| XIAO Bin,QIAO Fangli,SHU Qi. 2016. The performance of a z-level ocean model in modeling the global tide. Acta Oceanologica Sinica, 35(11):35－43 |
| The performance of a z-level ocean model in modeling the global tide |
| 基于z坐标海洋模式的全球正压潮波数值模拟研究 |
| Received:November 07, 2015 Revised:December 08, 2015 |
| DOI：10.1007/s13131-016-0884-z |
| Key words:global tide Modular Ocean Model global tidal energy flux |
| 中文关键词: 全球潮波 数值模拟 模块化海洋数值模式 地形拖曳参数化 全球潮能通量 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | XIAO Bin | College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | QIAO Fangli | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Regional Oceanography, Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China | qiaofl@fio.org.cn | | SHU Qi | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | |
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| Abstract: |
| The performance of a z-level ocean model, the Modular Ocean Model Version 4 (MOM4), is evaluated in terms of simulating the global tide with different horizontal resolutions commonly used by climate models. The performance using various sets of model topography is evaluated. The results show that the optimum filter radius can improve the simulated co-tidal phase and that better topography quality can lead to smaller rootmean square (RMS) error in simulated tides. Sensitivity experiments are conducted to test the impact of spatial resolutions. It is shown that the model results are sensitive to horizontal resolutions. The calculated absolute mean errors of the co-tidal phase show that simulations with horizontal resolutions of 0.5° and 0.25° have about 35.5% higher performance compared that with 1° model resolution. An internal tide drag parameterization is adopted to reduce large system errors in the tidal amplitude. The RMS error of the best tuned 0.25° model compared with the satellite-altimetry-constrained model TPXO7.2 is 8.5 cm for M2. The tidal energy fluxes of M2 and K1 are calculated and their patterns are in good agreement with those from the TPXO7.2. The correlation coefficients of the tidal energy fluxes can be used as an important index to evaluate a model skill. |
| 中文摘要: |
| 本文基于z坐标海洋模式MOM4建立了全球正压潮波数值模式，研究了不同空间分辨率、地形数据及平滑方法对模拟结果的影响。结果表明，合适的滤波半径可以改善所模拟的全球潮波结构，更高质量的地形数据可以显著降低全球潮波数值模式的潮位均方根误差。敏感实验结果表明，数值模式对水平分辨率较为敏感，其中水平分辨率为0.5°和0.25°的数值模式对M2分潮迟角的模拟能力相比1°水平分辨的模式提高了35.5%。为了解决全球正压潮波数值模式中动能偏大的问题，引入了地形拖曳参数化方案，对正压潮波数值模式中所不能解析的内波的生成和破碎所导致的潮能耗散进行了合理地参数化。所建立的最终版本的全球正压潮波数值模式相比TPXO7.2的M2分潮潮位均方根误差为8.5cm。其所模拟的全球M2和K1分潮的潮能通量与TPXO7.2吻合的较好，潮能通量的相关系数可以作为衡量数值模式模拟能力的一个重要指标。 |
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