Spreading of the South Pacific Tropical Water and Antarctic Intermediate Water Over the Maritime Continent
Spreading of the South Pacific Tropical Water and Antarctic Intermediate Water Over the Maritime Continent
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南太平洋热带水和南极中层水在海洋大陆上的扩散
DOI：
10.1029/2018jc013831
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发表时间：
2018
影响因子：
3.6
通讯作者：
Wei Zexun
中科院分区：
文献类型：
--
作者：
Yang Lina;Zhou Lei;Li Shujiang;Wei Zexun
利用涡解析模拟和被动示踪法研究了南太平洋水域在海洋大陆上的三维气候扩展。总结了南太平洋热带水和南极中间水通过海洋大陆的四条路径，包括两条直接路径，即东部路径和托雷斯海峡路径，以及两条间接路径，即西部路径和南海路径。其中，从示踪剂浓度分布来看，前两者对源自南太平洋的印尼通流（ITF）的体积输送贡献最大。后两者在进入印度尼西亚海之前经历了两次反射（即南赤道流—赤道潜流和北赤道逆流—北赤道流）。分析了南太平洋海水在印度尼西亚海各路径的垂直分布，发现南太平洋盐度极端事件对印度尼西亚海和ITF的中、深层以及上层温跃层有很大的影响。垂直通量，特别是垂直平流，对这些印度洋-太平洋水交换过程至关重要。对垂直扩散系数和初始条件进行了灵敏度试验，结果具有较好的鲁棒性。根据目前的研究，南太平洋对整个海洋大陆的水性质以及太平洋和印度洋之间的质能交换具有重大影响。
The three‐dimensional climatological spreading of South Pacific waters over the Maritime Continent is examined using eddy‐resolving simulations and a passive tracer method. Four pathways are summarized for the South Pacific Tropical Water and the Antarctic Intermediate Water through the Maritime Continent, including two direct pathways, namely, the Eastern Path and the Torres Strait Path, and two indirect pathways, namely, the Western Path and the South China Sea Path. Among them, according to tracer concentration distribution, the former two contribute most of the volume transport of the Indonesian Throughflow (ITF) originating from the South Pacific. The latter two experience two retroflections (i.e., the South Equatorial Current‐Equatorial Undercurrent and the North Equatorial Countercurrent‐North Equatorial Current) before entering the Indonesian Seas. The vertical distributions of the South Pacific waters along each path throughout the Indonesian Seas are also analyzed, revealing that the South Pacific salinity extrema greatly affect the intermediate and deep layers of the Indonesian Seas and ITF as well as the upper thermocline. Vertical fluxes, especially vertical advection, are vital to these Indo‐Pacific water exchange processes. Sensitivity tests are conducted for the vertical diffusion coefficient and initial conditions, the results of which are robust. According to current study, the South Pacific has substantial impacts on the water properties throughout the Maritime Continent and the mass‐energy exchanges between the Pacific and Indian Oceans.