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CATEGORIES:Quantitative Climate and Environmental Science Sem
 inars
SUMMARY:Spatio-temporal characteristics of mixed-layer tur
 bulence in an energetic oceanic zone - Pauline Ted
 esco\, Imperial College
DTSTART;TZID=Europe/London:20221010T130000
DTEND;TZID=Europe/London:20221010T140000
UID:TALK183686AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/183686
DESCRIPTION: The mixed layer (ML) is the ocean surface buffer 
 layer\, through which all buoyancy\, momentum and 
 gas exchanges with the atmosphere pass. One of the
  key aspects of the ML for the global ocean circul
 ation is that it hosts a turbulence redistributing
  energy across-scales\, either up- or down-scales\
 , and significantly contributing to the global oce
 an energy balance. Representation of ML turbulence
 \, in numerical models and from observations\, is 
 therefore critical for investigating global ocean 
 circulation and climate variability. We assess the
  characteristics of ML turbulence and its sensitiv
 ity to spatio-temporal resolution using a numerica
 l simulation of the Drake Passage in winter — a re
 gion and period of intense meso and submesoscale t
 urbulence. Here we show that the modeled winter ML
  turbulence is accurately inferred from hourly ave
 rage numerical outputs. The ML is populated by geo
 strophic and ageostrophic submesoscale currents ha
 ving 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 wea
 kly downscale\, where the KE becomes increasingly 
 ageostrophic (KE_ageostrophic about 0.1-0.4 of KE_
 geostrophic\, for spatial-scales O(>6) km)). This 
 scale correspondance highlights the contribution t
 o upscale (geostrophic currents) and downscale (co
 upled geostrophic-ageostrophic currents) KE fluxes
 . The characteristics of the ML turbulence are hig
 hly sensitive to temporal-scales. Daily-averaged o
 utputs fail to represent the ML turbulence and 6 h
 ourly-averaged outputs represent an intermediate t
 urbulent regime\, between interior quasi-geostroph
 y theory and ML turbulence. Our results show the n
 eed for high spatio-temporal resolution (O(1) km a
 nd O(1) h) to accurately infer the ML turbulence. 
 Our results also call for further analysis on the 
 role of ML turbulence on the larger-scale regional
  dynamics of the Drake Passage.\n
LOCATION:MR5\, CMS
CONTACT:
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