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首页> 外文期刊>Oceanographic Literature Review >Four Types of Baroclinic Instability Waves in the Global Oceans and the Implications for the Vertical Structure of Mesoscale Eddies
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Four Types of Baroclinic Instability Waves in the Global Oceans and the Implications for the Vertical Structure of Mesoscale Eddies

机译：全球海洋中的四种类型的曲金稳定性波以及Mescle Eddies垂直结构的影响

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Linear stability analysis is re-conducted to fully understand the geostrophic distribution of the different types of baroclinic instability (BCI) in the global oceans, their correspondence to the different vertical structures of the observed mesoscale eddies, and the properties and formation mechanisms of the instability waves. Four principal vertical types of BCI are identified, which are found to exhibit large-scale patterns in the global ocean. The surface- and bottom-intensified type (called the Eady type hereafter) is mainly located in the Antarctic Circumpolar Current (ACC) region, locations of the bottom-intensified type (Charne_s.b type) are scattered around the Eady type, the surface-intensified type (Charney_s type) primarily occurs in the subtropics (10°-35°), and the interior-intensified type (Phillips type) occurs primarily between 5° and 20° in both hemispheres. More specifically, both geostrophic locations and the depths of the maximum perturbation velocities of the Phillips type BCIs match those of observed subsurface eddies. Moreover, the BCI waves show regions of uniform propagation properties: eastward in the ACC and the mid-latitudes (25°-45°), and westward in the low latitudes (30°S-30°N) of both hemispheres and in the high latitudes of the Northern Hemisphere (＞50°N). These waves resemble normal mode Rossby waves in structure (i.e., first bar-oclinic, second baroclinic, and topographic Rossby waves), but their propagation speeds are found to be Doppler shifted by the mean flows relevant for the corresponding BCI type. Propagating signals with the same dispersion relationships as the BCI waves are captured with numerical ocean general circulation models.
机译：重新开展线性稳定性分析以充分了解全球海洋中不同类型的氨基氯稳定性（BCI）的热脑分布，它们与观察到的Messcale Eddies的不同垂直结构的对应力，以及不稳定性的性质和形成机制波浪。确定了四种主要垂直类型的BCI，发现在全球海洋中表现出大规模模式。表面和底部强化类型（以下称为详细型）主要位于南极循环电流（ACC）区域中，底部强化型（Charne_s.b型）的位置散布在eady型，表面 - 冷藏类型（Charney_s类型）主要发生在亚波质（10°-35°）中，内部强化型（菲利普斯类型）主要发生在两个半球之间的5°和20°之间。更具体地说，地球节性位置和Phillips型BCIS的最大扰动速度的深度与观察到的地下漩涡的速度相匹配。此外，BCI波显示出均匀的传播特性的区域：在ACC和中外纬度（25°-45°）中，向西，在半球的低纬度（30°S-30°N）中，在北半球的高纬度（> 50°N）。这些波在结构中类似于正常模式rossby波（即，第一条 - 横向，第二曲圈和地形rossby波），但是它们的传播速度被发现是由对应的BCI类型相关的平均流移位的多普勒。用数值海洋一般循环模型捕获具有与BCI波相同的色散关系的传播信号。

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    《Oceanographic Literature Review》 |2021年第5期|973-974|共2页
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