A Decomposition of the Atlantic Meridional Overturning Circulation into Physical Components Using Its Sensitivity to Vertical Diffusivity
A Decomposition of the Atlantic Meridional Overturning Circulation into Physical Components Using Its Sensitivity to Vertical Diffusivity
复制标题
利用其对垂直扩散率的敏感性将大西洋经向翻转环流分解为物理成分
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Griesel
中科院分区：
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作者：
J. Mignot;A. Levermann;A. Griesel
摘要研究了全球海气海冰耦合模式CLIMBER-3α中大西洋纬向翻转环流对垂直扩散系数κ的敏感性。三维海洋模式的一个重要特点是它的低扩散示踪平流方案。大西洋翻转的强度Mmax被分解为3个分量：1）在30°S处向南输出的气流MS; 2）平衡大西洋垂直扩散的大尺度上升流; 3）沿沿着大西洋边界的非垂直扩散的依赖于风的上升流通量W。30°S处的水输出量随κ的变化很小，但与格陵兰-苏格兰海脊上的溢流强度密切相关。深对流的位置被发现是混合依赖，从北欧海的转移到Irminger海检测高值的κ。比值R = MS/Mmax给出了半球间翻转效率的度量。
Abstract The sensitivity of the Atlantic Ocean meridional overturning circulation to the vertical diffusion coefficient κ in the global coupled atmosphere–ocean–sea ice model CLIMBER-3α is investigated. An important feature of the three-dimensional ocean model is its low-diffusive tracer advection scheme. The strength Mmax of the Atlantic overturning is decomposed into three components: 1) the flow MS exported southward at 30°S, 2) the large-scale upward flow that balances vertical diffusion in the Atlantic, and 3) a wind-dependent upwelling flux Wbound along the Atlantic boundaries that is not due to vertical diffusion. The export of water at 30°S varies only weakly with κ, but is strongly correlated with the strength of the overflow over the Greenland–Scotland ridge. The location of deep convection is found to be mixing dependent such that a shift from the Nordic seas to the Irminger Sea is detected for high values of κ. The ratio R = MS/Mmax gives a measure of the interhemispheric overturning efficienc...