Wind-Driven Seasonal Cycle of the Atlantic Meridional Overturning Circulation
Wind-Driven Seasonal Cycle of the Atlantic Meridional Overturning Circulation
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DOI：
10.1175/jpo-d-13-0144.1
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发表时间：
2014-05
影响因子：
3.5
通讯作者：
Jian Zhao;W. Johns
中科院分区：
文献类型：
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作者：
Jian Zhao;W. Johns
摘要采用简单强迫罗斯比波模式和涡旋解析海洋环流模式，研究了大西洋经向翻转环流季节周期的动力学过程。将AMOC的变率分解为Ekman分量和地转输送分量，表明AMOC的季节性是由温带分量和地转输送分量决定的，而以热带的Ekman输送分量为主。在三个纬度（北纬26.5°、北纬6°和南纬34.5°）上详细探讨了控制AMOC季节波动的物理特性。虽然Ekman输运与纬向风应力季节性直接相关，但不同数值模式的比较表明，地转输运涉及一个复杂的海洋对风强迫的调整。通过将纬向一体化地转输送分为东西边界流和内部流，进一步评价了海洋平差。…
AbstractThe dynamical processes governing the seasonal cycle of the Atlantic meridional overturning circulation (AMOC) are studied using a variety of models, ranging from a simple forced Rossby wave model to an eddy-resolving ocean general circulation model. The AMOC variability is decomposed into Ekman and geostrophic transport components, which reveal that the seasonality of the AMOC is determined by both components in the extratropics and dominated by the Ekman transport in the tropics. The physics governing the seasonal fluctuations of the AMOC are explored in detail at three latitudes (26.5°N, 6°N, and 34.5°S). While the Ekman transport is directly related to zonal wind stress seasonality, the comparison between different numerical models shows that the geostrophic transport involves a complex oceanic adjustment to the wind forcing. The oceanic adjustment is further evaluated by separating the zonally integrated geostrophic transport into eastern and western boundary currents and interior flows. The ...