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SUMMARY:Controls on turbulent mixing on the West Antarctic Peninsula shelf
  - Dr Alexander Brearley (British Antarctic Survey)
DTSTART:20160727T120000Z
DTEND:20160727T130000Z
UID:TALK63374@talks.cam.ac.uk
CONTACT:Dr Dave Munday
DESCRIPTION:Turbulent mixing on the west Antarctic Peninsula shelf is a hi
 ghly important process\, being responsible both for delivering ocean heat 
 to the melting glaciers of the region\, and for supplying nutrients to the
  biologically productive surface layers. Despite this\, literature estimat
 es of the turbulent diffusivity and the associated heat fluxes vary by up 
 to an order of magnitude\, and direct estimates of mixing are extremely sp
 arse.\n\nIn this talk\, we document and discuss two separate pieces of fie
 ldwork aimed at understanding both the magnitude of mixing at the Rothera 
 Time Series (RaTS) site\, and its controlling processes. Whilst overall he
 at fluxes through the pycnocline at the site are relatively modest (~1 W m
 -2)\, shear instabilities in the water column arise by different mechanism
 s during periods when fast ice is absent or present. Whilst the diurnal ti
 des are important in generating velocity shear year-round\, a significant 
 input of wind-driven near-inertial energy into the ocean during the fast-i
 ce-free months is responsible for generating turbulent motions. We will al
 so discuss the most recent microstructure estimates of turbulent diffusivi
 ty obtained in February 2016 from Ryder Bay\, and discuss how the results 
 compare to finestructure-based estimates of turbulent dissipation.
LOCATION:British Antarctic Survey\, Room 330B
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