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SUMMARY:New perspectives on ocean interior turbulent mixing - Ali Mashayek
 \, Department of Earth Sciences\, University of Cambridge
DTSTART:20230428T150000Z
DTEND:20230428T160000Z
UID:TALK200236@talks.cam.ac.uk
CONTACT:Prof. Jerome Neufeld
DESCRIPTION:Recent evidence shows that observational and theoretical consi
 derations support the shear-instability paradigm for ocean interior mixing
 . It also remains the prominent form of parameterisation of mixing in clim
 ate models. On the other hand\, the application of machine learning to glo
 bal observational mixing data sets seems to suggest that the shear-instabi
 lity paradigm is far from dominant in the ocean interior and\, in fact\, m
 ight be a small contributor. While I won't be able to resolve this conundr
 um in this talk\, I will share my thoughts on its potential reasons. The r
 easons fall into three main categories: a) our subjective theoretically-in
 formed view of mixing processes might have restricted how we `look for’ 
 mixing in observations and how we interpret the output of numerical simula
 tions\, b) we have paid less attention to weak background mixing by focusi
 ng on the strongest events which form the basis of our parameterisations\,
  c) the intermittency of turbulence and its statistics are significantly u
 nder-studied. I will argue that a new approach might be required to repres
 ent mixing in climate models\, where larger-scale resolved dynamics constr
 ain statistics and the energetics of small-scale turbulence.
LOCATION:MR2
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