The mean bottom properties are reasonably accurate for half of the models, but the other half may not yet have approached an equilibrium state. Southern Ocean potential temperature and density averaged over 1986-2005 from fifteen CMIP5 climate models are compared with an observed climatology, focusing on bottom water properties. The depiction of Southern Ocean deep water properties and formation processes in climate models is an indicator of their capability to simulate future climate, heat and carbon uptake, and sea level rise. Heuzé, Céline Heywood, Karen Stevens, David Ridley, Jeff Southern Ocean Bottom Water Characteristics in CMIP5 Models Bottom Water formation processes are poorly represented in ocean models and are a key challenge for improving climate predictions. Optimum bottom properties occur in models with deep convection in the Weddell and Ross Gyres. Models with extensive deep convection are those with strong seasonality in sea ice. Instead, most models create deep water by open ocean deep convection, a process occurring rarely in reality. Ten models create dense water on the Antarctic shelf, but it mixes with lighter water and is not exported as bottom water as in reality. Bottom properties are reasonably accurate for half the models. Southern Ocean temperature and density averaged over 1986-2005 from 15 CMIP5 (Coupled Model Intercomparison Project Phase 5) climate models are compared with an observed climatology, focusing on bottom water. Southern Ocean deep water properties and formation processes in climate models are indicative of their capability to simulate future climate, heat and carbon uptake, and sea level rise. Southern Ocean bottom water characteristics in CMIP5 models
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