The dominant mechanisms of variability in Atlantic Ocean Heat Transport in a Coupled Ocean‐Atmosphere GCM
The dominant mechanisms of variability in Atlantic Ocean Heat Transport in a Coupled Ocean‐Atmosphere GCM
复制标题
海洋-大气耦合 GCM 中大西洋热传输变化的主要机制
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
R. Sutton
中科院分区：
文献类型：
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作者：
B. Dong;R. Sutton
通过对一个耦合的海气环流模式（GCM）的模拟，对大西洋纬向海洋热输送（OHT）的变化进行了诊断，并阐明了造成这种变化的机制。年际变率主要由风应力驱动的Ekman波动主导，占OHT方差的50.3%。相比之下，在大西洋OHT的年代际和年代际变化主要是由混合温盐/环流模式驱动的浮力通量和风应力旋度的变化。它占低通滤波OHT方差的55.6%。北大西洋涛动（NAO）对年际模态和低频模态都有重要作用，但不是唯一的重要驱动因子。这两种模式的一个显著特征是热带大气和海洋的显著变化。我们强调了一些潜在的机制参与热带-外热带遥相关。
The variability of the Atlantic meridional ocean heat transport (OHT) has been diagnosed from a simulation of a coupled ocean‐atmosphere general circulation model (GCM), and the mechanisms responsible for this variability have been elucidated. Interannual variability is dominated by windstress‐driven Ekman fluctuations, which account for 50.3% of the OHT variance. By contrast, decadal and multidecadal variability in Atlantic OHT is dominated by a mixed thermohaline/gyre mode driven by variations in buoyancy fluxes and windstress curl. It accounts for 55.6% of low pass filtered OHT variance. The North Atlantic Oscillation (NAO) has a significant role in both the interannual mode and the low frequency mode, but it is not the only important driver. A notable feature of both modes is significant changes in the tropical atmosphere and ocean. We highlight a number of potential mechanisms involved in the tropical‐extratropical teleconnections.