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首页> 外文期刊>Journal of oceanography >Chemical signature of intermediate water masses along western Portuguese margin
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Chemical signature of intermediate water masses along western Portuguese margin

机译：葡萄牙西部边缘中等水团的化学特征

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Although the circulation of intermediate water masses in the eastern North Atlantic remains poorly defined, the presence of fresher intermediate waters, the Sub-Artic (SAIW) and the Antarctic Intermediate Water (AAIW), as well the saline intermediate Mediterranean Water (MW), has been tracked using biogeochemical properties. Here we assess the hydrographic and chemical structures of intermediate waters along the western Portuguese margin by examining the vertical distributions and property-property plots of chemical tracers (oxygen and nutrients). AAIW was traced by low oxygen and high nutrients, while SAIW was recognized by low nutrients. The Mediterranean Water (MW) undercurrent is shown to spread towards the eastern flank of Gorringe bank. Concurrently, the fresher waters gained salt by direct incorporation of MW, while this water was enriched in nutrients on its way northward and westward owing, to a great extent, to the entrainment of an AAIW branch. The distributions of nutrients and apparent oxygen utilization are discussed in terms of regional ocean circulation. Our analysis suggests a circulation pattern of the various intermediate waters along the western Portuguese margin: MW extends all over the area, but its presence is more pronounced around cape St. Vincent; SAIW apparently moves southward, reaching the Gorringe bank region, and AAIW flows northward along the coast and around the bank.
机译：尽管北大西洋东部的中间水团的环流仍然难以确定，但是存在较新鲜的中间水，亚硫酸盐（SAIW）和南极中间水（AAIW）以及盐水中间的地中海水（MW），已经使用生物地球化学特性进行了追踪。在这里，我们通过检查化学示踪剂（氧气和养分）的垂直分布和特性图来评估西葡萄牙边缘的中间水域的水文和化学结构。低氧和高养分可以追溯到AAIW，而低营养素可以追溯到SAIW。显示地中海水（MW）的暗流向Gorringe河岸的东侧扩散。同时，较新的水通过直接掺入MW获得了盐分，而在很大程度上，这是由于AAIW支流的夹带使该水向北和向西富集了营养。从区域海洋环流的角度讨论了养分的分布和表观氧气的利用。我们的分析表明，葡萄牙西部边缘各种中间水域的循环模式：MW遍布整个区域，但在圣文森特角附近更为明显。 SAIW显然向南移动，到达Gorringe岸地区，而AAIW则沿海岸和该岸向北流动。

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