Origins and Pathways of the Pacific Equatorial Undercurrent Identified by a Simulated Adjoint Tracer
Origins and Pathways of the Pacific Equatorial Undercurrent Identified by a Simulated Adjoint Tracer
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模拟伴随示踪剂识别太平洋赤道暗流的起源和路径
DOI：
10.1029/2018jc014212
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发表时间：
2019-04
影响因子：
3.6
通讯作者：
Qu Tangdong
中科院分区：
文献类型：
--
作者：
Nie Xunwei;Gao Shan;Wang Fan;Chi Jianwei;Qu Tangdong
本文利用海洋环流和气候估算联合会的模拟伴随示踪剂研究了太平洋赤道潜流（EUC）的起源和路径。EUC的主要来源沃茨，以及他们的过境时间和贡献，确定。EUC水成分的纬向变化和不同途径的贡献也进行了估计。结果表明，赤道上赤道外赤道水与热带水的比例沿着比较稳定（1：4），但西太平洋以热带外赤道水为主。EUC内的热带外水主要通过西部边界通道输送，而通过内部通道输送的百分比向东逐渐增加。热带水主要通过热带单体与赤道的北方一侧汇合进入EUC。
赤道潜流（EUC）对赤道太平洋热力结构和海盆东部表层温度起着重要的调节作用。因此，它在厄尔尼诺南方涛动事件的演变中至关重要。研究EUC源沃茨有助于了解该海流的变化及其对赤道太平洋的影响。以往的研究表明，各种EUC源沃茨在太平洋海盆分布广泛。而这些沃茨进入赤道区的主要通道有两条：西边界通道和内部通道。本文对这一问题进行了定量分析。我们不仅确定了过境时间和这些源沃茨的贡献，但也纬向变化的EUC的组成和不同途径的贡献。结果表明，赤道附近EUC水来自热带和热带外的水之比沿着基本保持稳定（1比4），但西太平洋以热带外的水为主。外海沃茨主要通过西部边界通道输送。从内部通道的贡献逐渐增加向东。
The origins and pathways of the Pacific Equatorial Undercurrent (EUC) are investigated using a simulated adjoint tracer of the consortium Estimating the Circulation and Climate of the Ocean. The main source waters of the EUC, as well as their transit time and contributions, are identified. The zonal variability of the EUC water composition and the contributions from different pathways are also estimated. Results show that the ratio of the EUC water coming from the tropics to that from extratropics is relatively stable (1 vs. 4) along the equator, except in the western Pacific where extratropical water is more dominant. The main body of extratropical water within the EUC is transported through the western boundary pathways, while the percent transported via the interior pathways gradually increases toward the east. Tropical water merges into the EUC mainly through the tropical cells with a larger portion through the northern side of the equator.
Plain Language Summary The Equatorial Undercurrent (EUC) plays an important role in modulating the equatorial Pacific thermal structure and the surface temperature in the eastern basin. Thus, it is crucial in evolution of the El Nino Southern Oscillation events. Studying the EUC source waters helps us understanding the variability of this current and hence its influence to equatorial Pacific. Previous studies revealed that the various EUC source waters distribute widely in the Pacific basin. And there are two main pathways for these waters entering the equatorial region: the western boundary pathway and the interior pathway. This work analyzed this issue more quantitatively. We identified not only the transit time and contributions of these source waters but also the zonal variability of the EUC's composition and the contributions from different pathways. Results show that the ratio of the EUC water coming from tropics to that from extratropics is stable (1 vs. 4) along the equator, except in the western Pacific where extratropical water is more dominant. The extratropical waters are mainly transported through the western boundary pathways. The contribution from the interior pathways gradually increases toward the east.
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