Antarctic Intermediate Water circulation in the tropical and subtropical South Atlantic
Antarctic Intermediate Water circulation in the tropical and subtropical South Atlantic
复制标题
南极中层水环流在热带和亚热带南大西洋
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
L. Talley
中科院分区：
文献类型：
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作者：
T. Suga;L. Talley
最近从南大西洋通风实验巡航和其他水文数据与历史数据相结合，并用于映射对应于在大西洋的南极中层水（AAIW）的等密度特性。AAIW的低盐度向东延伸穿过赤道以南的南大西洋（3-4°S）。在赤道以北（北纬1-2°）有一股微弱的东风。在2°S和2°N之间的赤道上发现AAIW中的横向和垂直均匀化属性;仅沿沿着没有明显的盐度纬向梯度。这些观测结果表明赤道斜压形变半径内的混合增强。南大西洋热带环流由以下三个环流圈组成：一个中心位于7°S附近的气旋环流圈，另一个中心位于19°S和23°S附近的环流圈，以及一个中心位于13°S的反气旋环流圈。这些环流与起源于热带南大西洋东部的高盐度和低氧的10°S处的向西延伸以及西部约15°S和东部约20°S处的这些特性中的锋面有关。
Recent hydrographic data from the South Atlantic Ventilation Experiment cruises and others are combined with historical data and used to map the isopycnal properties corresponding to the Antarctic Intermediate Water (AAIW) in the Atlantic Ocean. The low salinity of the AAIW extends eastward across the South Atlantic just south of the equator (3–4°S). Evidence of a weak eastward flow just north of the equator (1–2°N) is also shown. Lateral and vertical homogenization of properties in the AAIW is found at the equator between 2°S and 2°N; there is no clear zonal gradient in salinity just along the equator. These observations suggest enhanced mixing within the equatorial baroclinic deformation radius. The South Atlantic tropical gyre is shown to consist of the following three cells: one cyclonic cell centered at about 7°S, another centered at about 19°S in the west and 23°S in the east, and one anticyclonic cell centered at about 13°S. These cells are associated with a westward extension at 10°S of high salinity and low oxygen which originates in the eastern tropical South Atlantic and a front in these properties at about 15°S in the west and about 20°S in the east.