| Wang Huiqun,Yuan Yaochu,Su Jilan,Liu Yonggang. 2000. Three-dimensional numerical calculations of currents east of Taiwan Island in December 1997. Acta Oceanologica Sinica, (3):45－63 |
| Three-dimensional numerical calculations of currents east of Taiwan Island in December 1997 |
| Three-dimensional numerical calculations of currents east of Taiwan Island in December 1997 |
| Received:December 15, 1999 Revised:January 10, 2000 |
| DOI： |
| Key words:Kuroshio east of Taiwan Island currents southeast of Ryūkyū-guntōthrese-dimensional |
| 中文关键词: Kuroshio east of Taiwan Island currents southeast of Ryūkyū-guntōthrese-dimensional |
| 基金项目:This project was supported by the National Natural Science Foundation of China under contract Nos 49776287 and 49736200 and the Major State Basic Research Program under contract No.G1999043802. |
| Author Name | Affiliation | | Wang Huiqun | Key Lab of Ocean Dynamic Processese and Satellite Oceanography, State Oceanic Administration, Hangzhou 310012, China
Secon Institute of Oceanography, State Occeanic Administration, PO Box 1207, Hangzhou 310012, China | | Yuan Yaochu | Key Lab of Ocean Dynamic Processese and Satellite Oceanography, State Oceanic Administration, Hangzhou 310012, China
Secon Institute of Oceanography, State Occeanic Administration, PO Box 1207, Hangzhou 310012, China | | Su Jilan | Key Lab of Ocean Dynamic Processese and Satellite Oceanography, State Oceanic Administration, Hangzhou 310012, China
Secon Institute of Oceanography, State Occeanic Administration, PO Box 1207, Hangzhou 310012, China | | Liu Yonggang | Key Lab of Ocean Dynamic Processese and Satellite Oceanography, State Oceanic Administration, Hangzhou 310012, China
Secon Institute of Oceanography, State Occeanic Administration, PO Box 1207, Hangzhou 310012, China |
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| Abstract: |
| Based on the wind and hydrographic data obtained from the cruise of China-Japan Cooperative Research on Subtropical Gyre during December 1997,the Kuroshio east of Taiwan Island and the currents southeast of the Ryūkyū-guntō are computed by using three-dimensional diagnostic,semidiagnostic and prognostic models in the σ coordinate.The computed results show that:(1) The density and velocity fields have been adjusted when time is about 15 d,namely,the solution of semidiagnostic calculation is obtained.The quasi-steady state solution has been reached after 300 d,thus and the results of prognostic calculation got. (2) From the diagnostic calculation,the following main results can be obrained-1) There is a stronger cyclonic eddy with tongue-shaped in the region south of Taiwan Island,and the Kuroshio is located east of this cyclonic eddy.Compared with the results in July 1997,the position of the main axis of the Kuroshio moves eastward.2) There is an anticyclonic eddy south of Miyakojima,and there is a cyclonic eddy near the middle of the southern computational boundary.3) The upwelling dominates in an area of the Kuroshio near Taiwan Island.(3) Comparing the results of diagnostic calculation with those of semidiagnotic and prognostic calculations indicates that the horizontal velocity fields agree qualitatively,and there is a little difference between them in quantity.For example,the maximum horizontal velocities of the Kuroshio at the sea surface at t=0d (diagnostic),15 d (semidiagnostic) and 300 d (prgnostic) are 88.6,98.0 and 97.0 cm/s,respectively.As to the distributions of vertical components of velocity,there are some differences between them,which shows that the semidi-agnostic and prognostic results can coincide with better the salinity and temperature distributions. |
| 中文摘要: |
| Based on the wind and hydrographic data obtained from the cruise of China-Japan Cooperative Research on Subtropical Gyre during December 1997,the Kuroshio east of Taiwan Island and the currents southeast of the Ryūkyū-guntō are computed by using three-dimensional diagnostic,semidiagnostic and prognostic models in the σ coordinate.The computed results show that:(1) The density and velocity fields have been adjusted when time is about 15 d,namely,the solution of semidiagnostic calculation is obtained.The quasi-steady state solution has been reached after 300 d,thus and the results of prognostic calculation got. (2) From the diagnostic calculation,the following main results can be obrained-1) There is a stronger cyclonic eddy with tongue-shaped in the region south of Taiwan Island,and the Kuroshio is located east of this cyclonic eddy.Compared with the results in July 1997,the position of the main axis of the Kuroshio moves eastward.2) There is an anticyclonic eddy south of Miyakojima,and there is a cyclonic eddy near the middle of the southern computational boundary.3) The upwelling dominates in an area of the Kuroshio near Taiwan Island.(3) Comparing the results of diagnostic calculation with those of semidiagnotic and prognostic calculations indicates that the horizontal velocity fields agree qualitatively,and there is a little difference between them in quantity.For example,the maximum horizontal velocities of the Kuroshio at the sea surface at t=0d (diagnostic),15 d (semidiagnostic) and 300 d (prgnostic) are 88.6,98.0 and 97.0 cm/s,respectively.As to the distributions of vertical components of velocity,there are some differences between them,which shows that the semidi-agnostic and prognostic results can coincide with better the salinity and temperature distributions. |
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