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Barotropic Rossby Waves Radiating from Tropical Instability Waves in the Pacific Ocean

机译：太平洋热带不稳定波辐射的正压罗斯比波

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摘要

Tropical instability waves are triggered by instabilities of the equatorial current systems, and their sea level signal, with peak amplitude near 5°N, is one of the most prominent features of the dynamic topography of the tropics. Cross-spectral analysis of satellite altimetry observations shows that there is sea level variability in the Pacific Ocean as far north as Hawaii (i.e., 20°N) that is coherent with the sea level variability near 5°N associated with tropical instability waves. Within the uncertainty of the analysis, this off-equatorial variability obeys the dispersion relation for nondivergent, barotropic Rossby waves over a fairly broad range of periods (26-38 days) and zonal wavelengths (9°-23° of longitude) that are associated with tropical instability waves. The dispersion relation and observed wave properties further suggest that the waves are carrying energy away from the instabilities toward the North Pacific subtropical gyre, which, together with the observed coherence of the sea level signal of the barotropic waves with that of the tropical instability waves, suggests that the barotropic Rossby waves are being radiated from the tropical instability waves. The poleward transport of kinetic energy and westward momentum by these barotropic Rossby waves may influence the circulation in the subtropics.
机译：热带不稳定波是由赤道洋流系统的不稳定触发的，其海平面信号的峰值幅度在5°N附近，是热带动态地形的最突出特征之一。卫星测高观测值的跨谱分析表明，太平洋到北至夏威夷（即20°N）存在海平面变化，这与与热带不稳定波有关的5°N附近的海平面变化一致。在分析的不确定性范围内，这种赤道外的变异性在相当大的周期范围（26-38天）和纬向波长（经度9°-23°）内服从非发散的正压罗斯比波的色散关系热带不稳定波。色散关系和观测到的波特性进一步表明，波将能量从不稳定性中带出，流向北太平洋亚热带回旋，再加上正压波与热带不稳定性波的海平面信号的观测相干性，表明正压Rossby波正在从热带不稳定波中辐射出来。这些正压罗斯贝波向动能和向西动量的极极输送可能会影响亚热带的环流。

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  • 来源
    《Journal of Physical Oceanography》 |2011年第6期|p.1160-1181|共22页
  • 作者

    J. Thomas Farrar;

  • 作者单位

    Woods Hole Oceanographic Institution, Mail Stop 29, Woods Hole, MA 02543;

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