Nonlinear Processes in Oceanic and Atmospheric Flows

Presentation

Statistical properties and robustness of dispersion from surface velocity data

Author: Ismael Hernandez-Carrasco, IFISC (UNIVERSIDAD ISLAS BALEARES-CSIC).

Names and affiliation of other authors:
Cristóbal López / IFISC (CSIC-UIB) Instituto de Fisica Interdisciplinar de Sistemas Complejos, Palma de Mallorca, Spain
Emilio Hernández-García / IFISC (CSIC-UIB),
Instituto de Fisica Interdisciplinar de Sistemas Complejos, Palma de Mallorca, Spain
A. Turiel / Institut de Cičncies del Mar (CSIC), Barcelona, Spain

Oral or poster: Poster

Downloadable poster file:

Statistical properties and robustness of dispersion from surface velocity data

(poster_nloa.pdf, 417574 bytes)

Abstract:
We have analyzed surface velocity data of the Mediterranean Sea as
obtained from a primitive equation circulation model.
We have computed the Finite Size Lyapunov Exponents (FSLEs) from
this data set, which provides a measure of oceanic horizontal stirring.
In order to study their robustness and other statistical properties, the
FSLEs are computed at different spatial resolutions, both above and below
that of the velocity field.
In particular we have analyzed: i) the robustness of the FSLEs by
introducing a small error in the velocity data, ii) the influence of the
eddy diffusivity in the filamental and vortex structures, and iii) the
multifractal character of the spatial distribution of the FSLEs.

*Satellite images from NASA and ESA

Nonlinear Processes in Oceanic and Atmospheric Flows. July 2-4, 2008. Castro Urdiales, Cantabria, Spain.