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| Measurement of the current and spectral analysis on the continental shelf in the East China Sea | |
| 作者姓名： | LIU Yonggang YUAN Yaochu LIU Cho-Teng CHEN Hong |
| 作者单位： | LIU Yonggang，YUAN Yaochu，LIU Cho-Teng，CHEN Hong College of Marine Science，University of South Florida，U S A Second Institute of Oceanography，State Oceanic Administration，Hangzhou 310012，China Key Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration，Hangzhou 310012，China Institute of Oceanography，Taiwan University，Taipei，China |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
| 摘 要： | Direct measurements of current velocity and water temperature were undertaken at the mooring Sta. M (125°29.38' N, 31°49.70' E) on the continental shelf area in the East China Sea in June 1999 by R/V Xiangyanghong 14. The relationship between various time series of oceanic fluctuations is calculated by spectral analysis. The major results are as follows: (1) an average (u,v) of (6.9,-3.0 cm/s) at the 30 m depth is obtained during the 9-day observation, and that at the 45 m depth is (3.7,-1.1 cm/s), i. e., the mean flows are southeastward at both the 30 and 45 m depths;the currents become stronger gradually during the observation period; this may be mainly attributed to the transition of the tidal currents from neap to spring; (2)semidiurnal fluctuation is the most dominant in the current fluctuations, and rotates mainly clockwise; in the next place, there is also diurnal fluctuation;the local inertial period is close to the period of diurnal fluctuation, and an inertial motion is clockwise; thus, loca |
| 关 键 词： | 光谱测量 潮汐 海洋观测 南海 中国 |
| 收稿时间： | 2003/11/11 0:00:00 |
| 修稿时间： | 2004/1/20 0:00:00 |
Measurement of the current and spectral analysis on the continental shelf in the East China Sea |
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| LIU Yonggang,YUAN Yaochu,LIU Cho-Teng,CHEN Hong.Measurement of the current and spectral analysis on the continental shelf in the East China Sea[J].Acta Oceanologica Sinica,2004,23(2):201-212. | |
| Authors: | LIU Yonggang YUAN Yaochu LIU Cho-Teng and CHEN Hong |
| Institution: | 1. College of Marine Science,University of South Florida ,U S A;Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China 2. Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China;Key Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration,Hangzhou 310012,China 3. Institute of Oceanography,Taiwan University,Taipei,China 4. Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China |
| Abstract: | Direct measurements of current velocity and water temperature were undertaken at the mooring Sta. M (125°29.38′ N,31°49.70′ E) on the continental shelf area in the East China Sea in June 1999 by R/V Xiangyanghong 14. The relationship between various time series of oceanic fluctuations is calculated by spectral analysis. The major results are as follows: (1) an average (u,v) of (6.9,-3.0 cm/s) at the 30 m depth is obtained during the 9-day observation, and that at the 45 m depth is (3.7,-1.1 cm/s), i. e., the mean flows are southeastward at both the 30 and 45 m depths;the currents become stronger gradually during the observation period; this may be mainly attributed to the transition of the tidal currents from neap to spring; (2)semidiurnal fluctuation is the most dominant in the current fluctuations, and rotates mainly clockwise; in the next place, there is also diurnal fluctuation;the local inertial period is close to the period of diurnal fluctuation, and an inertial motion is clockwise; thus, local inertial motion combines with diurnal fluctuation, and makes the spectral peaks in clockwise components much higher than those in counterclockwise ones;except for the fluctuations of above main periods, there is also the peak at 3 d period for counterclockwise components in the upper and lower layers; (3) the calculation of cross spectra between two time series of current velocities at the 30 and 45 m depths shows that both the current fluctuations at the 30 and 45 m depths are much alike, i. e.,they are synchro; this shows that the flow field here is rather vertically homogeneous; (4)power spectra of temperature time series at both the 30 and 45 m depths show that the semidiurnal peak is the most predominant, and the second highest peak is the diurnal period; besides spectral peaks at above periods, there are also obvious spectral peaks at 6.8 h and 2 d; (5)plots of temperature time series at 16,30,35,45 and 50 m depths show that the temporal variations of temperature at these depths are synchro, which are like those in the velocity field; temperature records also show a gradual rise in temperature, which are also like those in the velocity field. |
| Keywords: | East China Sea current on the continental shelf measurements of current by the mooring system |
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