Interannual Variations of Submesoscale Circulations in the Subtropical Northeastern Pacific
Interannual Variations of Submesoscale Circulations in the Subtropical Northeastern Pacific
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DOI：
10.1029/2021gl097664
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发表时间：
2022-03
影响因子：
5.2
通讯作者：
H. Sasaki;B. Qiu;P. Klein;M. Nonaka;Y. Sasai
中科院分区：
文献类型：
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作者：
H. Sasaki;B. Qiu;P. Klein;M. Nonaka;Y. Sasai
最近的研究报告了海洋次尺度环流对海洋环流以及海洋生态系统和海气热通量的影响。因此，它们的区域性和不同时间尺度的变化对于理解它们的影响非常重要。冬季亚中尺度环流活跃，主要是由混合层不稳定性（MLI）增强的。然而，它们在比年际更长的时间尺度上的变化尚不清楚。本研究利用亚中尺度允许模拟的输出，展示了东北太平洋副热带地区冬季活跃的中尺度环流的年际变化及其机制。亚介尺度动能与 MLI 过程中可用势能释放同步变化。厄尔尼诺事件似乎调节了年际变化。此外，还突出了东西亚热带变化的异同。
Impacts of oceanic submesoscale circulations on oceanic circulation as well as marine ecosystem and air‐sea heat flux have been reported by recent studies. Therefore, their regionality and variations on various timescales are important to understand their impacts. The submesoscale circulations are active in winter, which is mostly enhanced by mixed layer instability (MLI). However, their variations on timescales longer than interannual are not well understood. This study shows the interannual variations of active submesoscale circulations in winter and their mechanism in the subtropical northeastern Pacific using the output of a submesoscale permitting simulation. The submesoscale kinetic energy varies synchronously with the available potential energy release in a process of MLI. El Niño events appear to modulate the interannual variations. In addition, the similarities and differences between the variations in the eastern and western subtropics are highlighted.