Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model
Dissipation and Bathymetric Sensitivities in an Unstructured Mesh Global Tidal Model
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非结构化网格全球潮汐模型中的耗散和测深灵敏度
DOI：
10.1029/2021jc018178
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Myers, Edward
中科院分区：
文献类型：
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作者：
Blakely, Coleman P.;Ling, Guoming;Pringle, William J.;Contreras, María Teresa;Wirasaet, Damrongsak;Westerink, Joannes J.;Moghimi, Saeed;Seroka, Greg;Shi, Lei;Myers, Edward
利用高分辨率非结构网格有限元数值模式研究了正压潮汐模式中全球潮耗散的机制和地理分布。网格分辨率在2至25公里之间，特别侧重于内陆架和陡峭的测深梯度。潮汐响应水深变化的敏感性进行了检查，把背景下的摩擦过程的敏感性。我们确认，伦讷冰架显着影响大西洋潮汐，但也发现，测深在哈德逊湾系统是一个关键的控制。我们遵循顺序摩擦参数优化过程，并使用TPXO9数据同化的潮汐高程作为参考解决方案。从模拟的速度和深度，全球模型内的耗散估计，使我们能够以高分辨率查明耗散。边界层耗散极为集中，海洋的1.4%占总量的90%。内潮摩擦分布较多，占海洋的16.7%，占总量的90%。通常，高度区域性的耗散会影响流域尺度甚至海洋范围的潮汐。优化的边界层摩擦参数与当地的物理特性相关性很好，与高摩擦系数与充满活力的潮汐区，深海岛链，和冰覆盖区。全球复M2潮误差在沃茨为1.94 cm。总的全球边界层和内部潮汐耗散的估计，分别为1.83和1.49 TW。这延续了文献中将更多耗散归因于内潮的趋势。
The mechanisms and geographic distribution of global tidal dissipation in barotropic tidal models are examined using a high resolution unstructured mesh finite element model. Mesh resolution varies between 2 and 25 km and is especially focused on inner shelves and steep bathymetric gradients. Tidal response sensitivities to bathymetric changes are examined to put into context response sensitivities to frictional processes. We confirm that the Ronne Ice Shelf dramatically affects Atlantic tides but also find that bathymetry in the Hudson Bay system is a critical control. We follow a sequential frictional parameter optimization process and use TPXO9 data‐assimilated tidal elevations as a reference solution. From simulated velocities and depths, dissipation within the global model is estimated and allows us to pinpoint dissipation at high resolution. Boundary layer dissipation is extremely focused with 1.4% of the ocean accounting for 90% of the total. Internal tide friction is much more distributed with 16.7% of the ocean accounting for 90% of the total. Often highly regional dissipation can impact basin‐scale and even ocean wide tides. Optimized boundary layer friction parameters correlate very well with the physical characteristics of the locality with high friction factors associated with energetic tidal regions, deep ocean island chains, and ice covered areas. Global complex M2tide errors are 1.94 cm in deep waters. Total global boundary layer and internal tide dissipation are estimated, respectively, at 1.83 and 1.49 TW. This continues the trend in the literature toward attributing more dissipation to internal tides.