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SUMMARY:Bathymetric controls on deep water flow and modification on the we
 stern Antarctic Peninsula shelf\, as measured by ocean gliders - Hugh Vena
 bles (British Antarctic Survey)
DTSTART:20140611T100000Z
DTEND:20140611T110000Z
UID:TALK51761@talks.cam.ac.uk
CONTACT:Dr Dan Jones
DESCRIPTION:Ocean heat flux across the western Antarctic Peninsula (WAP) s
 helf is important in providing the energy required to drive the rapid melt
  rates observed in ice sheets and glaciers. There is however still signifi
 cant uncertainty in the dominant processes controlling this heat flux\, to
 gether with its overall magnitude. Two years’ of hydrographic data from 
 ocean gliders identify a strong link between the bathymetry and the flow a
 nd mixing of deep water on the shelf. These localised mixing events occur 
 at overflow locations where ridges partially block the flow of deep water 
 along narrow glacially carved channels. Relatively shallow and cold water 
 from the thermocline is mixed with warmer water in downward flows beyond t
 he ridges. Understanding this process helps the interpretation of where an
 d when heat is lost from the deep water on the shelf and highlights specif
 ic areas for further investigation of mixing and heat flux towards the coa
 st. It also suggests a link between shallow waters\, with noted seasonal a
 nd interannual variability linked to changing ice cover\, and deeper water
 s that are otherwise more isolated from surface processes. The high resolu
 tion data shows isolated depressions with bottom temperatures cooler or wa
 rmer than surrounding areas of the same depth\, with potential impacts on 
 benthic diversity.
LOCATION:British Antarctic Survey\, conference room
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