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首页> 外文期刊>Journal of oceanography >Stability and slow overturning of the water column in the Weddell Sea under a sea ice cover
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Stability and slow overturning of the water column in the Weddell Sea under a sea ice cover

机译：海冰覆盖下威德尔海水柱的稳定性和缓慢倾覆

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摘要

A crucial controlling factor on the stability of the two-layered water column in the Weddell Sea is its sea ice cover, which acts through a negative feedback mechanism (NFM) due to the thermal barrier at the mixed layer base. The present study revisits the problem of how the NFM affects the stability and overturning of the water column using a fine-resolution nonhydrostatic model to run experiments employing various background mixing coefficients (viscosity and diffusivity ) and Earth rotation (Coriolis parameter f) with and without the sea ice cover. In the ice-free case without the NFM, destabilization and overturning of the water column are accelerated by lower () and f=0 , since convection is enhanced in the mixed layer. Vigorous convection increases the upward salt flux from the deep layer and densifies the mixed layer against the concurrent upward heat flux. In the ice-covered case with the NFM, to the contrary, the destabilization and overturning are decelerated by lower () and f=0. The upward heat flux due to mixed layer convection delays destabilization by reducing ice formation through the NFM. On the other hand, lower decelerates the overturning, suppressing cabbeling instability at the mixed layer base. As a result, the entire process of destabilization and overturning needs more than two months at the maximum. Additional experiments, together with observational data, suggest that such a slow process may have occurred in the Weddell Sea.
机译：威德尔海中两层水柱稳定性的关键控制因素是其海冰覆盖层，由于混合层底部的热障，它的作用是通过负反馈机制（NFM）起作用。本研究使用细分辨率的非静水模型，通过使用各种背景混合系数（粘度和扩散率）和地球自转（科里奥利参数f），对NFM如何影响水柱的稳定性和倾覆问题进行了研究。海冰盖。在没有NFM的无冰情况下，由于混合层中的对流增强，水柱的失稳和倾覆会因下（）和f = 0而加速。剧烈对流会增加来自深层的向上盐通量，并使混合层相对于同时出现的向上热通量致密。相反，在具有NFM的冰雪覆盖的情况下，降低稳定性和倾覆会因Lower（）和f = 0而减慢。由于混合层对流而导致的向上热通量通过减少通过NFM的冰形成而延迟了不稳定化。另一方面，Low降低了倾覆，抑制了混合层基层的滑移不稳定性。结果，破坏稳定和倾覆的整个过程最多需要两个月以上的时间。其他实验以及观测数据表明，这种缓慢的过程可能发生在韦德尔海。

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