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X-WR-CALNAME:Oceans at MIT
X-WR-CALDESC:Striving to understand\, harness and sustain Earth&#039\;s def
 ining frontier.
X-FROM-URL:http://oceans.mit.edu
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DTSTART:20171105T020000
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RDATE:20181104T020000
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UID:7j9i2205fbrlbhkkk9roqg5nd8@google.com
DTSTAMP:20180503T103343Z
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DESCRIPTION:Title: Ocean mixing driven by tides: breaking lee waves\, hydra
 ulic jumps and the influence of subinertial internal tides\n\nAbstract: Th
 e dissipation of tidal energy in the abyssal ocean leads to diapycnal mixi
 ng\, raising the deep cold waters that form at high latitudes\, and provid
 ing an important link in the energetics of the overturning circulation. Ob
 servations of deep ocean mixing show that it is both intermittent and high
 ly inhomogeneous\, with hotspots over regions of rough topography. Determi
 ning when\, where and how much the ocean mixes is of critical importance f
 or understanding the large scale circulation\, with implications for bioge
 ochemistry\, heat transport and ocean modeling in a changing climate.\n\nI
 n this talk\, I will focus on specific processes associated with tidally d
 riven turbulence\, combining field observations and numerical modeling of 
 flows through a small channel that transects the crest of the Mendocino Ri
 dge in the eastern Pacific\, a site of mixed (diurnal and semidiurnal) tid
 es. At this latitude the diurnal tide is subinertial and evanescent away f
 rom the topography\, in contrast to the semidiurnal tide which is superine
 rtial and radiating. We construct two numerical simulations to interpret o
 ur observations. First\, we use a two-dimensional\, nonhydrostatic\, high 
 resolution simulation to examine flow through the channel\, and show that 
 the observed turbulence arises from both hydraulic jumps and breaking inte
 rnal lee waves. To place the processes in a regional context\, we use a se
 cond simulation of tidally driven flow in a three-dimensional domain using
  realistic bathymetry\, demonstrating the presence of diurnal bottom-trapp
 ed waves. These energetic internal waves generate strong currents close to
  the topography\, and their interplay with the superinertial tidal constit
 uent is of leading order importance in determining the timing and magnitud
 e of the observed turbulence at the ridge.\n\nOur observations and models 
 illustrate some of the mechanisms by which energy is transferred from the 
 tides to the large scale circulation\, and highlight the role of subinerti
 al trapped waves at this location. We posit that these waves may be import
 ant contributors to ocean mixing\, especially at climatically sensitive hi
 gh latitudes.\n\nEvent link: https://eapsweb.mit.edu/paoc-colloquium-ruth-
 musgrave-mit
DTSTART;TZID=America/New_York:20160919T120000
DTEND;TZID=America/New_York:20160919T130000
LOCATION:Ida Green Lounge (9th Floor)\, Building 54\, Cambridge\, MA\, Unit
 ed States
SEQUENCE:0
SUMMARY:PAOC Colloquium: Ruth Musgrave (MIT)
URL:http://oceans.mit.edu/event/paoc-colloquium-ruth-musgrave-mit
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