Comparative study of mixing and biological activity of the Benguela and Canary upwelling systems

Details Comparative study of mixing and biological activity of the Benguela and Canary upwelling systems Comparative study of mixing and biological activity of the Benguela and Canary upwelling systems

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3511602r&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 11, CiteID L11602

Mathematics

Logic

10

Oceanography: General: Physical And Biogeochemical Interactions, Oceanography: Biological And Chemical: Phytoplankton, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490), Oceanography: Physical: Eastern Boundary Currents, Oceanography: Physical: Eddies And Mesoscale Processes

Scientific paper

We present a comparative study of the horizontal mixing properties, from satellite derived data of the surface velocity field, of the two eastern boundary Canary and Benguela upwelling systems, based on a Finite Size Lyapunov Exponents analysis. Each area can be subdivided into two subsystems attending to their mixing activity values. These coincide nicely with distinct biological signatures. When investigating links with chlorophyll as a proxy for biological activity in these two upwelling systems, results show that surface horizontal stirring and mixing vary inversely with chlorophyll standing stocks. Ekman-transport induced upwelling exhibits a positive correlation with chlorophyll. These two findings are complementary since spatial structure in plankton distributions results from both dynamics of the 3D turbulent medium and of the marine ecosystem.

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