The Dispersal of Dense Water Formed in an Idealized Coastal Polynya on a Shallow Sloping Shelf
The Dispersal of Dense Water Formed in an Idealized Coastal Polynya on a Shallow Sloping Shelf
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浅倾斜陆架上理想化的沿海冰间湖中形成的浓水的扩散
DOI：
10.1175/jpo-d-13-0188.1
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发表时间：
2014
影响因子：
3.5
通讯作者：
C. Cenedese
中科院分区：
文献类型：
--
作者：
W. Zhang;C. Cenedese
摘要本研究研究了在没有环境环流和分层的情况下，在倾斜陆架上理想化的沿海冰间湖中形成的浓水的扩散。数值和实验室实验都揭示了稠密水的两个独立的底部路径：离岸羽流下坡进入更深的周围水域，以及沿开尔文波传播方向流动的沿海流。尺度分析表明，近海羽流的速度不仅与减重、底坡、科里奥利参数的倒数成正比，而且与浓水深度与总水深的比值成正比。浓水沿岸流是由沿陆架斜压梯度产生的。它的动力学可以分为两个阶段：（i）在源区域附近，粘性项可以忽略不计，其速度与减小的重力波速度成正比；（ii）在远场中，底部阻力变得重要并平衡压力梯度，速度...
AbstractThis study examines the dispersal of dense water formed in an idealized coastal polynya on a sloping shelf in the absence of ambient circulation and stratification. Both numerical and laboratory experiments reveal two separate bottom pathways for the dense water: an offshore plume moving downslope into deeper ambient water and a coastal current flowing in the direction of Kelvin wave propagation. Scaling analysis shows that the velocity of the offshore plume is proportional not only to the reduced gravity, bottom slope, and inverse of the Coriolis parameter, but also to the ratio of the dense water depth to total water depth. The dense water coastal current is generated by the along-shelf baroclinic pressure gradient. Its dynamics can be separated into two stages: (i) near the source region, where viscous terms are negligible, its speed is proportional to the reduced gravity wave speed and (ii) in the far field, where bottom drag becomes important and balances the pressure gradient, the velocity i...