| Fang Xinhua,Jiang Mingshun,Du Tao. 2000. Dispersion relation of internal waves in the western equatorial Pacific Ocean. Acta Oceanologica Sinica, (4):37－45 |
| Dispersion relation of internal waves in the western equatorial Pacific Ocean |
| Dispersion relation of internal waves in the western equatorial Pacific Ocean |
| Received:October 20, 1999 Revised:May 26, 2000 |
| DOI： |
| Key words:Internal wave dispersion relation equatorial ocean the western Pacific Ocean |
| 中文关键词: Internal wave dispersion relation equatorial ocean the western Pacific Ocean |
| 基金项目:This study was supported by the National Natural Science Foundation of China, Project under contract No. 49676275,No. 49976002 and Research Fund for the Doctoral Program of Higher Education under contract No.98042306. |
| Author Name | Affiliation | | Fang Xinhua | Physical Oceangraphy Laboratory, Institute of Physical Oceanography, Ocean University of Qingdao, Qingdao 266003, China | | Jiang Mingshun | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | | Du Tao | Physical Oceangraphy Laboratory, Institute of Physical Oceanography, Ocean University of Qingdao, Qingdao 266003, China |
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| Abstract: |
| Based mainly on TOGA COARE data, that is, the CI'D data from R/V Xiangyanghong No.5 (Pu et al.,1993),the temperature and current data from the Woods Hole mooring and other deep current data, the layered numerical profiles of buoyancy frequency and mean current components are figured out.A numerical method calculating internal wave dispersion relation without background shear current, used by Fliegel and Hunkins (1975),is improved to be fit for the internal wave equation with mean currents and their second derivatives.The dispersion relations and wave functions of the long crested internal wave progressing in any direction can be calculated inveniently by using the improved method.A comparison between the calculated dispersion relation in the paper and the dispersion relation in GM spectral model of ocean internal waves (Garret and Munk, 1972) is performed.It shows that the mean currents are important to the dispersion relation of internal waves in the western equatorial Pacific Ocean and that the currents make the wave progressing co-directional with (against) the currents stretched (shrink).The influence of the mean currents on dispersion relation is much stronger than that of their second derivatives, but that on wave function is less than that of their second derivatives.The influences on wave functions result in the change of vertical wavenumber, that is, making the wave function stretch or shrink.There exists obvious turning depth but no significant critical layer absorption is found. |
| 中文摘要: |
| Based mainly on TOGA COARE data, that is, the CI'D data from R/V Xiangyanghong No.5 (Pu et al.,1993),the temperature and current data from the Woods Hole mooring and other deep current data, the layered numerical profiles of buoyancy frequency and mean current components are figured out.A numerical method calculating internal wave dispersion relation without background shear current, used by Fliegel and Hunkins (1975),is improved to be fit for the internal wave equation with mean currents and their second derivatives.The dispersion relations and wave functions of the long crested internal wave progressing in any direction can be calculated inveniently by using the improved method.A comparison between the calculated dispersion relation in the paper and the dispersion relation in GM spectral model of ocean internal waves (Garret and Munk, 1972) is performed.It shows that the mean currents are important to the dispersion relation of internal waves in the western equatorial Pacific Ocean and that the currents make the wave progressing co-directional with (against) the currents stretched (shrink).The influence of the mean currents on dispersion relation is much stronger than that of their second derivatives, but that on wave function is less than that of their second derivatives.The influences on wave functions result in the change of vertical wavenumber, that is, making the wave function stretch or shrink.There exists obvious turning depth but no significant critical layer absorption is found. |
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