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首页> 外文期刊>Journal of Physical Oceanography >The Importance of Wind and Buoyancy Forcing for the Boundary Density Variations and the Geostrophic Component of the AMOC at 26 degrees N
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The Importance of Wind and Buoyancy Forcing for the Boundary Density Variations and the Geostrophic Component of the AMOC at 26 degrees N

机译：风和浮力强迫对26°N时AMOC的边界密度变化和地转成分的重要性

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摘要

It is widely thought that changes in both the surface buoyancy fluxes and wind stress drive variability in the Atlantic meridional overturning circulation (AMOC), but that they drive variability on different time scales. For example, wind forcing dominates short-term variability through its effects on Ekman currents and coastal upwelling, whereas buoyancy forcing is important for longer time scales (multiannual and decadal). However, the role of the wind forcing on multiannual to decadal time scales is less clear. Here the authors present an analysis of simulations with the Nucleus for European Modelling of the Ocean (NEMO) ocean model with the aim of explaining the important drivers of the zonal density gradient at 26 degrees N, which is directly related to the AMOC. In the experiments, only one of either the wind stress or the buoyancy forcing is allowed to vary in time, whereas the other remains at its seasonally varying climatology. On subannual time scales, variations in the density gradient, and in the AMOC minus Ekman, are driven largely by local wind-forced coastal upwelling at both the western and eastern boundaries. On decadal time scales, buoyancy forcing related to the North Atlantic Oscillation dominates variability in the AMOC. Interestingly, however, it is found that wind forcing also plays a role at longer time scales, primarily impacting the interannual variability through the excitation of Rossby waves in the central Atlantic, which propagate westward to interact with the western boundary, but also by modulating the decadal time-scale response to buoyancy forcing.
机译：人们普遍认为，表面浮力通量和风应力的变化都会驱动大西洋子午翻转环流（AMOC）的变化，但它们会在不同的时间尺度上驱动变化。例如，强迫风通过影响埃克曼洋流和沿海上升流而主导了短期变化，而浮力强迫对于较长的时间尺度（多年期和年代际）很重要。但是，风力在多年到十年的时间尺度上的作用尚不清楚。在这里，作者介绍了使用欧洲海洋模型核（NEMO）海洋模型进行的模拟分析，目的是解释26°N区域密度梯度的重要驱动因素，这与AMOC直接相关。在实验中，仅允许风应力或浮力强迫之一随时间变化，而另一种则保持其季节性变化的气候。在不到一年的时间尺度上，密度梯度的变化以及AMOC减去Ekman的变化主要是由西部和东部边界处的局部风力海岸上升引起的。在十年时间尺度上，与北大西洋涛动有关的浮力主导了AMOC的可变性。然而，有趣的是，发现风强迫在较长的时间尺度上也起着作用，主要是通过激发大西洋中部的罗斯比波激发年际变化，该波向西传播以与西边界相互作用，而且还通过调节浮力强迫的年代际尺度。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第9期|2387-2408|共22页
  • 作者

    Polo Irene; Robson Jon; Sutton Rowan; Balmaseda Magdalena Alonso;

  • 作者单位

    Univ Reading, Dept Meteorol, NCAS Climate, Reading RG6 6BB, Berks, England;

    Univ Reading, Dept Meteorol, NCAS Climate, Reading RG6 6BB, Berks, England;

    Univ Reading, Dept Meteorol, NCAS Climate, Reading RG6 6BB, Berks, England;

    European Ctr Medium Range Weather Forecasts, Reading, Berks, England;

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