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首页> 外文期刊>Ocean Dynamics >The equatorial undercurrent, meridional overturning circulation, and their roles in mass and heat exchanges during El Nino events in the tropical Pacific ocean
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The equatorial undercurrent, meridional overturning circulation, and their roles in mass and heat exchanges during El Nino events in the tropical Pacific ocean

机译：赤道暗流，子午翻转环流及其在热带太平洋厄尔尼诺事件期间在质量和热交换中的作用

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摘要

The equatorial undercurrent (EUC), the shallow meridional overturning cells feeding it, and their role in El Nino and decadal variability in the equatorial Pacific are studied using both in situ data and an ocean general circulation model. Using temperature and current data from the TAO/TRITON moorings at the equator, their data gaps are filled and it was shown that continuous time series of mass transport, temperature, depth, and kinetic energy of the EUC could be constructed for the period 1980-2002 with an excellent accuracy. This dataset was analysed and used to validate the output from an oceanic general circulation model (OGCM). The OGCM was then used to find that variations in the strength of the EUC, shallow meridional overturning (pycnocline convergence and surface divergence), and equatorial upwelling had the same variations in mass transport on interannual and longer time scales within the period 1951-1999. These variations are all caused by variations of the zonal wind stress zonally integrated, in agreement with simple linear and steady dynamics theories. Impact of these mass transport variations and of temperature variations on heat budgets in the entire equatorial band of the Pacific and in its eastern part are quantified.
机译：利用原位数据和海洋总环流模型研究了赤道​​暗流（EUC），向其馈入的浅子午翻转单元及其在厄尔尼诺现象和赤道太平洋年代际变化中的作用。利用来自赤道TAO / TRITON系泊的温度和电流数据，填补了它们的数据空白，结果表明可以为1980-1980年构建EUC的质量，运动，温度，深度和动能的连续时间序列。 2002年的准确性极高。对该数据集进行了分析，并用于验证海洋总环流模型（OGCM）的输出。然后，利用OGCM来发现1951-1999年期间EUC强度，浅经向翻转（强斜线收敛和表面发散）以及赤道上升流在年际和更长的时间尺度上的质量输运具有相同的变化。这些变化都是由区域风应力的变化引起的，这些变化是与简单的线性和稳态动力学理论一致地进行了区域积分的。量化了这些大规模运输变化和温度变化对整个太平洋赤道带及其东部的热收支的影响。

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