| 南海浅层经向翻转环流及相关的内部水体流动 |
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| 引用本文： | 张宁宁,兰健,马杰,崔凤娟.南海浅层经向翻转环流及相关的内部水体流动[J].海洋学报(英文版),2016,35(7):1-7. |
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| 作者姓名： | 张宁宁 兰健 马杰 崔凤娟 |
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| 作者单位： | 物理海洋教育部重点实验室, 海洋与大气学院, 中国海洋大学, 青岛, 266100,物理海洋教育部重点实验室, 海洋与大气学院, 中国海洋大学, 青岛, 266100,物理海洋教育部重点实验室, 海洋与大气学院, 中国海洋大学, 青岛, 266100,国家海洋局北海信息中心, 青岛, 266061 |
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| 基金项目： | The Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11010302; the National Natural Science Foundation of China under contract Nos 41276011, 41521091 and U1406401; the Research Project of Ministry of Education of China under contract No. 113041A. |
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| 摘 要： | The structure of the annual-mean shallow meridional overturning circulation(SMOC) in the South China Sea(SCS) and the related water movement are investigated,using simple ocean data assimilation(SODA) outputs.The distinct clockwise SMOC is present above 400 m in the SCS on the climatologically annual-mean scale,which consists of downwelling in the northern SCS,a southward subsurface branch supplying upwelling at around 10°N and a northward surface flow,with a strength of about 1×10~6 m~3/s.The formation mechanisms of its branches are studied separately.The zonal component of the annual-mean wind stress is predominantly westward and causes northward Ekman transport above 50 m.The annual-mean Ekman transport across 18°N is about 1.2×10~6 m~3/s.An annual-mean subduction rate is calculated by estimating the net volume flux entering the thermocline from the mixed layer in a Lagrangian framework.An annual subduction rate of about 0.66×10~6m~3/s is obtained between 17° and 20°N,of which 87% is due to vertical pumping and 13% is due to lateral induction.The subduction rate implies that the subdution contributes significantly to the downwelling branch.The pathways of traced parcels released at the base of the February mixed layer show that after subduction water moves southward to as far as 11°N within the western boundary current before returning northward.The velocity field at the base of mixed layer and a meridional velocity section in winter also confirm that the southward flow in the subsurface layer is mainly by strong western boundary currents.Significant upwelling mainly occurs off the Vietnam coast in the southern SCS.An upper bound for the annual-mean net upwelling rate between 10° and 15°N is 0.7×10~6m~3/s,of which a large portion is contributed by summer upwelling,with both the alongshore component of the southwest wind and its offshore increase causing great upwelling.
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| 关 键 词： | 南海 浅层经向翻转环流 Ekman输运 潜沉 上升流 |
| 收稿时间： | 2015/5/20 0:00:00 |
| 修稿时间： | 2015/7/14 0:00:00 |
The shallow meridional overturning circulation in the South China Sea and the related internal water movement |
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| ZHANG Ningning,LAN Jian,MA Jie and CUI Fengjuan.The shallow meridional overturning circulation in the South China Sea and the related internal water movement[J].Acta Oceanologica Sinica,2016,35(7):1-7. |
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| Authors: | ZHANG Ningning LAN Jian MA Jie and CUI Fengjuan |
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| Institution: | 1.Physical Oceanography Laboratory, College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China2.North China Sea Data and Information Service, North China Sea Branch, State Oceanic Administration, Qingdao 266061, China |
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| Abstract: | The structure of the annual-mean shallow meridional overturning circulation (SMOC) in the South China Sea (SCS) and the related water movement are investigated, using simple ocean data assimilation (SODA) outputs. The distinct clockwise SMOC is present above 400 m in the SCS on the climatologically annual-mean scale, which consists of downwelling in the northern SCS, a southward subsurface branch supplying upwelling at around 10°N and a northward surface flow, with a strength of about 1×106 m3/s. The formation mechanisms of its branches are studied separately. The zonal component of the annual-mean wind stress is predominantly westward and causes northward Ekman transport above 50 m. The annual-mean Ekman transport across 18°N is about 1.2×106 m3/s. An annual-mean subduction rate is calculated by estimating the net volume flux entering the thermocline from the mixed layer in a Lagrangian framework. An annual subduction rate of about 0.66×106 m3/s is obtained between 17° and 20°N, of which 87% is due to vertical pumping and 13% is due to lateral induction. The subduction rate implies that the subdution contributes significantly to the downwelling branch. The pathways of traced parcels released at the base of the February mixed layer show that after subduction water moves southward to as far as 11°N within the western boundary current before returning northward. The velocity field at the base of mixed layer and a meridional velocity section in winter also confirm that the southward flow in the subsurface layer is mainly by strong western boundary currents. Significant upwelling mainly occurs off the Vietnam coast in the southern SCS. An upper bound for the annual-mean net upwelling rate between 10° and 15°N is 0.7×106 m3/s, of which a large portion is contributed by summer upwelling, with both the alongshore component of the southwest wind and its offshore increase causing great upwelling. |
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| Keywords: | South China Sea shallow meridional overturning circulation Ekman transport subduction upwelling |
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