Canary Current and North Equatorial Current from an inverse box model
Canary Current and North Equatorial Current from an inverse box model
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逆盒模型中的加那利洋流和北赤道洋流
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
P. Vélez‐Belchí
中科院分区：
文献类型：
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作者：
A. Hernández‐Guerra;E. Fraile‐Nuez;F. López;A. Martínez;G. Parrilla;P. Vélez‐Belchí
[1]大规模的加那利盆地环流估计从箱逆模型应用于水文数据从2003年9月进行的准天气调查。这次航行包括76个全深度CTD和氧气站。需要环流来几乎保持中性表面所包围的层内的盐度和热量的质量和异常。它允许平流和扩散层之间的交换和调整的埃克曼运输和淡水通量的分歧。在温跃层的加那利海流从非洲海岸向加那利群岛以北南至19°W输送净质量4.7 ± 0.8 Sv。在非洲海岸和兰萨罗特岛之间，它被分为一个向北的环流，速度为1.1 ± 0.5 Sv，以及一个向南的输送，速度为5.8 ± 0.6 Sv。它输送北大西洋中部的水和有机物，这些水和有机物通过从非洲西北部海域的上升流系统伸出的细丝平流输送到近海。在24°N，加那利海流为北赤道海流提供补给，北赤道海流将北大西洋和南大西洋中部沃茨的混合物向西输送。在中间层，1.2 ± 1.1Sv的西南气流将地中海水输送到副热带环流，但最大的盐通量是由一个涡旋输送的。氧的分布和物质输送表明，温度低于2.2°C的水团存在一个向东北方向的深层流动，由稀释的南极底层水组成。断面与非洲海岸之间的热量和淡水辐散以及平均纬向速度和扩散可以忽略不计。
[1] The large-scale Canary Basin circulation is estimated from a box inverse model applied to hydrographic data from a quasi-synoptic survey carried out in September 2003. The cruise consisted of 76 full depth CTD and oxygen stations. Circulation is required to nearly conserve mass and anomalies of salinity and heat within layers bounded by neutral surfaces. It permits advective and diffusive exchange between layers and an adjustment of the Ekman transport and the freshwater flux divergences. The Canary Current at the thermocline layer transports a net mass of 4.7 ± 0.8 Sv southward north of the Canary Islands from the African coast to 19°W. It is divided into a northward circulation at a rate of 1.1 ± 0.5 Sv between the African coast and Lanzarote Island and a southward transport of 5.8 ± 0.6 Sv. It transports North Atlantic Central Water and organic matters advected offshore by the filaments protruding from the upwelling system off northwest Africa. At 24°N, the Canary Current feeds the North Equatorial Current that transports a mixture of North and South Atlantic Central Waters westward. In the intermediate layer a southwestward flow of 1.2 ± 1.1 Sv transports Mediterranean Water to the Subtropical Gyre, though the highest salt flux is transported by a meddy. Oxygen distribution and mass transport suggest a northeastward deep flow of a water mass colder than 2.2°C consisting of diluted Antarctic Bottom Water. The heat and freshwater divergences and the average dianeutral velocity and diffusion between the sections and the African coast are negligible.