منابع مشابه
Stochastic parametrizations and model uncertainty in the Lorenz '96 system.
Simple chaotic systems are useful tools for testing methods for use in numerical weather simulations owing to their transparency and computational cheapness. The Lorenz system was used here; the full system was defined as 'truth', whereas a truncated version was used as a testbed for parametrization schemes. Several stochastic parametrization schemes were investigated, including additive and mu...
متن کاملResonant phenomena in extended chaotic systems subject to external noise : the Lorenz ’ 96 model case Jorge
We investigate the effects of a time-correlated noise on an extended chaotic system. The chosen model is the Lorenz’96, a kind of “toy” model used for climate studies. Through the analysis of the system’s time evolution and its time and space correlations, we have obtained numerical evidence for two stochastic resonance-like behavior. Such behavior is seen when both, the usual and a generalized...
متن کاملStanding Swells Surveyed Showing Surprisingly Stable Solutions for the Lorenz '96 Model
The Lorenz ’96 model is an adjustable dimension system of ODEs exhibiting chaotic behavior representative of the dynamics observed in the Earth’s atmosphere. In the present study, we characterize statistical properties of the chaotic dynamics while varying the degrees of freedom and the forcing. Tuning the dimensionality of the system, we find regions of parameter space with surprising stabilit...
متن کاملAvalanches, breathers, and flow reversal in a continuous Lorenz-96 model.
For the discrete model suggested by Lorenz in 1996, a one-dimensional long-wave approximation with nonlinear excitation and diffusion is derived. The model is energy conserving but non-Hamiltonian. In a low-order truncation, weak external forcing of the zonal mean flow induces avalanchelike breather solutions which cause reversal of the mean flow by a wave-mean flow interaction. The mechanism i...
متن کاملClassical Methods Tour of Advanced Data Assimilation using Lorenz ‘ 96 Model Final
Using Lorenz96 model with 40 variables, classical methods of advanced data assimilation are explained, implemented and examined. The classical methods include full Kalman filter (KF), extended Kalman filter (EKF), full Kalman smoother (KS), its iterative versions, and sawtooth algorithms (Johnston and Kurishnamurthy 2001). A brief explanation of the theoretical background of ensemble Kalman fil...
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ژورنال
عنوان ژورنال: International Journal of Bifurcation and Chaos
سال: 2019
ISSN: 0218-1274,1793-6551
DOI: 10.1142/s0218127419500081