| Optimal estimation of zonal velocity and transport through Luzon Strait using variational data assimilation technique |
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| 作者姓名： | 兰健 鲍献文 高郭平 |
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| 作者单位： | PhysicalOceanographyLaboratory,OceanUniversityofChina,Qingdao266003,China |
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| 基金项目： | Supported by the Major State Basic Research Program (No. G1999043810)，Open Laboratory for Tropical Marine Environmental Dynamics (LED)，South China Sea Institute of Oceanology，Chinese Academy of Sciences，and the NSFC (No. 40306004). |
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| 摘 要： | A P-vector method was optimized using variational data assimilation technique, with which the vertical structures and seasonal variations of zonal velocities and transports were investigated. The results showed that westward and eastward flowes occur in the Luzon Strait in the same period in a year. How ever thenet volume transport is westward. In the upper level (0m -- -500m), the westward flow exits in the middle and south of the Luzon Strait, and the eastward flow exits in the north. There are two centers of westward flow and one center of eastward flow. In the middle of the Luzon Strait, westward and eastward flowes appear alternately in vertical direction. The westward flow strengthens in winter and weakens in summer. The net volume transport is strong in winter (5.53 Sv) but weak in summer (0.29 Sv). Except in summer, the volume transport in the upper level accounts for more than half of the total volume transport (0m -- bottom). In summer, the net volum etransport in the upper level is eastward (1.01 Sv), but westward underneath.
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| 关 键 词： | 中国南海 吕宋海峡 带状传送速率 数字变更吸收 地转风平衡 偏微分方程 P-向量法 |
| 收稿时间： | 26 February 2003 |
| 修稿时间： | 28 April 2003 |
Optimal estimation of zonal velocity and transport through Luzon Strait using variational data assimilation technique |
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| Lan?Jian,Bao?Xianwen,Gao?Guoping.Optimal estimation of zonal velocity and transport through Luzon Strait using variational data assimilation technique[J].Chinese Journal of Oceanology and Limnology,2004,22(4):335-339. |
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| Authors: | Lan Jian Bao Xianwen Gao Guoping |
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| Institution: | (1) Physical Oceanography Laboratory, Ocean University of China, 266003 Qingdao, China |
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| Abstract: | A P-vector method was optimized using variational data assimilation technique, with which the vertical structures and seasonal variations of zonal velocities and transports were investigated. The results showed that westward and eastward flowes occur in the Luzon Strait in the same period in a year. However the net volume transport is westward. In the upper level (0m -500m),the westward flow exits in the middle and south of the Luzon Strait, and the eastward flow exits in the north. There are two centers of westward flow and one center of eastward flow. In the middle of the Luzon Strait, westward and eastward flowes appear alternately in vertical direction. The westward flow strengthens in winter and weakens in summer. The net volume transport is strong in winter (5.53 Sv) but weak in summer (0.29 Sv). Except in summer, the volume transport in the upper level accounts for more than half of the total volume transport (0m bottom). In summer, the net volume transport in the upper level is eastward (1.01 Sv), but westward underneath. |
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| Keywords: | South China Sea Luzon Strait zonal velocity and transport variational data assimilation technique |
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