| 摘要: |
| 使用细尺度参数化方法和2015—2019年全球的Argo温盐剖面资料，分析了风生近惯性能通量和地形粗糙度对全球海洋300—600 m深度的涡流扩散系数的影响。结果表明，在30°—45°N区域，月均涡流扩散系数与月平均风生近惯性能通量随时间的变化趋势较为一致，相关系数可达0.43，前者滞后1个月，与后者的相关系数可达0.65，但在其他区域二者的变化趋势相差较大；相较于中纬度和北半球，低纬度和南半球的地形粗糙度与扩散系数的相关关系更好。基于这些分析结果，拟合并建立了30°—45°N区域300—600 m深度的涡流扩散系数与风生近惯性能通量和地形粗糙度的关系式。而且，用此关系式和细尺度参数化方法计算出来的扩散系数平均量级差异为0.47，且91%的值偏差小于一个量级。据此，我们给出了1—12月30°—45°N太平洋区域的涡流扩散系数的网格化结果。 |
| 关键词: 海洋混合 参数化 风生近惯性能通量 地形粗糙度 |
| DOI：10.11693/hyhz20210100017 |
| 分类号:P731 |
| 基金项目:国家重点研发计划项目，2016YFC1401404号，2017YFA0604102号。 |
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| INFLUENCE OF WIND-INDUCED NEAR-INERTIAL ENERGY FLUX AND TOPOGRAPHIC ROUGHNESS ON OCEAN INTERNAL MIXING |
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CHEN Juan, QIAO Meng-Tian, CAO An-Zhou, SONG Jin-Bao
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Ocean College, Zhejiang University, Zhoushan 316021, China
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| Abstract: |
| Using the fine-scale parameterization method and the global Argo data in 2015-2019, the influence of wind-induced near-inertial energy flux and topographic roughness on ocean internal eddy diffusion in 300-600 m depth were analyzed. Results show that, in the Pacific region of 30°-45°N, the trend of the monthly average eddy diffusion coefficient was consistent with the monthly average wind-induced near-inertial energy flux, and the correlation coefficient was ~0.43. The correlation coefficient between the former with a lag of one month and the latter was up to 0.65. However, the trend of the two was quite different in other regions. The correlation between the topographic roughness and eddy diffusion coefficient in the low latitude and southern hemisphere was greater than that of the mid-latitude and northern hemisphere. The analysis shows, in the region of 30°-45°N, the equation describing the relationship between the eddy diffusion coefficient in 300-600 m depth and the wind-induced near-inertial energy flux and topographic roughness was established. The difference between the average magnitude of eddy diffusion coefficient calculated by this formula and by the fine-scale parameterization method was 0.47, and 91% of the value deviation was within one order of magnitude. At last, the gridded results of eddy diffusion coefficients in the Pacific region of 30°-45°N from January to December were given. |
| Key words: ocean mixing parameterization wind-induced near-inertial energy flux topographic roughness |
