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SUMMARY:Water pathways in the Southern Ocean from Lagrangian particles - D
 r. Erik van Sebille\, University of New South Wales
DTSTART:20140710T120000Z
DTEND:20140710T130000Z
UID:TALK53276@talks.cam.ac.uk
CONTACT:Dr Alexander Brearley
DESCRIPTION:The ocean is in constant motion\, with water circulating withi
 n and flowing between basins. As the water moves around\, it caries heat a
 nd nutrients\, as well as larger objects like planktonic marine species an
 d litter around the globe. \n\nThe most natural way to study the pathways 
 of water and the connections between ocean basins is in a Lagrangian frame
 work\, where the ocean circulation is traced out using particle trajectori
 es. The trajectories can come from either numerical integration of virtual
  floats in high-resolution ocean models\, or from the paths of free-flowin
 g observational drifters (surface buoys or Argo floats) in the real ocean.
 \n\nIn this presentation\, I will show some examples of Lagrangian-derived
  pathways in the Southern Ocean. I will show preliminary results on drifti
 ng buoy separation in the pacific Sector of the Southern Ocean\, as well a
 s discuss how these drifting buoys can be used to create a statistical mod
 el of the surface circulation that can be used to study the drift of marin
 e litter.\n\nFinally\, I will discuss the pathways of the different variet
 ies of Antarctic Bottom Water (AABW) from their source regions around Anta
 rctica to the abyssal subtropical basins using Lagrangian particles in the
  SOSE model. In particular\, I will show how the mixing ratios of the diff
 erent source types of AABW are similar once it reaches the three subtropic
 al basins. This is suggestive of an amalgamation of the different source w
 aters in the Southern Ocean\, which we show is related to vigorous deep ed
 dy mixing around 50S.
LOCATION:British Antarctic Survey\, Room 187
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