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首页> 外文期刊>Journal of Physical Oceanography >Multiple Equilibria and Hysteresis of Two Unequal-Transport Western Boundary Currents Colliding at a Gap
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Multiple Equilibria and Hysteresis of Two Unequal-Transport Western Boundary Currents Colliding at a Gap

机译：两个不等距传输的西方边界流在间隙处的多重平衡和磁滞

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摘要

The nonlinear collision of two western boundary currents (WBCs) of Munk thickness L_m colliding near a gap of width 2a is studied using a 1.5-layer, reduced-gravity, quasigeostrophic ocean model. The work is a continuation of our recent study on nonlinear collision of two equal-strength WBCs at a wide gap. It is found that, for narrow gaps, a ＜ 57L_M, and both of the WBCs fail to penetrate into the western basin due to the restriction of friction; for intermediate size gaps, 5.7 L_m≤a ＜ 9.6L_M, and multiple equilibrium states exist for the colliding WBCs: the penetrating state, the choking state, and the eddy-shedding state. The current system transits between them through a hysteresis procedure, with transitions at different Reynolds numbers from those in the equal-transport case. The stronger WBC tends to intrude more deeply into the western basin than the weaker WBC; for wide gaps, a ＞ 9.6L_m, and only penetrating and eddy-shedding states exist. No choking state is identified for either WBC. It is found that the critical gap width for the disappearance of the choking state decreases with the asymmetry of the WBC system. The theory is used to explain some of the circulation features at the entrance of the Indonesian Throughflow in the western Pacific Ocean recently observed with satellite-tracked surface drifters.
机译：使用1.5层低重力准地转海洋模型研究了两个Munk厚度L_m的西方边界流（WBC）在宽度2a的间隙附近碰撞时的非线性碰撞。这项工作是我们最近对两个等强度的WBC在较大间隙处进行非线性碰撞研究的延续。结果发现，对于狭窄的缝隙，a ＜57L_M，并且由于摩擦的限制，两个白细胞都不能渗入西部盆地。对于中等大小的间隙，5.7L_m≤a＜9.6L_M，并且碰撞的WBC存在多个平衡状态：穿透状态，窒息状态和涡流脱落状态。当前系统通过磁滞过程在它们之间转换，与等传输情况下的转换雷诺数不同。与较弱的WBC相比，较强的WBC倾向于更深入地侵入西部盆地。对于较大的间隙，a＞ 9.6L_m，并且仅存在穿透和涡流脱落状态。没有为任何一个WBC识别阻塞状态。已经发现，随着WBC系统的不对称性，窒息状态消失的临界间隙宽度减小。该理论用于解释最近通过卫星跟踪的地面浮标观测到的西太平洋印度尼西亚通流入口处的某些环流特征。

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    《Journal of Physical Oceanography》 |2014年第7期|1873-1885|共13页
  • 作者

    Zheng Wang; Dongliang Yuan;

  • 作者单位

    Key Laboratory of Ocean Circulation and Waves, and Institute of Oceanology, Chinese Academy of Sciences,Qingdao, and State Key Laboratory of Atmosphere Sciences and Geophysical Fluid Dynamics, Institute of Atmosphere Physics, Chinese Academy of Sciences, Beijing, and Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao, China;

    Key Laboratory of Ocean Circulation and Waves, and Institute of Oceanology, Chinese Academy of Sciences, and Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao, China;

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