Nonlinear Processes in Oceanic and Atmospheric Flows


Lagrangian Stochastic Models for a sea-surface transport prediction system of the Catalan-Balearic Sea: A first stage test of some LSM’s with stochastic flows and a first evaluation of the sea dispers

Author: R. Madrigal, Laboratori d'Enginyeria Marítima/Universitat Politècnica de Catalunya.

Names and affiliation of other authors:
M. Dentz (a), G. Jorda (b) and M. Espino (c)
(a) Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia, Barcelona, Spain.
(b) Natural Resources Department, Mediterranean Institute for Advanced Studies, Illes Balears, Spain.
(c) Laboratory of Maritime Engineering, Technical University of Catalonia, Barcelona, Spain.

Oral or poster: Poster

An adequate prediction of Lagrangian material transport at the first layer of the ocean (pollutants, shipwrecked persons, etc.) is one of the most important tasks of the Ocean Operational Systems. At sea surface, Lagrangian dynamics is due mainly to winds and currents. Operationally, the estimation of these forcings implies important simplifications which can produce important deviations in the Lagrangian prediction of the transport. Thus it is necessary to model, in some other way, the Lagrangian transport behaviours that can not be well described with available estimated forcings. Several stochastic models have shown good applicability in transport prediction at mesoscale open sea ranges, but operational systems have to respond questions at submesoscale ranges near to the coast. Towards to have more representative tools, it is necessary to evaluate the performance of this type of models in those environments and scales. Here it is conducted a first stage test of two specific types of the so-called Lagrangian Stochastic Models (LSM): Markovian single particle and multiparticle. Up to date the test has been carried out using two types of stochastic turbulent flows: homogeneous isotropic and anisotropic. The test has been mainly directed to learn about the ability of the LSM’s to simulate some basic statistical dispersion and diffusion patterns exhibited by ensembles of numerical particles delivered in many realizations of those flows, for several levels of “turbulence”.

Formatted version of the abstract or additional information

*Satellite images from NASA and ESA

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