| YAO Wenjun,SHI Jiuxin. 2017. Pacific-Indian interocean circulation of the Antarctic Intermediate Water around South Australia. Acta Oceanologica Sinica, 36(7):4－14 |
| Pacific-Indian interocean circulation of the Antarctic Intermediate Water around South Australia |
| 环南澳大利亚太平洋-印度洋海洋间南极中层水环流 |
| Received:December 31, 2016 Revised:February 08, 2017 |
| DOI：10.1007/s13131-017-1078-z |
| Key words:Antarctic Intermediate Water Pacific-Indian interocean circulation South Australia World Ocean Circulation Experiment Argo |
| 中文关键词: 南极中层水 太平洋-印度洋大洋间环流 南澳大利亚 世界大洋环流实验 地转海洋学实时观测阵 |
| 基金项目:The Chinese Polar Environment Comprehensive Investigation and Assessment Programs under contract Nos CHINARE-04-04 and CHINARE-04-01. |
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| Abstract: |
| On the basis of the salinity distribution of isopycnal (σ0=27.2 kg/m3) surface and in salinity minimum, the Antarctic Intermediate Water (AAIW) around South Australia can be classified into five types corresponding to five regions by using in situ CTD observations. Type 1 is the Tasman AAIW, which has consistent hydrographic properties in the South Coral Sea and the North Tasman Sea. Type 2 is the Southern Ocean (SO) AAIW, parallel to and extending from the Subantarctic Front with the freshest and coldest AAIW in the study area. Type 3 is a transition between Type 1 and Type 2. The AAIW transforms from fresh to saline with the latitude declining (equatorward). Type 4, the South Australia AAIW, has relatively uniform AAIW properties due to the semi-enclosed South Australia Basin. Type 5, the Southeast Indian AAIW, progressively becomes more saline through mixing with the subtropical Indian intermediate water from south to north. In addition to the above hydrographic analysis of AAIW, the newest trajectories of Argo (Array for real-time Geostrophic Oceanography) floats were used to constructed the intermediate (1 000 m water depth) current field, which show the major interocean circulation of AAIW in the study area. Finally, a refined schematic of intermediate circulation shows that several currents get together to complete the connection between the Pacific Ocean and the Indian Ocean. They include the South Equatorial Current and the East Australia Current in the Southwest Pacific Ocean, the Tasman Leakage and the Flinders Current in the South Australia Basin, and the extension of Flinders Current in the southeast Indian Ocean. |
| 中文摘要: |
依据沿σ0=27.2 kg/m3等密度面以及盐度最小值上的水文性质分布，太平洋-印度洋之间的南极中层水（AAIW，Antarctic Intermediate Water），在环绕南澳大利亚的海域范围内可以被划分为5种类型，且这5种类型对应了5个分区。类型1是塔斯曼南极中层水，在南珊瑚海及北塔斯曼海上具有一致的水文性质。类型2是南大洋南极中层水，其分布平行于亚南极锋，并且由亚南极锋往北延伸，具有在研究区域内最淡最冷的水体性质。类型3是类型1跟类型2之间的过渡，南极中层水盐度随着纬度的减小（赤道向）不断增加。类型4是南澳大利亚南极中层水，由于南澳大利亚海盆半封闭的地形分布，这里的南极中层水水体性质具有相对一致性。类型5是东南印度洋南极中层水，从南到北，水体在与亚热带印度洋水体不断混合的过程中盐度持续增加。
在分析了由地转海洋学实时观测阵浮标轨迹构建的1 000 m深度流速场后，南极中层水在太平洋-印度洋间的主要环流如下：1）西南太平洋。向南流动的东澳大利亚流，在28°S纬度进入南珊瑚海的西向流，塔斯曼海上的双涡旋系统以及在南塔斯曼海的延伸式回流。这些历史上由水文观测得到的流动，在新数据中得到了进一步证实。另外，当前的工作发现东澳大利亚流在35-36°S纬度带有所减弱，并且双涡旋系统相对于历史观测位于更往南的位置。2）在南澳大利亚海盆，环流的概览图展示了向西流动的南极中层水在海盆中部分成了3个分支。3）在东南印度洋上，由CTD观测得到的向东进入珀斯海盆并沿着海盆东边界出流的流动，得到了证实。
最后，中层环流结构图展示了在西南太平洋上的南赤道流与东澳大利亚流，南澳大利亚海盆上的塔斯曼泄漏与弗林德斯流，东南印度洋上的弗林德斯流延伸体，这些流动结合在一起共同完成了在环南澳大利亚太平洋-印度洋之间的南极中层水水交换。 |
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