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SUMMARY:Observed delayed onset of turbulence due to shear instability in t
 he ocean - Professor Matthew Alford\, University of California San Diego
DTSTART:20241025T150000Z
DTEND:20241025T160000Z
UID:TALK221095@talks.cam.ac.uk
CONTACT:Professor Grae Worster
DESCRIPTION:Much work has been done on ocean mixing driven by shear instab
 ility\, which predicts a correspondence between turbulence and low Richard
 son number.  However\, this correspondence is not often seen.  I’ll firs
 t review theory and observational evidence for breaking internal gravity w
 aves due to shear instability and convective instability.  Then I will pre
 sent recent observations in a submarine canyon demonstrating onset of turb
 ulence many buoyancy periods (hours) after unstable Richardson number\, wh
 ich turns out to be consistent with numerical simulations of parallel shea
 r flows.  The implication is that there is yet much to learn about the tim
 e history of turbulence under time-dependent forcing conditions.
LOCATION:MR2
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