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SUMMARY:Seismic Imaging of Eddy‐Dominated Warm‐Water Transport Across 
 the Bellingshausen Sea - Kathy Gunn\, Department of Earth Sciences\, Unive
 rsity of Cambridge
DTSTART:20181003T100000Z
DTEND:20181003T110000Z
UID:TALK110740@talks.cam.ac.uk
CONTACT:Caroline Holmes
DESCRIPTION:Seismic reflection images of thermohaline circulation from the
  Bellingshausen Sea\, adjacent to the West Antarctica Peninsula\, were acq
 uired during February 2015. This survey shows that bright reflectivity occ
 urs throughout the upper 300 m. By calibrating these seismic images with c
 oeval hydrographic measurements\, intrusion of warm water features onto th
 e continental shelf at Marguerite and Belgica Troughs is identified and ch
 aracterized. These features have distinctive lens‐shaped patterns of ref
 lectivity with lengths of 0.75–11.00 km and thicknesses of 100–150 m\,
  suggesting that they are small mesoscale to submesoscale eddies. Abundant
  eddies are observed along a transect that crosses Belgica Trough. Near Al
 exander Island Drift\, a large\, of order 100 km3\, bowl‐like feature\, 
 that may represent an anticyclonic Taylor column\, is imaged on a pair of 
 orthogonal images. A modified iterative procedure is used to convert seism
 ic imagery into maps of temperature that enable the number and size of edd
 ies being transported onto the shelf to be quantified. Finally\, analysis 
 of prestack shot records suggests that these eddies are advecting southwar
 d at speeds of order 0.1 m s−1\, consistent with limited legacy hydrogra
 phic measurements. \n\nConcentration of observed eddies south of the South
 ern Antarctic Circumpolar Current Front implies they represent both a domi
 nant\, and a long‐lived\, mechanism of warm‐water transport\, especial
 ly across Belgica Trough. Our observations suggest that previous estimates
  of eddy frequency may have been underestimated by up to 1 order of magnit
 ude\, which has significant implications for calculations of ice mass loss
  on the shelf of the West Antarctic Peninsula.\n
LOCATION:British Antarctic Survey\, Innovation Centre\, Seminar Room 1
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