Recent Wind-Driven Variability in Atlantic Water Mass Distribution and Meridional Overturning Circulation
Recent Wind-Driven Variability in Atlantic Water Mass Distribution and Meridional Overturning Circulation
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DOI：
10.1175/jpo-d-16-0089.1
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发表时间：
2017-03-01
影响因子：
3.5
通讯作者：
Yu, Lisan
中科院分区：
文献类型：
--
作者：
Evans, Dafydd Gwyn;Toole, John;Yu, Lisan
北大西洋副热带环流内的体积水质量分布的年际变化描述在大西洋纬向翻转环流的变化。非绝热和绝热过程中的副热带环流的体积和热量收支的相对作用进行了研究，通过投影数据到温度坐标作为体积的水使用基于阿尔戈的气候和海洋状态估计（ECCO版本4）。这突出表明，在副热带环流体积预算的变化主要是由在环流的运输分歧。由于运输发散和温跃层深度和埃克曼泵在环流的变化量异常之间的强相关性表明，风驱动的升沉驱动器在环流边界的运输异常。这种由风驱动的起伏对环流热含量的变化有很大的贡献，海气通量的异常也是如此。分析表明，风强迫在驱动大西洋纬向翻转环流的年际变化中起着重要的作用，这种变化可以解开空间分布的水文观测使用这里提出的框架。
Interannual variability in the volumetric water mass distribution within the North Atlantic Subtropical Gyre is described in relation to variability in the Atlantic meridional overturning circulation. The relative roles of diabatic and adiabatic processes in the volume and heat budgets of the subtropical gyre are investigated by projecting data into temperature coordinates as volumes of water using an Argo-based climatology and an ocean state estimate (ECCO version 4). This highlights that variations in the subtropical gyre volume budget are predominantly set by transport divergence in the gyre. A strong correlation between the volume anomaly due to transport divergence and the variability of both thermocline depth and Ekman pumping over the gyre suggests that wind-driven heave drives transport anomalies at the gyre boundaries. This wind-driven heaving contributes significantly to variations in the heat content of the gyre, as do anomalies in the air-sea fluxes. The analysis presented suggests that wind forcing plays an important role in driving interannual variability in the Atlantic meridional overturning circulation and that this variability can be unraveled from spatially distributed hydrographic observations using the framework presented here.