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A high-resolution modeling study of the Western Iberian Margin mean and seasonal upper ocean circulation

机译：西伊比利亚边际均值和季节性上层海洋环流的高分辨率模拟研究

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摘要

The mean seasonal hydrography and circulation of the Western Iberian Margin (WIM) are studied by means of a high-resolution configuration of the Regional Oceanic Modeling System. A comparison of 5-year model averages for January and July with climatological datasets shows a general good agreement in the reproduction of the mean water mass properties and hydrographic distribution. We find that there is a prevailing tendency for slope poleward flow at about 80-100 km offshore at all latitudes from the surface to 1,500 m with strong vertical coupling. This northward flow, which is mainly along slope and amounts up to 8-10 cm s~(-1), exhibits several mean flow recirculation regions on its way and evidences of an offshore pathway of poleward flow. Transports at different zonal sections further confirm the poleward flow tendency with two peaks of poleward transport in summer (3-10 Sv) and winter (2-7 Sv). The transport time series emphasize the seasonal character of the alongshore circulation and the interannual intrinsic variability of the circulation, since the forcing fields are climatological. As a conceptual essay with the purpose of assessing the Mediterranean Water flow influence on the WIM mean circulation, a second model configuration is setup, where the Mediterranean outflow into the study domain is removed. We find that there is an attenuation of the mesoscale field, but the slope poleward flow intensifies and remains as a mean dynamical feature closer to the upper slope.
机译：伊比利亚西部边缘（WIM）的平均季节性水文学和环流是通过区域海洋建模系统的高分辨率配置研究的。将1月和7月的5年模型平均值与气候数据集进行比较，结果表明，在平均水质特性和水文分布的再现方面，总体上有很好的一致性。我们发现，在从地面到1,500 m的所有纬度，离海约80-100 km处，具有强垂直耦合的情况下，普遍存在斜坡斜向流的趋势。这种北向流动主要沿着斜坡，达8-10 cm s〜（-1），在其流动过程中表现出几个平均流动回流区域，并显示了极向流动的近海路径。在不同的地带剖面上的输运进一步证实了极向流的趋势，夏季（3-10 Sv）和冬季（2-7 Sv）有两个极向输送峰。运输时间序列强调了沿岸环流的季节特征和环流的年际内在变异性，因为强迫场是气候学的。作为旨在评估地中海水流量对WIM平均环流影响的概念性论文，建立了第二种模型配置，其中去除了流入研究领域的地中海水流。我们发现中尺度场存在衰减，但是坡向极流动加剧并保持为更接近上坡的平均动力学特征。

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  • 来源
    《Ocean Dynamics》 |2013年第10期|1041-1062|共22页
  • 作者

    Rita Nolasco; Ana Cordeiro Pires; Nuno Cordeiro; Bernard Le Cann; Jesus Dubert;

  • 作者单位

    Department of Physics, Campus de Santiago, Centre de Estudos do Ambiente e do Mar (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal;

    Department of Physics, Campus de Santiago, Centre de Estudos do Ambiente e do Mar (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal;

    Department of Physics, Campus de Santiago, Centre de Estudos do Ambiente e do Mar (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal;

    Laboratoire de Physique des Oceans, UMR 6523 CNRS/UBO/ IFREMER/IRD, Universite de Bretagne Occidentale, Brest, France;

    Department of Physics, Campus de Santiago, Centre de Estudos do Ambiente e do Mar (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Western Iberian Margin; Numerical modeling; Poleward flow; Upwelling systems;

    机译：伊比利亚西部边缘;数值建模;极流上升流系统;

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