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首页> 外文期刊>ICES Journal of Marine Science >Spring-summer climatological circulation in the upper layer in the region of Cape St. Vincent, Southwest Portugal
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Spring-summer climatological circulation in the upper layer in the region of Cape St. Vincent, Southwest Portugal

机译：葡萄牙西南部圣文森特角地区上层的春夏季气候环流

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Geostrophic transport and hydrographic measurements derived from a historical database (1900-1998) were used to study the spring-summer mean circulation in the upper layer south and west of Cape St. Vincent, Southwest (SW) Portugal. The larger-scale circulation scheme is forced by equatorward winds from May to September, when the Iberian coastal transition zone (CTZ) is dominated by a generalized upwelling of cold, low-salinity water. A partially separated surface jet intensified at the shelf break conveys ～ 1 Sv of upwelled water equatorward parallel to the bathymetry, while offshore a poleward flow transports ～ 0.4-0.6 Sv of upwelled water. Although alongshore transports dominate the circulation pattern of the upper layers, cross-shore transports are significant at the climatological scale. Anticyclonic circulation with an exchange of ～ 0.5 Sv from the equatorward jet to the offshore poleward flow and the partial re-circulation further north, back into the equatorward flow are discussed. A coherent, cyclonic re-circulation pattern inshore of the upwelling jet is also speculated. From these results the shelf break is considered a climatological border at both sides of which two major re-circulation cells occur. The climatological equatorward flow has offshore protrusions, interpreted as recurrent episodes of major contortions of the upwelling flow. These features bring about considerable "cross-shelf flow" re-circulation reaching up to 50% of the main flow. The most significant exchanges are found to be associated with major changes of orientation of the coastline. Off Cape St. Vincent the upwelling front stretches to both west and south and contributes to the cross-shelf re-circulations. Additionally, convergence of the upwelling flow and a branch of the Azores current, with associated re-circulation is found diagonally from the cape. On the southern coast the upwelling jet is seen to meander offshore in the vicinity of Cape St. Maria. Individual synoptic cruise data showed agreement with the climatological circulation features. We conclude that these oceanographic features leave an imprint on the climatic circulation in spite of the "smoothing out" of recurrent events over the spring-summer period of the years of 1900-998.
机译：从历史数据库（1900-1998年）获得的地转运动和水文测量数据被用于研究葡萄牙西南部圣文森特角南和西上层的春夏季平均环流。 5月至9月，赤道风推动了较大规模的循环方案，当时伊比利亚沿海过渡带（CTZ）普遍受到寒冷，低盐度水的上涌作用。在陆架折断处增强的部分分离的表面射流平行于测深仪向赤道方向输送约1 Sv的上升流水，而近海的极向流则输送约0.4-0.6 Sv的上升流的水。尽管沿海运输在上层的环流模式中占主导地位，但跨海岸运输在气候尺度上却很重要。讨论了从赤道向射流到近海极向流交换〜0.5 Sv的反气旋环流，以及向北再返回赤道流的部分再循环。还推测了上升流射流沿岸的连贯的气旋再循环模式。从这些结果来看，货架破裂被认为是气候的边界，在该边界的两侧出现了两个主要的再循环细胞。气候赤道流具有离岸凸起，被解释为上升流主要变形的反复发作。这些功能带来了可观的“跨架流”再循环，可达到主流流量的50％。发现最重要的交换与海岸线方向的重大变化有关。在圣文森特角（Cape St. Vincent）附近，上升流线一直延伸到西部和南部，并促进了交叉架的再循环。此外，从海角对角发现上升流和亚速尔群岛支流的汇合以及相关的再循环。在南部海岸，可以看到上升的喷流在圣玛丽亚角附近蜿蜒在海上。个别天气巡游数据显示与气候环流特征一致。我们得出的结论是，尽管在1900-998年春夏季期间反复出现的事件得以“消除”，但这些海洋特征仍在气候循环中留下了印记。

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