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SUMMARY:Visualization and Numerical Modeling of Localized Mixing by Self-I
 nteracting Internal Wave Beams - Dylan Bruney (University of North Carolin
 a)
DTSTART:20221201T110000Z
DTEND:20221201T120000Z
UID:TALK193363@talks.cam.ac.uk
DESCRIPTION:The meridional overturning circulation is regulated by diapycn
 al mixing in the abyssal ocean. This mixing is produced by the nonlinear i
 nteractions of internal waves (IWs) which are created when the barotropic 
 tide flows over topography. Mathematically\, an oscillating fluid over a s
 tationary ridge is equivalent to a stationary fluid beneath an oscillating
  ridge. Motivated by this concept\, we conducted a series of laboratory ex
 periments to study the evolution of the density field by oscillating an ar
 tificial ridge in a linearly stratified tank. Using a novel Background Ori
 ented Schlieren (BOS) software package\, as well as a unique BOS setup\, w
 e can obtain the evolution of internal wave beams through visualization of
  the density field. This is then further analyzed to produce the resultant
  density and velocity fields. &nbsp\;We performed these experiments at bot
 h a small scale that required a few pounds of stratifying salts to create 
 a linear regime\, and at a larger scale that required over 2000 lbs of sal
 t. The analysis of these experiments is ongoing\, and I will share the bac
 kground and preliminary results on both mixing efficiency measurements and
  the mechanisms behind a localized mixing phenomena we observed called &ld
 quo\;intrusions&rdquo\;.
LOCATION:Seminar Room 2\, Newton Institute
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