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- W3100371500 endingPage "103450" @default.
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- W3100371500 abstract "This study reveals the influence of the Subtropical Mode Water (STMW) varieties and their spatiotemporal variability on the upper thermocline of the tropical Atlantic Ocean. Optimum Multiparameter water mass analysis was applied using the hydrographic and chemical datasets available from the World Ocean Database 2018 and The Global Ocean Ship-Based Hydrographic Investigations Program. Eighteen Degree Water (EDW) and Madeira Mode Water (MMW), sourced in the northwest and northeast North Atlantic, respectively, contribute to the North Atlantic Central Water (NACW) layer, which follows the North Equatorial Current and setting up the limit with the South Atlantic Central Water (SACW) at about 10°N. The contribution of the EDW to the NACW spreads at the surface layer (excluding the first 100 m) until the 26.6 kg m−3 isopycnal (~250 m). MMW contributes to denser levels of the upper layer, mainly between 26.8 and 27.0 kg m−3 (300–700 m). In the southern hemisphere, mode waters formed in the eastern South Atlantic (STMW18) and along the edge of the subtropical front (STMW12) were the main contributors to the surface and denser levels, respectively. The variety formed in the Brazil-Malvinas confluence (STMW14) was restricted to the southwestern side of the South Atlantic gyre, while the Subtropical Indian Mode Water (STIMW; mode water advected from the Indian Ocean into the South Atlantic Ocean) influenced the SACW structure between 20°S and 30°S with an averaged mixing fraction of ~34% ± 20%, mainly at isopycnals of 26.2 and 26.4 kg m−3 (100–400 m). The main source of the STIMW, the Agulhas eddies, act as interocean exchange structures that transport an average of 5.5 ± 3.2 Sv (1 Sv = 106 m3 s−1) of STIMW to the Atlantic, even after they have been altered by splitting and/or merging processes. In addition, a smaller contribution of ~20% of STIMW was associated with the North Brazil Current at ~350 m, showing the interhemispheric connection between the Indian Ocean and the upper branch of the Atlantic Meridional Overturning Circulation. Therefore, due to the previously reported increase of the Agulhas leakage and the dynamic of the southern Equatorial Current bifurcation, the heat and salt fluxes to the northern hemisphere may likely increase in the following years." @default.
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- W3100371500 date "2021-02-01" @default.
- W3100371500 modified "2023-10-09" @default.
- W3100371500 title "Source waters contribution to the tropical Atlantic central layer: New insights on the Indo-Atlantic exchanges" @default.
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- W3100371500 doi "https://doi.org/10.1016/j.dsr.2020.103450" @default.
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