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SUMMARY:Do waves really matter for submesoscale lateral dispersion? - Mari
 e-Pascale Lelong (NorthWest Research Associates\, USA\, University of Wash
 ington)
DTSTART:20220519T080000Z
DTEND:20220519T090000Z
UID:TALK173570@talks.cam.ac.uk
DESCRIPTION:Submesoscale lateral transport of Lagrangian particles in ocea
 n pycnocline conditions is investigated by&nbsp\;means of idealized numeri
 cal simulations with reduced-interaction models. Using a projection techni
 que\,&nbsp\;the models are formulated in terms of wave-mode and vortical-m
 ode nonlinear interactions\, and they&nbsp\;range in complexity from full 
 Boussinesq to waves-only and vortical-modes-only (QG) models. We find&nbsp
 \;that\, on these scales\, most of the dispersion is done by vortical moti
 ons\, but waves cannot be discounted&nbsp\;because they play an important\
 , albeit indirect\, role. In particular\, we show that waves are instrumen
 tal in&nbsp\;filling out the spectra of vortical-mode energy at smaller sc
 ales through nonresonant vortex&ndash\;wave&ndash\;wave&nbsp\;triad intera
 ctions. We demonstrate that a richer spectrum of vortical modes in the pre
 sence of waves&nbsp\;enhancesthe effective lateral diffusivity\, relative 
 to QG. Waves also transfer energy upscale to vertically sheared&nbsp\;hori
 zontal flows that are a key ingredient for internal-wave shear dispersion.
  In the waves-only model\, the&nbsp\;dispersion rate is an order of magnit
 ude smaller and is attributed entirely to internal-wave shear&nbsp\;disper
 sion.
LOCATION:Seminar Room 1\, Newton Institute
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