Southern Ocean bottom water characteristics in CMIP5 models
Southern Ocean bottom water characteristics in CMIP5 models
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DOI：
10.1002/grl.50287
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发表时间：
2013-04-16
影响因子：
5.2
通讯作者：
Ridley, Jeff K.
中科院分区：
文献类型：
--
作者：
Heuze, Celine;Heywood, Karen J.;Ridley, Jeff K.
气候模型中的南大洋深水特性和形成过程表明，它们有能力模拟未来的气候、热量和碳吸收以及海平面上升。1986-2005年期间，15个CMIP 5（耦合模式相互比较项目第5阶段）气候模式的南大洋温度和密度平均值与观测到的气候学进行了比较，重点是底层水。底部属性对于一半的模型来说是相当准确的。十个模型在南极大陆架上创造了稠密的水，但它与较轻的水混合，并没有像现实中那样作为底层水输出。相反，大多数模型通过开放的海洋深层对流产生深水，这一过程在现实中很少发生。具有广泛深对流的模式是那些在海冰中具有强季节性的模式。最佳的底部属性发生在威德尔和罗斯环流的深对流模式。底层水形成过程在海洋模型中表现不佳，是改善气候预测的一个关键挑战。
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 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. Bottom properties are reasonably accurate for half the models. 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. Instead, most models create deep water by open ocean deep convection, a process occurring rarely in reality. Models with extensive deep convection are those with strong seasonality in sea ice. Optimum bottom properties occur in models with deep convection in the Weddell and Ross Gyres. Bottom Water formation processes are poorly represented in ocean models and are a key challenge for improving climate predictions.