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首页> 外文期刊>Journal of Physical Oceanography >A Barotropic Vorticity Budget for the Subtropical North Atlantic Based on Observations
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A Barotropic Vorticity Budget for the Subtropical North Atlantic Based on Observations

机译：基于观测的亚热带北大西洋的正压涡度预算

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摘要

To ground truth the large-scale dynamical balance of the North Atlantic subtropical gyre with observations, a barotropic vorticity budget is constructed in the ECCO state estimate and compared with hydrographic observations and wind stress data products. The hydrographic dataset at the center of this work is the A22 WOCE section, which lies along 66 degrees W and creates a closed volume with the North and South American coasts to its west. The planetary vorticity flux across A22 is quantified, providing a metric for the net meridional flow in the western subtropical gyre. The wind stress forcing over the subtropical gyre to the west and east of the A22 section is calculated from several wind stress data products. These observational budget terms are found to be consistent with an approximate barotropic Sverdrup balance in the eastern subtropical gyre and are on the same order as budget terms in the ECCO state estimate. The ECCO vorticity budget is closed by bottom pressure torques in the western subtropical gyre, which is consistent with previous studies. In sum, the analysis provides observational ground truth for the North Atlantic subtropical vorticity balance and explores the seasonal variability of this balance for the first time using the ECCO state estimate. This balance is found to hold on monthly time scales in ECCO, suggesting that the integrated subtropical gyre responds to forcing through fast barotropic adjustment.
机译：为使真相与观测值相吻合，北大西洋亚热带回旋的大规模动力平衡，在ECCO状态估计中建立了正压涡度预算，并将其与水文观测和风应力数据产品进行了比较。该工作中心的水文数据集是A22 WOCE断面，该断面位于西纬66度，其北美和南美沿其西边形成封闭体积。量化了穿过A22的行星涡流，为西亚热带回旋的净子午流提供了度量。 A22断面以西和以东的亚热带回旋上的风应力是根据几个风应力数据乘积计算得出的。发现这些观测预算术语与东亚热带回旋带中的正压Sverdrup余额大致相符，并且与ECCO国家估算中的预算术语相同。 ECCO涡度预算由西部亚热带回旋中的底部压力扭矩封闭，这与以前的研究一致。总之，该分析为北大西洋亚热带涡度平衡提供了观测基础，并首次使用ECCO状态估计值探索了该平衡的季节性变化。在ECCO中发现这种平衡保持在每月的时间尺度上，这表明整合的亚热带回旋通过快速的正压调整对强迫做出了响应。

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