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SUMMARY:Linking North and South Atlantic deep water circulation using Nd i
 sotopes - Alex Piotrowski (Earth Sciences\, University of Cambridge)
DTSTART:20091111T163000Z
DTEND:20091111T173000Z
UID:TALK20977@talks.cam.ac.uk
CONTACT:Poul Christoffersen
DESCRIPTION:Understanding changes in ocean circulation during the last deg
 laciation is crucial to unravelling the dynamics of glacial-interglacial a
 nd millennial climate shifts. Neodymium (Nd) isotope records measured on F
 e-Mn oxide leaches from marine sediment cores have been used to reconstruc
 t changes in Atlantic deep water mixing and structure. We present new test
 s of marine Nd extraction\, and new widely distributed records. Taken as a
  whole\, these records provide a coherent reconstruction of glacial Atlant
 ic deep circulation\, which is consistent with benthic d13C reconstruction
 s\, and suggests major changes in water mass strength and structure during
  the last deglaciation. Neodymium isotope measurements from deep western N
 orth Atlantic at the Bermuda Rise allow comparison of our deep water sourc
 e record with overturning strength proxies. This comparison shows that bot
 h deep water mass source and overturning rate shifted rapidly and synchron
 ously during the last deglacial transition. In contrast any freshwater per
 turbation caused by Heinrich event 1\, could have only affected shallow ov
 erturning illustrating the difference between changes in upper-ocean overt
 urning associated with millennial-scale events\, and whole ocean deglacial
  climate events.
LOCATION:Scott Polar Research Institute\, LIBRARY (1ST FLOOR)
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