Nonlinear Processes in Oceanic and Atmospheric Flows

Presentation

Mixing, Lyapunov exponents, and biological activity in the Benguela and the Canary upwelling systems

Author: Emilio Hernandez-Garcia, IFISC (CSIC-UIB).

Names and affiliation of other authors:
V. Rossi (LEGOS/CNRS, Toulouse, France)
C. Lopez (IFISC/CSIC-UIB, Palma de Mallorca, Spain)
J. Sudre (LEGOS/CNRS, Toulouse, France)
V. Garçon (LEGOS/CNRS, Toulouse, France)

Oral or poster: Poster

Downloadable poster file:

Mixing, Lyapunov exponents, and biological activity in the Benguela and the Canary upwelling systems

(posterBenguelaCanary.pdf, 18801831 bytes)

Abstract:
A comparative study of the horizontal mixing properties of the two eastern boundary Canary and Benguela upwelling systems is presented. It is based on Finite Size Lyapunov Exponents obtained from satellite-derived velocity fields.
Each of the systems is subdivided into two regions attending to their mixing activity values, which coincide nicely with distinct biological activity. Surface horizontal stirring and mixing are inversely correlated with chlorophyll standing stocks. On the other hand, Ekman-transport induced upwelling exhibits a positive correlation with chlorophyll.

*Satellite images from NASA and ESA

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