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UID:u24hh7d4d0vvru16l1rum83b1k@google.com
DTSTAMP:20180503T091839Z
CATEGORIES;LANGUAGE=en-US:MIT Seminar | PAOC Oceanography and Climate Sack 
 Lunch
CONTACT:
DESCRIPTION:We describe and interpret in situ observations of tidally drive
 n turbulence that were obtained in the vicinity of a small channel that tr
 ansects the crest of the Mendocino Ridge in the north-eastern Pacific. Flo
 ws are funneled through the channel and have tidal excursion lengths compa
 rable to the width of the ridge crest. Once per day\, energetic turbulence
  is observed in the channel\, with overturns spanning almost half of the f
 ull water depth. A high resolution\, nonhydrostatic\, 2.5-dimensional simu
 lation is used to interpret the observations in terms of the advection of 
 a breaking tidal lee wave past the site location\, and subsequent developm
 ent of a hydraulic jump. During this phase of the tide the strong transpor
 ts were associated with full depth flows\, however\, during the weaker bea
 t of the tide transports were shallow and surface-confined\, generating ne
 gligible turbulence. A regional numerical model of the area finds that the
  subinertial K1 (diurnal) tidal constituent generates topographically trap
 ped waves which propagate anticyclonically around the ridge\, and are asso
 ciated with enhanced near-topographic K1 transports. The interaction of th
 e trapped waves with the M2 (semidiurnal) surface tide produces a baroclin
 ic tidal flow that is alternately surface confined and full depth. Consist
 ent with observations\, full depth flows are associated with the generatio
 n of a large amplitude tidal lee wave on the northward face of the ridge\,
  while surface confined flows are largely nonturbulent. The regional model
  demonstrates that nearfield dissipation over the entire ridge is diurnall
 y modulated\, despite the larger amplitude of the M2 tidal constituent\, i
 ndicating that the trapped wave modulates near-field dissipation and mixin
 g at this location.
DTSTART;TZID=America/New_York:20160309T120000
DTEND;TZID=America/New_York:20160309T130000
LOCATION:54-915
SEQUENCE:0
SUMMARY:SLS- Ruth Musgrave (MIT-MechE) – Tidally driven mixing: breaking le
 e waves\, hydraulic jumps and the influence of subinertial trapped interna
 l tides
URL:http://oceans.mit.edu/event/sls-ruth-musgrave-mit-meche-tidally-driven-
 mixing-breaking-lee-waves-hydraulic-jumps-and-the-influence-of-subinertial
 -trapped-internal-tides
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