Prof. SERGEY PRANTS

Co-authors

Following

Followers

Research Focus & Metrics

Explore full metrics on Scilit

Academic Career Length

31Years (1996-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications

10 December 2014 in The European Physical Journal Special Topics

Journal Article

Chaotic Lagrangian transport and mixing in the ocean

SERGEY PRANTS

Dynamical systems theory approach has been successfully used in physical oceanography for the last two decades to study mixing and transport of water masses in the ocean. The basic theoretical ideas have been borrowed from the phenomenon of chaotic advection in fluids, an analogue of dynamical Hamiltonian chaos in mechanics. The starting point for analysis is a velocity field obtained by this or that way. Being motivated by successful applications of that approach to simplified analytic models of geophysical fluid flows, researchers now work with satellite-derived velocity fields and outputs of sophisticated numerical models of ocean circulation. This review article gives an introduction to some of the basic concepts and methods used to study chaotic mixing and transport in the ocean and a brief overview of recent results with some practical applications of Lagrangian tools to monitor spreading of Fukushima-derived radionuclides in the ocean.

1 January 2013 in Izvestiya, Atmospheric and Oceanic Physics

Journal Article

Lagrangian analysis of mixing and transport of water masses in the marine bays

The Lagrangian approach to studying the mixing and transport of a passive admixture in marine bays and gulfs based on the methods of a theory of dynamic systems is developed. This approach is...

24 February 2014 in Nonlinear Processes in Geophysics

Journal Article

Lagrangian study of surface transport in the Kuroshio Extension area based on simulation of propagation of Fukushima-derived radionuclides

SERGEY PRANTS

Maxim V. Budyansky

Michael Uleysky

Lagrangian approach is applied to study near-surface large-scale transport in the Kuroshio Extension area using a simulation with synthetic particles advected by AVISO altimetric velocity field. A material line technique is proposed and applied to find out the origin of water masses in cold-core cyclonic rings pinched off from the jet in summer 2011. Tracking and Lagrangian maps provide the evidence of cross-jet transport. Fukushima-derived caesium isotopes are used as Lagrangian tracers to study transport and mixing in the area a few months after the 11 March 2011 tsunami that caused heavy damage of the Fukushima Nuclear Power Plant (FNPP). Tracking maps are computed to trace the origin of water parcels with measured levels of ¹³⁴Cs and ¹³⁷Cs concentrations collected during two research vessel (R/V) cruises in June and July 2011 in the large area of the northwest Pacific (Kaeriyama et al., 2013; Buesseler et al., 2012). It is shown that Lagrangian simulations are useful for finding the surface areas that are potentially dangerous due to the risk of radioactive contamination. The results of simulation are supported by tracks of the surface drifters that were deployed in the area.

1 May 2014 in Izvestiya, Atmospheric and Oceanic Physics

Journal Article

Lagrangian fronts in the ocean

SERGEY PRANTS

Maxim V. Budyansky

Michael Uleysky

We introduce the concept of Lagrangian fronts (LFs) in the ocean and describe their importance for analyzing water mixing and transport and the specific features and differences from hydrological...

1 May 2003 in Journal of Experimental and Theoretical Physics

Journal Article

Fractals and chaotic scattering of atoms in the field of a standing light wave

V. Yu. Argonov

SERGEY PRANTS

The motion of a two-level atom with an internal degree of freedom that interacts with the field of a single-mode standing light wave in a high-Q cavity is treated as a scattering problem. At detunings between atomic and field resonances δ, atomic recoil frequencies α, initial atomic momenta ρ₀, and numbers of excitations N at which the semiclassical equations have chaotic solutions (in the sense of their exponential sensitivity to small changes in the initial conditions), atomic scattering is fractal with strongly pronounced self-similarity of the dependence of time T at which the atom leaves the cavity at its initial momentum; the fractal dimension of this curve is 1.84. In the chaotic regime, there are two infinite sets of atomic initial momenta for which T=∞ (in the idealized case of the absence of any loss). They correspond to separatrix-like trajectories along which the atom asymptotically approaches certain configuration space points and to the trajectories of infinitely long chaotic wandering of atoms in the cavity. These trajectories make up countable and uncountable fractals, respectively. Correlations between Rabi atomic oscillations and atomic motion can lead to Doppler-Rabi resonances, that is, deep oscillations of the internal energy of the atom, for large detunings δ that satisfy the condition |αρ ₀|≈|δ|.

14 June 2017 in Ocean Science

Journal Article

Lagrangian simulation and tracking of the mesoscale eddies contaminated by Fukushima-derived radionuclides

SERGEY PRANTS

Maxim V. Budyansky

Michael Y. Uleysky

A Lagrangian methodology is developed to simulate, track, document and analyze the origin and history of water masses in ocean mesoscale features. It aims to distinguish whether water masses inside the mesoscale eddies originated from the main currents in the Kuroshio–Oyashio confluence zone. By computing trajectories for a large number of synthetic Lagrangian particles advected by the AVISO velocity field after the Fukushima accident, we identify and track the mesoscale eddies which were sampled in the cruises in 2011 and 2012 and estimate their risk of being contaminated by Fukushima-derived radionuclides. The simulated results are compared with in situ measurements, showing a good qualitative correspondence.

About Me

Corresponding member of the Russian Academy of Sciences, Prof., Head Dept. of Ocean and Atmospheric Physics at the Pacific Oceanological Institute of Russian Academy of Sciences, Vladivostok, Russia. Sergey’s research activities include the quantum study of atom-light interactions, the investigation of sound propagation of the ocean using Hamiltonian mechanic methods, and the study of transport and mixing processes in geophysical flows using dynamical system theory methods. He received a PhD in Phys. and Math. in 1981 and a Dr. Sci. degree in 1992 from the Institute of Physics, Minsk, USSR. Sergey worked in the USA (Courant Institute of Mathematical Sciences, New York, and Institute for Pure and Applied Mathematics at University of California in Los Angeles) and gave lectures at Xi’an Jiao Tong University and the Nanjing University of Information Science and Technology, China. He has authored around 200 peer-reviewed articles in journals indexed in the Web of Science core collection and a few books with the present Hirsch citation index of 29. He is a member of editorial boards, i.e., the Journal of Russian Laser Research (Springer), the Journal of Environmental Accounting and Management (L& H Scientific Publishing), and the Russian Journal of Nonlinear Dynamics. He is the winner of the International Zaslavsky Award in nonlinear science and complexity (2014). In 2006, he was given an award in theoretical physics by the Far Eastern Branch of the Russian Academy of Sciences.

Prof. SERGEY PRANTS

Prof. SERGEY PRANTS

Research Focus & Metrics

Academic Career Length

Publication Type Breakdown

Representative Publications

About Me