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SUMMARY:Climate effects of ocean overturning on heat content anomalies and
  atmospheric CO2 - Ric Williams\; Liverpool University
DTSTART:20130613T130000Z
DTEND:20130613T140000Z
UID:TALK45720@talks.cam.ac.uk
CONTACT:Dr Andrew Meijers
DESCRIPTION:The climate effect of the meridional overturning circulation (
 MOC) is discussed in terms of two separate examples\, the connection with 
 decadal heat anomalies in the North Atlantic and the longer-term connectio
 n with atmospheric CO2.  Firstly\, historical temperate date over the last
  60 years suggest that there are thermal anomalies extending to depths of 
 1 to 2 kilometres over the subtropical and subpolar gyres\, which often ha
 ve the opposing sign in each gyre.  A dynamical assimilation of the histor
 ical data suggests that these decadal thermal anomalies are primarily form
 ed by the convergence in ocean heat transport: the subtropical thermal ano
 malies are mainly controlled by the wind-induced Ekman convergence in the 
 heat transport\, while the subpolar thermal anomalies are instead controll
 ed by the convergence in the MOC-Ekman heat transport.   Secondly\, couple
 d carbon and general circulation model experiments suggest that there is a
  long-term effect on atmospheric CO2 whenever overturning anomalies connec
 t to changes in the Southern Ocean: increasing residual circulation leads 
 to increasing long-term atmospheric CO2. This relationship is a consequenc
 e of partly compensating processes\, increased overturning enhances the su
 bduction of carbon\, but at the same time enhancing the upwelling of regen
 erated carbon.
LOCATION:British Antarctic Survey\, Room 307
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