Detecting Instantaneous Tidal Signals in Ocean Models Utilizing Streaming Band-Pass Filters

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Advances in Modeling Earth Systems Pub Date : 2024-10-13 DOI:10.1029/2024MS004319
Chengzhu Xu, Edward D. Zaron
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Abstract

Through the implementation of a streaming filter, output of numerical ocean simulations can be band-pass filtered at tidal frequencies while the model is running, yielding time series of sinusoidal motions consisting of tidal signals in the filter's target frequency band. The filtering algorithm is developed from a system of two ordinary differential equations that represents the motion of a damped harmonic oscillator. The filter's response to a broadband input signal is unity at its target frequency but vanishes toward the low and high frequency limits. The decay of the filter response is controlled by a dimensionless parameter, which determines the filter's bandwidth. As a result, the filter allows signals within a small frequency band around its target frequency to pass through, while blocking signals outside of its target frequency band. In this work, the filtering algorithm is implemented into the barotropic solver of the Modular Ocean Model version 6 (MOM6) for determining the instantaneous tidal velocities of the semi-diurnal and diurnal tides. Utilizing the filters, the frequency-dependent internal wave drag is applied to the semi-diurnal and diurnal frequency bands separately. The simulation results suggest that the performance of the algorithm is consistent with the filter transfer function in Fourier space. Potential applications of the algorithm also include de-tiding the model output for nested regional ocean models, especially those for the purpose of operational forecasting.

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利用流式带通滤波器检测海洋模型中的瞬时潮汐信号
通过实施流滤波器,可以在模型运行时对海洋数值模拟输出的潮汐频率进行带通滤波,从而得到由滤波器目标频带内潮汐信号组成的正弦运动时间序列。滤波算法是根据表示阻尼谐振子运动的两个常微分方程系统开发的。滤波器对宽带输入信号的响应在其目标频率上是统一的,但在低频和高频极限上会消失。滤波器响应的衰减由一个无量纲参数控制,该参数决定了滤波器的带宽。因此,滤波器允许目标频率附近小频带内的信号通过,同时阻挡目标频带外的信号。在这项工作中,滤波算法被应用于模块化海洋模式第 6 版(MOM6)的气压求解器中,用于确定半日潮和日潮的瞬时潮汐速度。利用滤波器,对半日潮和日潮频带分别施加频率相关的内波阻力。模拟结果表明,该算法的性能与傅里叶空间的滤波传递函数一致。该算法的潜在应用还包括为嵌套的区域海洋模式,特别是以业务预报为目的的模式输出去导。
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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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