| Optimal estimation of absolute geostrophic velocity field in vicinity of the Luzon Strait using variational data assimilation technique |
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| 作者姓名： | Lan Jian Wang Dongxiao |
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| 作者单位： | Lan Jian，Wang Dongxiao1. Department of Oceanography，Ocean University of Qingdao，Oingdao 266003，China2. Laboratory for Tropical Marine Environmental Dynamics，South China Sea Institute of Oceanology，Chinese Academy of Sciences，Guangzhou 510301，Chin |
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| 基金项目： | This work was supported by the knowledge Innovation Project of the Chinese Academy of Sciences under contract Grant No. KZCX2- 205)，the National Natural Science Foundation of China under contract Grand No. 40106002. |
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| 摘 要： | A P - vector method is optimized using the variational data assimilation technique(VDAT). The absolute geostrophic velocity fields in the vicinity of the Luzon Strait (LS) are calculated, the spatial structures and seasonal variations of the absolute geostrophic velocity field are investigated. Our results show that the Kuroshio enters the South China Sea (SCS) in the south and middle of the Luzon Strait and flows out in the north, so the Kuroshio makes a slight clockwise curve in the Luzon Strait, and the curve is strong in winter and weak in summer. During the winter, a westward current appears in the surface, and locates at the west of the Luzon Strait. It is the north part of a cyclonic gyre which exits in the northeast of the SCS; an anti-cyclonic gyre occurs on the intermediate level, and it exits in the northeast of the SCS, and an eastward current exits in the southeast of the anti-cyclonic gyre.
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| 关 键 词： | The South China Sea the Luzon Strait variational data assimilation technique |
| 收稿时间： | 2001/10/10 0:00:00 |
| 修稿时间： | 2002/2/20 0:00:00 |
Optimal estimation of absolute geostrophic velocity field in vicinity of the Luzon Strait using variational data assimilation technique |
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| Lan Jian,Wang Dongxiao.Optimal estimation of absolute geostrophic velocity field in vicinity of the Luzon Strait using variational data assimilation technique[J].Acta Oceanologica Sinica,2002,21(2):157-163. |
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| Authors: | Lan Jian and Wang Dongxiao |
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| Institution: | 1.Department of Oceanography, Ocean University of Qingdao, Oingdao 266003, China2.Laboratory for Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | A P - vector method is optimized using the variational data assimilation technique(VDAT). The absolute geostrophic velocity fields in the vicinity of the Luzon Strait (LS) are calculated, the spatial structures and seasonal variations of the absolute geostrophic velocity field are investigated. Our results show that the Kuroshio enters the South China Sea (SCS) in the south and middle of the Luzon Strait and flows out in the north, so the Kuroshio makes a slight clockwise curve in the Luzon Strait, and the curve is strong in winter and weak in summer. During the winter, a westward current appears in the surface, and locates at the west of the Luzon Strait. It is the north part of a cyclonic gyre which exits in the northeast of the SCS; an anti-cyclonic gyre occurs on the intermediate level, and it exits in the northeast of the SCS, and an eastward current exits in the southeast of the anti-cyclonic gyre. |
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| Keywords: | The South China Sea the Luzon Strait variational data assimilation technique |
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