| Yuan Yaochu,Arata Kaneko,Wang Huiqun,Zhu Xiaohua,Su Jilan,Noriaki Gohda,Chen Hong,Fang Tongde. 1999. Tides and short-term variabilities in the Kuroshio west of Yonakuni-jima. Acta Oceanologica Sinica, (3):311－324 |
| Tides and short-term variabilities in the Kuroshio west of Yonakuni-jima |
| Tides and short-term variabilities in the Kuroshio west of Yonakuni-jima |
| Received:October 20, 1998 Revised:December 12, 1998 |
| DOI： |
| Key words:Kuroshio current measurement wind data spectral estimates 3-5 d period |
| 中文关键词: Kuroshio current measurement wind data spectral estimates 3-5 d period |
| 基金项目:This study was supported by the National Natural Science Foundation of China under contract No. 49476278. |
| Author Name | Affiliation | | Yuan Yaochu | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | Arata Kaneko | Department of Environmental Sciences, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan | | Wang Huiqun | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | Zhu Xiaohua | Chugoku National Industrial Research Institute, Kure, Hiroshima 739-0197, Japan | | Su Jilan | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | Noriaki Gohda | Department of Environmental Sciences, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan | | Chen Hong | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | Fang Tongde | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: |
| Direct current measurements at the mooring station M southwest of Yonakuni-jima are carried out from May 18 to June 1,1996.The observed Kuroshio Current at 290 and 594 m depths of the mooring station M is quite steady during the period of observation.The rotary spectral estimates of the current data by the maximum entropy method show that there are prominent diurnal and semidiumal spectral peaks.The semidiumal tide is predominant at 290 m depth while there is the current fluctuation with the inertial period except for the tidal oscillation at 594 m depth.There are also peaks at the period of 4-7 d.There is a significant coherence between two time series of currents at 290 and 594 m depths in the period range of 3-5 d.The Japan Meteorological Agency (JMA) wind data during the same period as the oceanic measurement are used in comparison with the current meter data.Rotary spectral estimates for the wind data show significant peaks at the period of 3-5 d.It is concluded from the cross spectra between the wind and the current that the current fluctuation of 3-5 d period at 290 m depth response to the wind fluctuation of the same periods with time lags smaller than 1 d. |
| 中文摘要: |
| Direct current measurements at the mooring station M southwest of Yonakuni-jima are carried out from May 18 to June 1,1996.The observed Kuroshio Current at 290 and 594 m depths of the mooring station M is quite steady during the period of observation.The rotary spectral estimates of the current data by the maximum entropy method show that there are prominent diurnal and semidiumal spectral peaks.The semidiumal tide is predominant at 290 m depth while there is the current fluctuation with the inertial period except for the tidal oscillation at 594 m depth.There are also peaks at the period of 4-7 d.There is a significant coherence between two time series of currents at 290 and 594 m depths in the period range of 3-5 d.The Japan Meteorological Agency (JMA) wind data during the same period as the oceanic measurement are used in comparison with the current meter data.Rotary spectral estimates for the wind data show significant peaks at the period of 3-5 d.It is concluded from the cross spectra between the wind and the current that the current fluctuation of 3-5 d period at 290 m depth response to the wind fluctuation of the same periods with time lags smaller than 1 d. |
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