title: Anomalous transport in Charney-Hasegawa-Mima flows.
abstract: The transport properties of particles evolving in a system governed by the Charney-Hasegawa-Mima equation are investigated. Transport is found to be anomalous with a nonlinear evolution of the second moments with time. The origin of this anomaly is traced back to the presence of chaotic jets within the flow. All characteristic transport exponents have a similar value around mu = 1.75, which is also the one found for simple point vortex flows in the literature, indicating some kind of universality. Moreover, the law gamma = mu + 1 linking the trapping-time exponent within jets to the transport exponent is confirmed, and an accumulation toward zero of the spectrum of the finite-time Lyapunov exponent is observed. The localization of a jet is performed, and its structure is analyzed. It is clearly shown that despite a regular coarse-grained picture of the jet, the motion within the jet appears as chaotic, but that chaos is bounded on successive small scales.
authors.affiliation: PIIM, Université, de Provence, CNRS, Centre Universitaire de Saint Jerome, F-13397 Marseilles, France. Xavier.Leoncini@cims.nyu.edu
authors.forename: Xavier
authors.initials: X
authors.lastname: Leoncini
authors.forename: Olivier
authors.initials: O
authors.lastname: Agullo
authors.forename: Sadruddin
authors.initials: S
authors.lastname: Benkadda
authors.forename: George M
authors.initials: GM
authors.lastname: Zaslavsky