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SUMMARY:Intense nutrient upwelling and PV mixing in oceanic anti-cyclones 
 caused by submesoscale instabilities - Liam Brannigan\, University of Oxfo
 rd
DTSTART:20150610T130000Z
DTEND:20150610T140000Z
UID:TALK59471@talks.cam.ac.uk
CONTACT:Dr Dave Munday
DESCRIPTION:Numerous observations from the Norwegian Seas to the Southern 
 Ocean show the presence of anomalously high biological activity in anti-cy
 clonic eddies.  This high productivity suggests that upwelling of nutrient
 -rich water from the thermocline occurs inside anti-cyclonic eddies.   How
 ever\, this upwelling is not captured by existing climate models and so hi
 nders efforts to close the carbon budget.  The upwelling process is consid
 ered here from a potential vorticity viewpoint.  High resolution numerical
  simulations show intense upwelling of high PV filaments from the thermocl
 ine in anti-cyclonic eddies and that the most likely cause of this upwelli
 ng is symmetric instability. It is shown that anti-cyclonic eddies are hig
 hly unstable to symmetric instability and that this induces mixing of pote
 ntial vorticity along stratification surfaces with cyclogenesis effects an
 alogous to those in the troposphere.\n
LOCATION:British Antarctic Survey\, Room 330B
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