On the use of Finite-Time Lyapunov Exponents and Vectors for direct assimilation of tracer images into ocean models

Olivier Titaud; Jean-Michel Brankart; Jacques Verron

doi:10.1111/j.1600-0870.2011.00533.x

On the use of Finite-Time Lyapunov Exponents and Vectors for direct assimilation of tracer images into ocean models

Tellus

Volume 63 (2011): Issue 5

By: Olivier Titaud, Jean-Michel Brankart and Jacques Verron

Open Access

|Jan 2011

Abstract

Satellite ocean tracer images, of sea surface temperature (SST) and ocean colour images, for example, show patterns like fronts and filaments that characterize the flow dynamics. These patterns can be described using Lagrangian tools such as Finite-Time Lyapunov Exponents (FTLE) or Finite-Time Lyapunov Vectors (FTLV). In recent years, several studies have investigated the possibility of directly assimilating structured data from satellite images into numerical models. In this paper, we exploit specific properties of FTLE and FTLV to define observation operators that can be used in a direct ocean tracer image assimilation scheme. In an idealized context, we show that high-resolution SST and ocean colour images can be exploited to correct velocity fields using FTLE or FTLV.

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Articles in this issue

DOI: https://doi.org/10.1111/j.1600-0870.2011.00533.x | Journal eISSN: 3035-9554

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Language: English

Page range: 1038 - 1051

Submitted on: Jan 31, 2011

Accepted on: Jun 21, 2011

Published on: Jan 1, 2011

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

© 2011 Olivier Titaud, Jean-Michel Brankart, Jacques Verron, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 63 (2011): Issue 5