Bathymetric Influence on the Coastal Sea Level Response to Ocean Gyres at Western Boundaries
Bathymetric Influence on the Coastal Sea Level Response to Ocean Gyres at Western Boundaries
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DOI：
10.1175/jpo-d-18-0007.1
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发表时间：
2018-12
影响因子：
3.5
通讯作者：
A. Wise;C. Hughes;J. Polton
中科院分区：
文献类型：
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作者：
A. Wise;C. Hughes;J. Polton
这是我们的目的，本文探讨如何大陆架和斜坡的存在改变了内部海洋动力学和西部边界（沿海）海平面之间的关系。假设一个平底盆地与垂直侧壁在海岸被示出隐藏的作用，深度在作用在海岸上的净力。一个线性的β平面理论，然后发展描述的传输的海平面在可变深度测深类似于稳定的对流扩散的热流体。该参数，有关的摩擦参数r的测深深度H和宽度，被发现以确定沿海海平面的贡献，与小的最大渗透和大的最大绝缘。在小摩擦（无穷大摩擦）的限制，摩擦边界层延伸到远离近海，和沿海海平面倾向于垂直侧壁解决方案。增加简单的分层产生完全相同的结果，但有效深度减少，从而提高了穿透力。通过允许温跃层深度的弱非线性变化，可以进一步增强渗透。相对于整体尺度，更宽和更浅的货架也被证明可以最大限度地提高渗透率。该理论意味着，分辨率的测深和摩擦的代表性可以有很大的影响，模拟沿海海平面，呼吁质疑粗分辨率模型的能力，以准确地表示过程，确定动态沿海海平面。
It is our aim with this paper to investigate how the presence of a continental shelf and slope alters the relationship between interior ocean dynamics and western boundary (coastal) sea level. The assumption of a flat-bottomed basin with vertical sidewall at the coast is shown to hide the role that depth plays in the net force acting on the coast. A linear β-plane theory is then developed describing the transmission of sea level over variable depth bathymetry as analogous to the steady advection–diffusion of a thermal fluid. The parameter , relating the friction parameter r to the bathymetry depth H and width , is found to determine the contribution of interior sea level to coastal sea level, with small giving maximum penetration and large maximum insulation. In the small (infinite friction) limit the frictional boundary layer extends far offshore, and coastal sea level tends toward the vertical sidewall solution. Adding simple stratification produces exactly the same result but with reduced effective depth and hence enhanced penetration. Penetration can be further enhanced by permitting weakly nonlinear variations of thermocline depth. Wider and shallower shelves relative to the overall scales are also shown to maximize penetration for realistic values of . The theory implies that resolution of bathymetry and representation of friction can have a large impact on simulated coastal sea level, calling into question the ability of coarse-resolution models to accurately represent processes determining the dynamic coastal sea level.