期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 14, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL093829
关键词
steric height; mesoscale eddies; submesoscales; internal gravity waves; SWOT
资金
- National Natural Science Foundation of China (NSFC) [42076004, 41706005, 91958205, 91858203]
- National Key Research and Development Program of China (NRDP) [2018YFA0605702, 2016YFC1402605]
- Fundamental Research Funds for the Central Universities [202041009, 201861006, 202013028]
- NSFC [41622601, 91858201]
- NRDP [2016YFC1401404]
Based on 2-year moored measurements in the northeastern South China Sea, this study quantified the contributions of multiscale dynamic processes to steric height at 60 m. The analysis showed that different dynamic processes have different relative contributions to steric height, and their effects vary seasonally.
Based on 2-year moored measurements in the northeastern South China Sea, contributions of multiscale dynamic processes to steric height (SH) at 60 m are quantified. It shows that on average, root-mean-squared (RMS) SHs of mesoscales, submesoscales, diurnal and semidiurnal internal tides (ITs), and supertidal internal gravity waves (IGWs) are 7.56, 1.01, 1.19, 2.84, and 1.46 cm, respectively, with their respective relative contributions of 53.8%, 7.2%, 8.5%, 20.2%, and 10.4%. The SHs of ITs and supertidal IGWs are dominated by stationary and nonstationary components, respectively. Seasonally, mesoscales and submesoscales show larger RMS SHs in winter than summer but the opposite occurs for ITs and supertidal IGWs. Although the RMS SH of submesoscales exceeds nonstationary ITs in winter, it is much smaller than the sum of nonstationary ITs and supertidal IGWs. Therefore, to detect submesoscales using SWOT data, approaches to remove the SHs of nonstationary ITs and supertidal IGWs are called for.
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