分隐式海洋模型中的双向嵌套:NCOM

IF 1.9 4区 地球科学 Q2 ENGINEERING, OCEAN Journal of Atmospheric and Oceanic Technology Pub Date : 2023-05-05 DOI:10.1175/jtech-d-22-0112.1
Jie Yu, C. Blain, P. Martin, T. Campbell
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引用次数: 0

摘要

介绍了在一个分裂隐式海洋模型——海军沿海海洋模型(NCOM)中双向嵌套的方法、实现和评估。重点是应用从细网格巢(子网格)到粗网格(父网格)的反馈域的策略。在动态界面与反馈界面的适当分离上,特别需要注意地表高程反馈界面。一个特别的问题是在反馈中三维斜压速度和二维正压传输之间的不一致。这种差异本质上与测深、深度整合以及对空间网格点进行平均的需要有关。提出了一种简单的补救措施,并在实际的沿海应用中证明是有效和必要的。在完全双向嵌套的基础上,提出了一种简化的双向嵌套方法,该方法仅从巢中反馈温度和盐度,并假设速度场根据地转平衡自调整。利用理想基准、斜压涡旋的传播和对墨西哥湾东北部密西西比河流出的应用,包括与现有观测结果的比较,对这两种方法的性能进行了评估。讨论了双向嵌套的计算效率及其对开放边界条件的噪声抑制敏感性。
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Two-way nesting in a split-implicit ocean model: NCOM
Presented is the approach, implementation, and evaluation of two-way nesting in a split-implicit ocean model, the Navy Coastal Ocean Model (NCOM). Emphasis is on the strategies applied to feed back fields from the fine-mesh nest (child grid) to the coarse-mesh (parent grid). On an appropriate separation of dynamic and feedback interfaces, attention is especially needed for the feedback interface of surface elevation. One particular issue addressed is the inconsistency between the 3D baroclinic velocities and 2D barotropic transports in the feedback. The discrepancy is inherently associated with bathymetry, depth-integration, and the need to average over spatial grid points. A simple remedy is proposed and proven to be effective and necessary in realistic coastal applications. In addition to the full two-way nesting, a simplified two-way nesting approach is provided in which only the temperature and salinity are fed back from the nest, and the velocity fields are assumed to self-adjust according to the geostrophic balance. The performance of both approaches is evaluated using the idealized benchmark, propagation of a baroclinic vortex, and an application to the Mississippi River outflowin the northeast Gulf ofMexico, including a comparison with available observations. Discussions are also made on the computational efficiency of the two-way nesting and its sensitivity to the open boundary conditions in regard to noise suppression.
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来源期刊
CiteScore
4.50
自引率
9.10%
发文量
135
审稿时长
3 months
期刊介绍: The Journal of Atmospheric and Oceanic Technology (JTECH) publishes research describing instrumentation and methods used in atmospheric and oceanic research, including remote sensing instruments; measurements, validation, and data analysis techniques from satellites, aircraft, balloons, and surface-based platforms; in situ instruments, measurements, and methods for data acquisition, analysis, and interpretation and assimilation in numerical models; and information systems and algorithms.
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