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首页> 外文期刊>Journal of Physical Oceanography >Sensitivity of the Ventilation Process in the North Pacific to Eddy-Induced Tracer Transport
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Sensitivity of the Ventilation Process in the North Pacific to Eddy-Induced Tracer Transport

机译：北太平洋通风过程对涡流示踪剂传输的敏感性

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摘要

A coarse-resolution isopycnal model coupled with a bulk mixed layer model is used to examine the effect of isopycnal thickness diffusion, which parameterizes the subgrid-scale eddy-induced tracer transport, on ventilation of the North Pacific Ocean. Three numerical experiments with thickness diffusivities of 0 m~2 s~(-1) and around 500 and 2000 m~2 s~(-1) are carried out. The model successfully reproduces a deep winter mixed layer in the subarctic North Pacific, leading to well-formed mode waters and the subtropical countercurrent in the experiment with thickness diffusivity around 500 m~2 s~(-1). The annual-mean subduction rate has peaks at densities of 25.0-25.4 and 26.4 σ_θ. The former peak spans the densities of North Pacific Subtropical Mode Water and North Pacific Eastern Subtropical Mode Water, whereas the latter peak is centered near the density of North Pacific Central Mode Water. The annual mean obduction rate also has the former peak and a slight enhancement corresponding to the latter peak. The Kuroshio plays a crucial role in obduction of North Pacific Subtropical Mode Water by transferring it northward from the permanent pycnocline to the seasonal pycnocline around the Kuroshio Extension, the importance of which has been overlooked in previous studies. In contrast to the simple expectation that the eddy-induced tracer transport enhances the ventilation process, stronger circulation with lower thickness diffusion increases the annual-mean subduction rate by carrying the subducted water quickly away from the seasonal pycnocline into the permanent pycnocline, as well as the annual-mean obduction rate by transferring much water from the permanent pycnocline to the seasonal pycnocline. As thickness diffusivity increases, the former peaks in the subduction and obduction rates occur at lighter densities, whereas the latter peak in the subduction rate is shifted toward higher densities.
机译：粗分辨率等渗模型与整体混合层模型相结合，用于检验等密度厚度扩散对北太平洋大尺度通气的影响，该扩散参数化了亚网格规模涡流引起的示踪物运移。进行了三个数值实验，厚度扩散率为0 m〜2 s〜（-1），分别为500和2000 m〜2 s〜（-1）。该模型成功地复制了北北极亚太平洋深部冬季混合层，形成了模态水和亚热带逆流，厚度扩散率约为500 m〜2 s〜（-1）。年均俯冲率在25.0-25.4和26.4σ_θ处具有峰值。前一个峰横跨北太平洋亚热带模式水和北太平洋东亚热带模式水的密度，而后一个峰集中在北太平洋中模式水的密度附近。年平均发生率也有前一个峰值，并有一个稍高的值对应于后一个峰值。黑潮在将北太平洋亚热带模式水从永久比浓线向北转移到黑潮延伸带周围的季节性比浓线中起着至关重要的作用，其重要性在先前的研究中被忽略了。与简单地期望涡流引起的示踪剂传输增强了通风过程相反，更强的环流和较低的厚度扩散通过将俯冲的水迅速从季节性比多克林带入永久比多克林以及永久性比多克林来提高年均俯冲率。通过将大量的水从永久比浓菌素转移到季节性比浓菌素来实现年均观测率。随着厚度扩散率的增加，俯冲率和俯冲率的前一个峰值出现在较轻的密度处，而俯冲率的后一个峰值向较高密度移动。

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