Eddy covariance measurements of turbulent fluxes in the surf zone
文献类型：期刊论文
| 作者 | Qi, Yongfeng; Shang, Xiaodong; Chen, Guiying; Yu, Linghui |
| 刊名 | ACTA OCEANOLOGICA SINICA
 |
| 出版日期 | 2020 |
| 卷号 | 39期号:3页码:63 |
| 关键词 | eddy covariance turbulent fluxes surface gravity waves cospectrum tides |
| ISSN号 | 0253-505X |
| 英文摘要 | 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 similar to 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, k(0), and roll-off wavelengths, lambda(0) (where lambda(0)=2 pi/k(0)), which were estimated as the horizontal length scales of the dominant flux-carrying turbulent eddies, indicated that the lambda(0) 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 turulence. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18341]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 作者单位 | Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qi, Yongfeng,Shang, Xiaodong,Chen, Guiying,et al. Eddy covariance measurements of turbulent fluxes in the surf zone[J]. ACTA OCEANOLOGICA SINICA,2020,39(3):63, 72. |
| APA | Qi, Yongfeng,Shang, Xiaodong,Chen, Guiying,&Yu, Linghui.(2020).Eddy covariance measurements of turbulent fluxes in the surf zone.ACTA OCEANOLOGICA SINICA,39(3),63. |
| MLA | Qi, Yongfeng,et al."Eddy covariance measurements of turbulent fluxes in the surf zone".ACTA OCEANOLOGICA SINICA 39.3(2020):63. |
入库方式： OAI收割
来源：南海海洋研究所
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