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New production stimulated by high-frequency winds in a turbulent mesoscale eddy field.

Abstract : Using an idealized model of an oligotrophic open-ocean region characterized by intense sub-mesoscale turbulence, we show that the presence of energetic near-inertial motions, forced by high-frequency winds, triggers transient nutrient inputs in the surface mixed-layer, stimulating new production. We also show that this production increase is larger than the increase due to the Ekman transport resulting from a slow-evolving wind forcing. The nutrient supplies are due to the interaction between near-inertial motions and the sub-mesoscale frontogenetic dynamics that reinforces both the vertical advection and vertical diffusion, especially within sub-mesoscales features. The net result is an uplift of new production from the subsurface to the mixed-layer. A direct consequence is that the sub-mesoscale filamentary patterns of phytoplankton should become much more observable from space in the presence of high-frequency winds.
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Contributor : Francoise Cudennec <>
Submitted on : Wednesday, June 16, 2021 - 5:04:20 PM
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Marina Lévy, Patrice Klein, Mahdi Ben Jelloul. New production stimulated by high-frequency winds in a turbulent mesoscale eddy field.. Geophysical Research Letters, American Geophysical Union, 2009, 36, pp.L16603. ⟨10.1029/2009GL039490⟩. ⟨hal-00413521⟩



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