Sensitivity of a coarse resolution ocean general circulation model under climate change forcing

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Gough, William A. ; Allakhverdova, Tatiana (2011)

Tunable parameters in an ocean general circulation model are assessed as modifiers to themodel response to several climate change scenarios. For the current climate scenario it is foundthat vertical diffusivity plays a dominant rôle as expected. An analysis of the horizontal diffusivityvariation suggests that use of the peak value of the overturning streamfunction is a misleadingindicator of model flow strength. For the warming and cooling scenarios vertical and horizontaldiffusivity variations dominated the equilibria response. However, these tunable parameters areof minor significance in the transient response in the cooling scenarios. The diffusively dominantwarming scenarios, in contrast, very much depend on the magnitude of the vertical diffusivity.This has important implications for the use of coarse resolution models in coupled atmosphereoceanmodel climate change simulations.DOI: 10.1034/j.1600-0870.1998.00009.x
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