Recent trends in the Southern Ocean eddy field
Recent trends in the Southern Ocean eddy field
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DOI：
10.1002/2014jc010470
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发表时间：
2015-01-01
影响因子：
3.6
通讯作者：
Morrison, Adele K.
中科院分区：
文献类型：
--
作者：
Hogg, Andrew McC.;Meredith, Michael P.;Morrison, Adele K.
南大洋的涡旋减缓了南极环极流（ACC）对强迫变化的反应。对南大洋卫星测高记录的最新分析表明，近几十年来涡旋动能（EKE）增加，同时ACC输送可能减少。在南大洋的太平洋板块(14.94.1 cm（2) s(-2) / 10年）和印度板块(18.35.1 cm（2) s(-2) / 10年），EKE趋势最大。我们使用理想的高分辨率海洋模型进行扰动实验，验证了风应力变化可以解释观测到的EKE趋势的假设。EKE的年代际增加很可能是由于南大洋上风应力的持续增加，尽管叠加了相当大的年际变化。在年际时间尺度上，ACC输运与风应力相关性较好，但在较长时间尺度上受风强迫的影响较弱。南大洋涡旋场强度的增加对翻转环流、碳循环和气候都有影响。
Eddies in the Southern Ocean act to moderate the response of the Antarctic Circumpolar Current (ACC) to changes in forcing. An updated analysis of the Southern Ocean satellite altimetry record indicates an increase in eddy kinetic energy (EKE) in recent decades, contemporaneous with a probable decrease in ACC transport. The EKE trend is largest in the Pacific (14.94.1 cm(2) s(-2) per decade) and Indian (18.35.1 cm(2) s(-2) per decade) sectors of the Southern Ocean. We test the hypothesis that variations in wind stress can account for the observed EKE trends using perturbation experiments conducted with idealized high-resolution ocean models. The decadal increase in EKE is most likely due to continuing increases in the wind stress over the Southern Ocean, albeit with considerable interannual variability superposed. ACC transport correlates well with wind stress on these interannual time scales, but is weakly affected by wind forcing at longer periods. The increasing intensity of the Southern Ocean eddy field has implications for overturning circulation, carbon cycling, and climate.