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首页> 外文期刊>Journal of Physical Oceanography >Bathymetric Influence on the Coastal Sea Level Response to Ocean Gyres at Western Boundaries
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Bathymetric Influence on the Coastal Sea Level Response to Ocean Gyres at Western Boundaries

机译：等深线对西部边界沿海海平面对海洋环流响应的影响

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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 -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.
机译：我们的目的是研究大陆架和斜坡的存在如何改变内部海洋动力学与西部边界（沿海）海平面之间的关系。假设在海岸上具有垂直侧壁的平底盆地的假设掩盖了深度在作用于海岸的净力中发挥的作用。然后发展出了一个线性平面理论，该平面理论描述了可变深度测深法上的海平面传输，类似于热流体的稳定对流扩散。发现该参数将摩擦参数r与测深H和宽度相关联，可以确定内部海平面对沿海海平面的贡献，其中较小的边界可以提供最大的穿透力，而最大的隔离可以是最大的。在较小的（无限摩擦）极限中，摩擦边界层延伸至远海，而沿海海平面则趋向于垂直侧壁解。添加简单的分层可产生完全相同的结果，但有效深度减小，因此穿透力增强。通过允许温跃层深度的微弱非线性变化，可以进一步提高渗透率。相对于整体秤，更宽和更浅的货架也显示出最大的穿透力，以达到的实际价值。该理论暗示，测深法的分辨率和摩擦的表示可能会对模拟的沿海海平面产生重大影响，这使粗分辨率模型能够准确表示确定动态沿海海平面的过程的能力受到质疑。

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