Submesoscale activity over the Argentinian shelf

Details Submesoscale activity over the Argentinian shelf Submesoscale activity over the Argentinian shelf

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3515605c&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 15, CiteID L15605

Physics

2

Oceanography: Physical: Upper Ocean And Mixed Layer Processes, Oceanography: Physical: Fronts And Jets, Oceanography: Physical: Hydrodynamic Modeling, Oceanography: General: Continental Shelf And Slope Processes (3002)

Scientific paper

Submesoscale activity over the Argentinian shelf is investigated by means of high resolution primitive equation numerical solutions. These reveal energetic turbulent activity (visually similar to the one occasionally seen in satellite images) at scales O(5 km) in fall and winter that is linked to mixed layer baroclinic instability. The air-sea heat flux responsible for (i) deepening the upper ocean boundary layer (at these seasons) and (ii) maintaining a cross-shelf background density gradient is the key environmental parameter controlling submesoscale activity. Implications of submesoscale turbulence are investigated. Its mixing efficiency estimated by computing a diffusivity coefficient is above 30 m2 s-1 away from the shallowest regions. Aggregation of surface buoyant material by submesoscale currents occurs within hours and is presumably important to the ecosystem.

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