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X-WR-CALNAME:Oceans at MIT
X-WR-CALDESC:Striving to understand\, harness and sustain Earth&#039\;s def
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UID:gva7pvgq40gn82og8h8hrmoqug@google.com
DTSTAMP:20180503T073042Z
CATEGORIES;LANGUAGE=en-US:MIT Seminar | PAOC Oceanography and Climate Sack 
 Lunch
CONTACT:
DESCRIPTION:High-resolution observations of internal wave induced turbulenc
 e in the deep ocean \n\nAn overview is presented of high-resolution temper
 ature observations above underwater topography in the deep\, generally sta
 bly stratified ocean. The Eulerian mooring technique is used to monitor te
 mperature variations by typically 100 sensors distributed over lines betwe
 en 40 and 400 m long. The independent sensors sample at a rate of 1 Hz for
  up to one year with a precision better than 0.1 mK. This precision and sa
 mpling rate are sufficient to resolve the large\, energy containing turbul
 ent eddies and all of the internal waves and their breaking above underwat
 er topography. Such underwater wave breaking is the key mechanism for the 
 redistribution of nutrients and heat (to maintain the ocean stably stratif
 ied)\, and the resuspension of sediment.\n\nUnder conditions of tight temp
 erature-density relationship\, the temperature data are used to quantify t
 urbulent overturns. These observations show two distinctive turbulence pro
 cesses that are associated with different phases of a large-scale\, mainly
  tidal\, internal gravity wave: i) highly nonlinear turbulent bores during
  the upslope propagating phase\, and ii) Kelvin-Helmholtz billows\, at som
 e distance above the slope\, during the downslope phase. While the former 
 may be associated in part with convective turbulent overturning following 
 Rayleigh-Taylor instabilities\, the latter are mainly related to shear-ind
 uced instabilities. Under weaker stratified conditions\, away from boundar
 ies\, free convective mixing appears more often\, but a clear inertial sub
 range in temperature spectra is indicative of dominant shear-induced turbu
 lence. With stratification\, turbulence is seen to increase in dissipation
  rate and diffusivity all the way to the bottom\, which challenges the ide
 a of a homogeneous bottom boundary layer. With a newly developed five-line
 s mooring\, the transition from isotropy (full turbulence) to anisotropy (
 stratified turbulence/internal waves) is revealed.
DTSTART;TZID=America/New_York:20170405T120000
DTEND;TZID=America/New_York:20170405T130000
LOCATION:54-915
SEQUENCE:0
SUMMARY:SLS — Hans van Haren (NIOZ)
URL:http://oceans.mit.edu/event/sls-hans-van-haren
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