The Atlantic Meridional Mode and Its Coupled Variability with the Guinea Dome
The Atlantic Meridional Mode and Its Coupled Variability with the Guinea Dome
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DOI：
10.1175/2009jcli3198.1
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发表时间：
2010-01
影响因子：
4.9
通讯作者：
T. Doi;T. Tozuka;T. Yamagata
中科院分区：
文献类型：
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作者：
T. Doi;T. Tozuka;T. Yamagata
摘要：利用海洋-大气耦合大气环流模型，从大西洋经向模态与北热带大西洋几内亚圆顶的联系的新角度研究了与大西洋经向模态相关的海气相互作用过程。由于风引起的埃克曼上升流，达喀尔附近的地下热海洋穹顶从春末到秋末形成。其季节演变是由于与热带辐合带（ITCZ）向北迁移相关的表面风变化造成的。由于上升流在夏季使几内亚圆顶地区的混合层冷却，因此重现其变化以模拟那里的海面温度（SST）非常重要。在正（负）大西洋经向模态的预处理阶段，晚秋穹顶异常弱（强），混合层异常深（浅）。这种条件降低（增强）了混合层温度对气候大气的敏感性...
Abstract Using an ocean–atmosphere coupled general circulation model, air–sea interaction processes associated with the Atlantic meridional mode are investigated from a new viewpoint of its link with the Guinea Dome in the northern tropical Atlantic. The subsurface thermal oceanic dome develops off Dakar from late spring to late fall owing to wind-induced Ekman upwelling. Its seasonal evolution is due to surface wind variations associated with the northward migration of the intertropical convergence zone (ITCZ). Since the upwelling cools the mixed layer in the Guinea Dome region during summer, it is very important to reproduce its variability in order to simulate the sea surface temperature (SST) there. During the preconditioning phase of the positive (negative) Atlantic meridional mode, the dome is anomalously weak (strong) and the mixed layer is anomalously deep (shallow) there in late fall. This condition reduces (enhances) the sensitivity of the mixed layer temperature to the climatological atmospheri...