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SUMMARY:Spatio-temporal characteristics of mixed-layer turbulence in an en
 ergetic oceanic zone - Pauline Tedesco\, Imperial College
DTSTART:20221010T120000Z
DTEND:20221010T130000Z
UID:TALK183686@talks.cam.ac.uk
CONTACT:9780
DESCRIPTION: The mixed layer (ML) is the ocean surface buffer layer\, thro
 ugh which all buoyancy\, momentum and gas exchanges with the atmosphere pa
 ss. One of the key aspects of the ML for the global ocean circulation is t
 hat it hosts a turbulence redistributing energy across-scales\, either up-
  or down-scales\, and significantly contributing to the global ocean energ
 y balance. Representation of ML turbulence\, in numerical models and from 
 observations\, is therefore critical for investigating global ocean circul
 ation and climate variability. We assess the characteristics of ML turbule
 nce and its sensitivity to spatio-temporal resolution using a numerical si
 mulation of the Drake Passage in winter — a region and period of intense
  meso and submesoscale turbulence. Here we show that the modeled winter ML
  turbulence is accurately inferred from hourly average numerical outputs. 
 The ML is populated by geostrophic and ageostrophic submesoscale currents 
 having a significant KE fraction in temporal scales of 1 day-6 hours up to
  3 hours. The cross-scale KE fluxes shift from intensively upscale to more
  weakly downscale\, where the KE becomes increasingly ageostrophic (KE_age
 ostrophic about 0.1-0.4 of KE_geostrophic\, for spatial-scales O(>6) km)).
  This scale correspondance highlights the contribution to upscale (geostro
 phic currents) and downscale (coupled geostrophic-ageostrophic currents) K
 E fluxes. The characteristics of the ML turbulence are highly sensitive to
  temporal-scales. Daily-averaged outputs fail to represent the ML turbulen
 ce and 6 hourly-averaged outputs represent an intermediate turbulent regim
 e\, between interior quasi-geostrophy theory and ML turbulence. Our result
 s show the need for high spatio-temporal resolution (O(1) km and O(1) h) t
 o accurately infer the ML turbulence. Our results also call for further an
 alysis on the role of ML turbulence on the larger-scale regional dynamics 
 of the Drake Passage.\n
LOCATION:MR5\, CMS
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