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Particle-in-cell Simulations of a Lens on an F-plane : Volume 4, I...

By: C. E. Grosch; J. J. Holdzkom II.; A. D. Kirwan, Jr.

Description: Center for Coastal Physical Oceanography, Old Dominion University, Norfolk, Virginia, 23529 USA. A particle-in-cell ansatz for solving the Euler equations in a rotating frame is described. The approach is ideally suited for layered models of flows with sharp density and velocity fronts. The material and Coriolis accelerations in the Euler equations are solved at each particle while the gradient accelerations are evaluated on a grid and interpolated at e...

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An Extended Singular Spectrum Transformation (Sst) for the Investi...

By: N. Itoh; N. Marwan

Description: University of Potsdam Interdisciplinary Center for Dynamics of Complex Systems (DYCOS), Campus Golm, Building 14 Karl-Liebknecht-Str. 24, 14476, Potsdam, Germany. In this paper a change-point detection method is proposed by extending the singular spectrum transformation (SST) developed as one of the capabilities of singular spectrum analysis (SSA). The method uncovers change points related with trends and periodicities. The potential of the proposed meth...

Ashok, K., Guan, Z., and Yamagata, T.: Impact of the Indian Ocean Dipole on the relationship between the Indian Monsoon rainfall and ENSO, Geophys. Res. Lett, 26, 4499–4502, 2001.; Basseville, M. and Nikiforov, I.: Detection of abrupt changes, theory and application, Englewood Cliffs NJ, Prentice-Hall, 1993.; Behera, S. K., Luo, J. J., Masson, S., Delecluse, P., Gualdi, S., Navarra, A., and Yamagata, T.: Paramount impact of the Indian Ocean Dipole on the East African sho...

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The Evolution of Electron Current Sheet and Formation of Secondary...

By: S. Wang; Z. Yang; M. Wu; C. Huang; Q. Dong; Q. Lu

Description: CAS Key Laboratory of Basic Plasma Physics, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei 230026, China. Two-dimensional (2-D) particle-in-cell (PIC) simulations are performed to investigate the evolution of the electron current sheet (ECS) in guide field reconnection. The ECS is formed by electrons accelerated by the inductive electric field in the vicinity of the X line, which is then extended alon...

Birdsall, C. K. and Langdon, A. B.: Plasma Physics via Computer Simulation, Mcgraw-Hill Book Company, 1985.; Biskamp, D.: Magnetic Reconnection in Plasmas, Cambridge Univ. Press, Cambridge, UK, 2000.; Daughton, W.: Surprising new results on the structure of the diffusion region, Eos Trans. AGU, 88, Jt. Assem. Suppl., Abstract SM53C-04, 2007.; Birn, J., Drake, J. F., Shay, M. A., Rogers, B. N., Denton, R. E., Hesse, M., Kuznetsova, M., Ma, Z. W., Bhattacharjee, A., Otto, ...

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Implicit Particle Filtering for Models with Partial Noise, and an ...

By: A. J. Chorin; M. Morzfeld

Description: Lawrence Berkeley National Laboratory, Berkeley, CA, USA. Implicit particle filtering is a sequential Monte Carlo method for data assimilation, designed to keep the number of particles manageable by focussing attention on regions of large probability. These regions are found by minimizing, for each particle, a scalar function F of the state variables. Some previous implementations of the implicit filter rely on finding the Hessians of these funct...

Evensen, G.: Data assimilation, Springer, 2007.; Doucet, A., de Freitas, N., and Gordon, N.: Sequential {M}onte {C}arlo methods in practice, Springer, 2001.; Arulampalam, M. S., Maskell, S., Gordon, N., and Clapp, T.: A tutorial on particle filters for online nonlinear/non-{G}aussian {B}ayesian tracking, IEEE Trans. Signal Process., 50, 174–188, 2002.; Atkins, E., Morzfeld, M., and Chorin, A. J.: The implicit particle filter and its connection to variational data assimil...

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Inverse Modelling of Atmospheric Tracers: Non-gaussian Methods and...

By: M. Bocquet

Description: Université Paris-Est, CEREA, Research and Teaching Centre in Atmospheric Environment, Joint laboratory École Nationale des Ponts et Chaussées / EDF R&D, avenue Blaise Pascal, 77455 Champs sur Marne, France. For a start, recent techniques devoted to the reconstruction of sources of an atmospheric tracer at continental scale are introduced. A first method is based on the principle of maximum entropy on the mean and is briefly reviewed here. A second approac...

Bocquet, M.: Grid resolution dependence in the reconstruction of an atmospheric tracer source, Nonlin. Processes Geophys., 12, 219–234, 2005a.; Bocquet, M.: Reconstruction of an atmospheric tracer source using the principle of maximum entropy, I: Theory, Q. J. Roy. Meteor. Soc., 131, 2191–2208, 2005b.; Bocquet, M.: Reconstruction of an atmospheric tracer source using the principle of maximum entropy, II: Applications, Q. J. Roy. Meteor. Soc., 131, 2209–2223, 2005c.; Bocq...

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