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SUMMARY:Regulating the Weddell Sea polynya in a coupled model through ocea
 n model parameter tuning - Tarkan Bilge - Tarkan Bilge - British Antarctic
  Survey
DTSTART:20251022T143000Z
DTEND:20251022T153000Z
UID:TALK236722@talks.cam.ac.uk
CONTACT:Katherine Turner
DESCRIPTION:Exaggerated open-ocean deep convection in the Weddell Sea has 
 been a prevailing issue in coupled climate models\, having featured in bot
 h CMIP5 and CMIP6 simulations. These convection events vent subsurface hea
 t and sustain a large hole in the sea-ice\, known as the Weddell Sea polyn
 ya which can create large Southern Ocean biases in sea-ice\, salinity and 
 ocean heat content. In order to tackle this issue\, we have run a referenc
 e ensemble to explore the mechanisms for preconditioning and convection in
  HadGEM3-GC5\, a state-of-the-art coupled climate model developed by the U
 K Met Office. We then present a suite of parameter perturbation experiment
 s in which we describe the influence of ocean model parameters on deep con
 vection. By tuning parameters in the vertical mixing scheme we present sim
 ulations in which convection is reduced to more closely reflect observatio
 ns. 
LOCATION:BAS Seminar Room 12
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