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SUMMARY:Rates and Mechanisms of turbulent mixing in the west Antarctic. - 
 Ryan Scott\, British Antarctic Survey
DTSTART:20180928T100000Z
DTEND:20180928T110000Z
UID:TALK110743@talks.cam.ac.uk
CONTACT:Caroline Holmes
DESCRIPTION:Quantifying and understanding the processes driving ocean mixi
 ng is fundamental to improving heat transport estimations and climate proj
 ections. Underwater autonomous gliders are a new platform that\, compared 
 to more conventional methods such as free-failing profilers\, increase the
  number of available measurements by an order of magnitude. In 2016\, a gl
 ider deployment in Ryder Bay\, a 520 m deep bay adjacent to the British An
 tarctic Survey station at Rothera\, collected both hydrographic and micros
 tructure data\, obtaining the first direct (not-inferred) measurements of 
 dissipation of turbulent kinetic energy and dissipation of temperature var
 iance in the west Antarctic. Elevated dissipation estimates of O(1 x 10^-8
 ^ W kg^-1^) and heat fluxes up to approximately 12.6 W m^-2^ are found abo
 ve a topographic sill. Contrasting values of O(1 x 10^-10^ W kg^-1^) and a
 pproximately 0.2 W m^-2^ are observed in the deep basin\, this suggests th
 at the topography of the bay significantly modulates both the vertical mix
 ing and upward heat flux. These results are currently being analysed in co
 njunction with mooring-based velocity data and the 20-year Rothera Time Se
 ries to identify the dominant controls on summertime mixing. 
LOCATION:British Antarctic Survey\, Seminar Room 330b
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