Regulating the Weddell Sea polynya in a coupled model through ocean model parameter tuning - Tarkan Bilge

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• Tarkan Bilge - British Antarctic Survey
• Wednesday 22 October 2025, 15:30-16:30
• BAS Seminar Room 12.

If you have a question about this talk, please contact Katherine Turner.

Exaggerated open-ocean deep convection in the Weddell Sea has been a prevailing issue in coupled climate models, having featured in both CMIP5 and CMIP6 simulations. These convection events vent subsurface heat and sustain a large hole in the sea-ice, known as the Weddell Sea polynya 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 reference ensemble to explore the mechanisms for preconditioning and convection in HadGEM3-GC5, a state-of-the-art coupled climate model developed by the UK Met Office. We then present a suite of parameter perturbation experiments in which we describe the influence of ocean model parameters on deep convection. By tuning parameters in the vertical mixing scheme we present simulations in which convection is reduced to more closely reflect observations. 

This talk is part of the British Antarctic Survey - Polar Oceans seminar series series.

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