| 海浪区湍流通量的涡度协方差观测 |
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| 引用本文： | 戚永锋,尚晓东,陈桂英,余凌晖. 海浪区湍流通量的涡度协方差观测[J]. 海洋学报(英文版), 2020, 39(3): 63-72. DOI: 10.1007/s13131-020-1562-8 |
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| 作者姓名： | 戚永锋 尚晓东 陈桂英 余凌晖 |
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| 作者单位： | 中国科学院南海海洋研究所, 热带海洋环境国家重点实验室, 广州, 510301,中国科学院南海海洋研究所, 热带海洋环境国家重点实验室, 广州, 510301,中国科学院南海海洋研究所, 热带海洋环境国家重点实验室, 广州, 510301,中国科学院南海海洋研究所, 热带海洋环境国家重点实验室, 广州, 510301 |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41876023, 41630970 and 41876022; the Instrument Developing Project of the Chinese Academy of Sciences under contract No. YZ201432; the Guangzhou Science and Technology Project under contract No. 201707020037; the National Key R&D Plan of China under contract Nos 2017YFC0305804 and 2017YFC0305904. |
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| 摘 要： | Turbulent eddies play a critical role in oceanic flows. Direct measurements of turbulent eddy fluxes beneath the sea surface were taken to study the direction of flux-carrying eddies as a means of supplementing our understanding of vertical fluxes exchange processes and their relationship to tides. The observations were made at 32 Hz at a water depth of ~1.5 m near the coast of Sanya, China, using an eddy covariance system, which mainly consists of an acoustic doppler velocimeter(ADV) and a fast temperature sensor. The cospectra-fit method-an established semi-empirical model of boundary layer turbulence to the measured turbulent cospectra at frequencies below those of surface gravity waves-was used in the presence of surface gravity waves to quantify the turbulent eddy fluxes(including turbulent heat flux and Reynolds stress). As much as 87% of the total turbulent stress and 88% of the total turbulent heat flux were determined as being at band frequencies below those of surface gravity waves. Both the turbulent heat flux and Reynolds stress showed a daily successive variation;the former peaked during the low tide period and the later peaked during the ebb tide period.Estimation of roll-off wavenumbers, k0, and roll-off wavelengths, λ0(where λ0=2π/k0), which were estimated as the horizontal length scales of the dominant flux-carrying turbulent eddies, indicated that the λ0 of the turbulent heat flux was approximately double that of the Reynolds stress. Wavelet analysis showed that both the turbulent heat flux and the Reynolds stress have a close relationship to the semi-diurnal and diurnal tides, and therefore indicate the energy that is transported from tides to turbulence.
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| 关 键 词： | EDDY COVARIANCE TURBULENT FLUXES surface gravity waves cospectrum TIDES |
| 收稿时间： | 2019-07-04 |
Eddy covariance measurements of turbulent fluxes in the surf zone |
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| Qi,Yongfeng,Shang,Xiaodong,Chen,Guiying,Yu,Linghui. Eddy covariance measurements of turbulent fluxes in the surf zone[J]. Acta Oceanologica Sinica, 2020, 39(3): 63-72. DOI: 10.1007/s13131-020-1562-8 |
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| Authors: | Qi Yongfeng Shang Xiaodong Chen Guiying Yu Linghui |
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| Affiliation: | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | Acta Oceanologica Sinica - Turbulent eddies play a critical role in oceanic flows. Direct measurements of turbulent eddy fluxes beneath the sea surface were taken to study the direction of... |
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| Keywords: | eddy covariance turbulent fluxes surface gravity waves cospectrum tides |
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