The East Pacific Rise current: Topographic enhancement of the interior flow in the South Pacific Ocean
The East Pacific Rise current: Topographic enhancement of the interior flow in the South Pacific Ocean
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东太平洋海隆：南太平洋内流的地形增强
DOI：
10.1002/2016gl069039
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发表时间：
2017
影响因子：
5.2
通讯作者：
S. Gille
中科院分区：
文献类型：
--
作者：
N. Zilberman;D. Roemmich;S. Gille
基于ARGO浮标剖面和海洋内部轨迹的绝对速度观测表明，沿着东太平洋隆起的西侧存在赤道向流--东太平洋隆起流，它位于42°S到30°S之间。东太平洋上升流主要携带中间水团，包括亚南极模式水和南极中间水，以及从副热带环流南缘向赤道方向的更深水域。通过0-2600m深度范围外推的2004年至2014年平均东太平洋上升流输送为8.1±1.6Sverdrup(Sv)(1 Sv=106m~3 S−1)，与受东太平洋隆起地形影响的风驱动的内部输送相一致。虽然深海混合和地热加热都可以产生支持深海地转流的压力梯度，但这项研究表明，东太平洋隆起洋流输送的大约一半与东太平洋隆起上的深流地形转向有关。
Observations of absolute velocity based on Argo float profiles and trajectories in the ocean interior show evidence for an equatorward current, the East Pacific Rise current, between 42°S and 30°S, along the western flank of the East Pacific Rise. The East Pacific Rise current carries predominantly intermediate water masses, including Subantarctic Mode Water and Antarctic Intermediate Water, and deeper waters, from the southern edge of the subtropical gyre toward the Equator. The 2004 to 2014 mean East Pacific Rise current transport extrapolated through the 0–2600 m depth range is 8.1 ± 1.6 sverdrup (Sv) (1 Sv = 106 m3 s−1), consistent with a wind‐driven interior transport influenced by the East Pacific Rise topography. While deep ocean mixing and geothermal heating can both create pressure gradients that support geostrophic flows in the deep ocean, this study indicates that about half of the East Pacific Rise current transport is associated with topographic steering of the deep flow over the East Pacific Rise.