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Variability of the Canary Current Diagnosed by Inverse Box Models

机译:逆框模型诊断的金丝雀电流的可变性

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Four hydrographic cruises carried out between ~26.5 and 31°N in the eastern North Atlantic Subtropical Gyre in fall (2016 and 2017) and spring (2017 and 2018) are used to identify water masses and infer oceanic circulation. Geostrophic velocities are initially adjusted by referencing them to data from a Lower Acoustic Doppler Current Profiler (LADCP) and later to velocities estimated with an inverse box model. The distribution of the intermediate water masses (700 to 1,400 m depth) varies seasonally. Antarctic Intermediate Water (AAIW) comprises the largest contributor to the seasonal cycle in the intermediate water masses. Circulation of the Canary Current (CC) differs in fall and spring. In fall, the CC flows southward through the western islands and recirculates south of the archipelago, subsequently flowing northward through the passage between the eastern islands and Africa. North of Lanzarote, the recirculated CC intensified as it is joined by a southeasterly branch of the CC north of Lanzarote. In spring, the net transport of the CC is southward. High interannual variability in mass transport is evident in both spring and fall as a result of the position of the current, with its easternmost (westernmost) position found in spring (fall) 2018 (2016). At intermediate levels, highly variable northward/southward transport is apparent in fall over the African slope, with the Intermediate Poleward Under Current (IPUC) only present in 2017.
机译:在秋季(2016年和2017年)和春天(2016年和2017年)和春季(2017年和2018年)和春季(2017年和2018年)之间进行的四个水文巡航,用于识别水群和推断海洋循环。最初通过将它们从下声学多普勒电流分析器(LADCP)的数据引用到数据来调整热性速度,以后估计逆框模型。中间水质量的分布(700至1,400米深度)季节性变化。南极中间水(AAIW)包括中间水质量中季节性循环的最大贡献者。金丝雀电流(CC)的循环在秋季和弹簧中不同。在秋天,CC通过西部岛屿向南流动并在群岛南部循环,随后通过东部岛屿和非洲之间的通道向北流动。兰萨罗特北部,再循环的CC加剧,因为它是由兰萨罗特北部CC的东南部分支加入。在春天,CC的净运输是向南的。由于目前的位置,在春季和秋季的位置,春天的终际变异性很大,因此在春天(秋季)2018(2016年)(2016年)中发现的东部(最根本)的位置。在中间水平上,在非洲坡度下降,高度变化的向北/向南运输是显而易见的,在2017年的当前(ipuc)下的中间杆子下方。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2084-2084|共1页
  • 作者单位

    Unidad Oceano y Clima Instituto de Oceanografa y Cambio Global CSIC Universidad de Las Palmas de Gran Canaria Las Palmas de Gran Canaria Spain;

    Unidad Oceano y Clima Instituto de Oceanografa y Cambio Global CSIC Universidad de Las Palmas de Gran Canaria Las Palmas de Gran Canaria Spain;

    Unidad Oceano y Clima Instituto de Oceanografa y Cambio Global CSIC Universidad de Las Palmas de Gran Canaria Las Palmas de Gran Canaria Spain;

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