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首页> 外文期刊>Journal of Physical Oceanography >Interannual Bottom Pressure Signals in the Australian-Antarctic and Bellingshausen Basins
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Interannual Bottom Pressure Signals in the Australian-Antarctic and Bellingshausen Basins

机译：澳大利亚-南极和贝林斯豪森盆地的年际底部压力信号

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摘要

Analyses of large-scale (>750 km) ocean bottom pressure p_b, fields, derived from the Gravity Recovery and Climate Experiment (GRACE) and from an Estimating the Circulation & Climate of the Ocean (ECCO) state estimate, reveal enhanced interannual variability, partially connected to the Antarctic Oscillation, in regions of the Australian-Antarctic Basin and the Bellingshausen Basin, with p_b, magnitudes comparable to those of sea level and good correlation between the GRACE and ECCO p_b series. Consistent with the theory of Gill and Niiler, the patterns of stronger p_b, variability are partly related to enhanced local wind curl forcing and weakened gradients in H/f, where H is ocean depth and f is the Coriolis parameter. Despite weaker H/f gradients, motions against them are sufficiently strong to play a role in balancing the local wind input. Topographic effects are as or more important than changes in f. Additionally, and contrary to the dominance of barotropie processes at subannual time scales, baroclinic effects are not negligible when balancing wind input at periods of a few years. Results highlight the emerging capability to accurately observe and estimate interannual changes in large-scale p_b, over the Southern Ocean, with implications for the interpretation of low-frequency variability in sea level in terms of steric height and heat content.
机译：重力恢复和气候实验（GRACE）和估算海洋环流和气候（ECCO）状态估算得出的大规模（> 750 km）海底压力p_b场分析表明，年际变化性增强，在澳大利亚-南极盆地和贝林斯豪森盆地的区域中，部分与南极涛动有关，p_b的大小与海平面相当，并且GRACE和ECCO p_b系列之间具有良好的相关性。与吉尔和尼尔（Gill and Niiler）的理论一致，较强的p_b模式，变异性与局部风卷曲强迫的增强和H / f梯度的减弱有关，其中H是海洋深度，f是科里奥利参数。尽管H / f梯度较弱，但针对它们的运动仍然足够强大，可以在平衡局部风输入中发挥作用。地形影响与f的变化同等重要。另外，与在每年一次的时间尺度上正压过程的优势相反，当平衡几年的风输入时，斜压效应不可忽略。结果突出显示了在南大洋上准确观测和估计大尺度p_b的年际变化的新兴能力，这对解释空间高度和热量含量方面的海平面低频变化具有重要意义。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第5期|1456-1465|共10页
  • 作者

    RUI M. PONTE; CHRISTOPHER G. PIECUCH;

  • 作者单位

    Atmospheric and Environmental Research, Inc., 131 Hartwell Avenue, Lexington, MA 02421;

    Atmospheric and Environmental Research, Inc., Lexington, Massachusetts;

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