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首页> 外文期刊>Journal of Physical Oceanography >Oceanic Restratification Forced by Surface Frontogenesis
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Oceanic Restratification Forced by Surface Frontogenesis

机译：地表前生强迫海洋再定殖

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Potential vorticity (PV) conservation implies a strong constraint on the time evolution of the mean density at a given depth. The authors show that, on an f plane and in the absence of sources and sinks of PV, it only depends on two terms, namely, the time evolution of the product between density anomaly and relative vorticity and the vertical PV flux. This primitive equation result, which applies at any depth, suggests that the ageostrophic dynamics induced by baroclinic eddies strongly affect the mean oceanic stratification profile. This result is illustrated for two simple initial-value simulations of a baroclinic, balanced jet. For initial situations propitious to surface frontogenesis, the simulations show a restratification over the whole water column characterized by the amplification in time of the Brunt-Vaeisaelae frequency in the upper oceanic layers. In the absence of surface frontogenesis, such as when the jet is initialized at the middepth of the water column, the restratification is much weaker and slower. Because both simulations have similar kinetic energy and growth rate of baroclinic instability, the results clearly reveal that the restratification is driven by surface frontogenesis in the first case and by vertical PV flux in the interior in the second case. The authors also point out that the dynamics of the interior PV is tightly related to the surface dynamics because of total mass conservation.
机译：潜在涡度（PV）守恒意味着在给定深度上平均密度随时间变化的强烈限制。作者表明，在f平面上并且在没有PV的源和汇的情况下，它仅取决于两个术语，即密度异常和相对涡度之间的乘积随时间的变化以及垂直PV通量。这一原始方程式结果适用于任何深度，表明斜压涡旋诱发的年龄变迁动力学强烈影响平均海洋分层剖面。斜压平衡射流的两个简单初始值模拟说明了该结果。对于有利于地表前缘形成的初始情况，模拟表明整个水柱都发生了重新定殖，其特征是海洋上层的Brunt-Vaeisaelae频率随时间增加。在没有表面锋面发生的情况下，例如当在水柱的中深度初始化射流时，重新定标作用将变得更加弱和慢。因为两个模拟都具有相似的动能和斜压不稳定的增长率，所以结果清楚地表明，在第一种情况下，重新定律是由表面前缘驱动的，而在第二种情况下，则由内部的垂直PV通量驱动。作者还指出，由于总质量守恒，内部光伏的动力学与表面动力学紧密相关。

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