Ocean and Atmosphere, Cambridge University Press, 2002.; Eibern, H. and Schmidt, H.: A four-dimensio...

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Rank Ordering Multifractal Analysis of the Auroral Electrojet Inde...

By: P. De Michelis; G. Consolini

Description: INAF-Istituto di Fisica dello Spazio Interplanetario, 00133 Roma, Italy. In the second half of the 90s interest grew on the complex features of the magnetospheric dynamics in response to solar wind changes. An important series of papers were published on the occurrence of chaos, turbulence and complexity. Among them, particularly interesting was the study of the bursty and fractal/multifractal character of the high latitude energy release during geomagn...

Burlaga, M. F.: Multifractal structure of the interplanetary magnetic field – Voyager 2 observations near 25 AU, 1987–1988, Geophys. Res. Lett., 18, 69–72, 1991a.; Anh, V. V., Yong J. M., and Yu, Z. G.: Stochastic modeling of the auroral electrojet index, J. Geophys. Res., 113, A10215, doi:10.1029/2007JA012851, 2008.; Benzi, R., Paladin, G., Vulpiani, A., and Parisi, G.: On the multifractal nature of fully developed turb...

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Development of a Hybrid Variational-ensemble Data Assimilation Tec...

By: J. A. Knaff; M. Zupanski; M. Demaria; L. D. Grasso; K. Apodaca

Description: Colorado State University/Cooperative Institute for Research in the Atmosphere, Fort Collins, Colorado, USA. Lightning measurements from the Geostationary Lightning Mapper (GLM) that will be aboard the Geostationary Operational Environmental Satellite – R Series will bring new information that can have the potential for improving the initialization of numerical weather prediction models by assisting in the detection of clouds and convection through data ...

Adamo, C,. Goodman, S., Mugnai, A., and Weinman, J. A.: Lightning measurements from satellites and significance for storms in the Mediterranean, edited by: Betz, H. D., Schumann, U., and Laroche, P., Lightning Principles, Instruments and Applications: Review of Modern Lightning Research, Springer: Dordrecht, 309–329, 2009.; Alexander, G. D., Weinman, J. A., Karyampudi, V., Olson, W. S., and Lee, A. C. L.: The effect of assimilating rain rates derived from satellites and ...

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Singular Value Decomposition (Svd) for Extraction of Gravity Anoma...

By: Y. Q. Chen; B. B. Zhao

Description: School of Earth and Mineral Resource, China University of Geosciences, Beijing 100083, China. A singular value decomposition (SVD) program on MATLAB platform was effectively used to handle gravity signals for the Tongshi gold field. Firstly, the gravity signals were decomposed into different eigenimages with the help of singular value decomposition method (SVD). Secondly, the thresholds between the eigenvalues reflecting different layers of ore-controll...

Chen, Y. Q., Zhao, P. D., and Liu, H. G.: Accumulation and evolution of ore-forming composition of gold deposits in the western Shandong uplift terrain, J. China Univ. Geosci., 26, 41–48, 2001b.; Cheng, Q. M.: Mapping singularities with stream sediment geochemical data for prediction of undiscovered mineral deposits in Gejiu, Yunnan Province, China, Ore Geol. Rev., 32, 314–324, 2007.; Turcotte, D. L.: Fractals and chaos in geology and geophysics, 2nd edn, Canbridge Unive...

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Verification Against Perturbed Analyses and Observations : Volume ...

By: C. Piccolo; M. J. P. Cullen; N. E. Bowler

Description: Met Office, Fitzroy Road, Exeter, EX1 3PB, UK. It has long been known that verification of a forecast against the sequence of analyses used to produce those forecasts can under-estimate the magnitude of forecast errors. Here we show that under certain conditions the verification of a short-range forecast against a perturbed analysis coming from an ensemble data assimilation scheme can give the same root-mean-square error as verification against the trut...

Berre, L., Stefanescu, S., and Pereira, M.: The representation of the analysis effect in three error simulation techniques, Tellus A, 58, 196–209, 2006.; Bowler, N. E.: Explicitly accounting for observation error in categorical verification of forecasts, Mon. Weather Rev., 134, 1600–1606, 2006.; Bowler, N. E.: Accounting for the effect of observation errors on verification of MOGREPS, Meteorol. Appl., 15, 199–205, 2008.; Bowler, N. E., Arribas, A., Mylne, K. R., Robertso...

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Travelling Ionospheric Disturbance Over California Mid 2000 : Volu...

By: M. Hawarey

Description: Purdue University, West Lafayette, Indiana, USA. In this paper, the GPS data collected by more than 130 permanent GPS stations that belong to the Southern California Integrated GPS Network (SCIGN) around the launch of a Minuteman-II missile on 8 July 2000 (UTC) is processed to reveal traveling ionospheric disturbance (TID) all over the network on average 15 min after the launch. This TID was initially perceived to be excited by the launch itself, but th...

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Multifractal Analysis of Vertical Profiles of Soil Penetration Res...

By: J. Paz-ferreiro; G. M. Siqueira; E. Vidal Vázquez; A. A. A. Montenegro; E. F. F. Silva

Description: Department of Rural Technology, Federal Rural University of Pernambuco, Dom Manoel de Medeiros s/n, 52171-900 Recife-PE, Brazil. Soil penetration resistance (PR) is widely used as an indirect indicator of soil strength. Soil PR is linked to basic soil properties and correlated to root growth and plant production, and as such it is extensively used as a practical tool for assessing soil compaction and to evaluate the effects of soil management. This study...

Armstrong, A. C.: On the fractal dimensions of some transient soil properties, J. Soil Sci., 37, 641–652, 1986.; ASAE: Soil cone penetrometer, ASAE standards, American Soc. Agric. Eng., S313, 2, St. Joseph, MI, 466 pp., 1986.; Biswas, A., Zeleke, T. B., and Si, B. C.: Multifractal detrended fluctuation analysis in examining scaling properties of the spatial patterns of soil water storage, Nonlin. Processes Geophys., 19, 227–238,

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Seismic Tomography and Mixing in the Deep Earth : Volume 2, Issue ...

By: G. Pari; W. R. Peltier; A. M. Dziewonski

Description: Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada. Recently constructed tomographic models of the lateral heterogeneity of elastic properties in the Earth's mantle are contrasted in terms of their implications concerning the extent to which the endothermic phase transformation at 660 km depth is influencing the radial style of mixing. Previously published whole mantle and split mantle tomographic reconstructions, SH8/WMI3 and...

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Plankton Bloom Controlled by Horizontal Stirring : Volume 16, Issu...

By: I. Scheuring; Z. Neufeld; W. McKiver

Description: School of Mathematical Sciences & Complex and Adaptive Systems Laboratory, University College Dublin, Ireland. Here we show a simple mechanism in which changes in the rate of horizontal stirring by mesoscale ocean eddies can trigger or suppress plankton blooms and can lead to an abrupt change in the average plankton density. We consider a single species phytoplankton model with logistic growth, grazing and a spatially non-uniform carrying capacity. The ...

Bracco, A., Provenzale, A., and Scheuring, I.: Mesoscale vortices and the paradox of the plankton, Proc. R. Soc. Lond. B, 267, 1795–1800, 2000.; Abraham, E. R.: The generation of plankton patchiness by turbulent stirring, Nature, 391, 577–580, 1998.; Abraham, E. R., Law, C. S., Boyd, P. W., Lavender, S. J., Maldonado, M. T., and Bowie, A. R.: Importance of stirring in the development of an iron-fertilized phytoplankton bloom. Nature, 407, 727–730, 2000.; Amemiya, T., Eno...

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