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首页> 外文期刊>Journal of Physical Oceanography >Interpreting Energy and Tracer Spectra of Upper-Ocean Turbulence in the Submesoscale Range (1-200 km)
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Interpreting Energy and Tracer Spectra of Upper-Ocean Turbulence in the Submesoscale Range (1-200 km)

机译：解释中亚尺度范围内（1-200 km）上洋湍流的能量和示踪谱

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摘要

Submesoscale (1-200 km) wavenumber spectra of kinetic and potential energy and tracer variance are obtained from in situ observations in the Gulf Stream region and in the eastern subtropical North Pacific. In the Gulf Stream region, steep kinetic energy spectra at scales between 200 and 20 km are consistent with predictions of interior quasigeostrophic-turbulence theory, both in the mixed layer and in the thermocline. At scales below 20 km, the spectra flatten out, consistent with a growing contribution of internal-wave energy at small scales. In the subtropical North Pacific, the energy spectra are flatter and inconsistent with predictions of interior quasigeostrophic-turbulence theory. The observed spectra and their dependence on depth are also inconsistent with predictions of surface quasigeostrophic-turbulence theory for the observed ocean stratification. It appears that unbalanced motions, most likely internal tides at large scales and the internal-wave continuum at small scales, dominate the energy spectrum throughout the submesoscale range. Spectra of temperature variance along density surfaces, which are not affected by internal tides, are also inconsistent with predictions of geostrophic-turbulence theories. Reasons for this inconsistency could be the injection of energy in the submesoscale range by small-scale baroclinic instabilities or modifications of the spectra by coupling between surface and interior dynamics or by ageostrophic frontal effects.
机译：从海湾流地区和东亚热带北太平洋的原位观测获得动能和势能的亚中尺度（1-200 km）波数谱和示踪剂方差。在墨西哥湾流地区，在混合层和温跃层中，陡峭的动能谱在200至20 km的尺度上与内部准地转湍流理论的预测一致。在20 km以下的尺度上，频谱趋于平坦，这与小范围内的内波能量的贡献不断增加相一致。在亚热带北太平洋，能谱更加平坦，与内部准地转湍流理论的预测不一致。观测到的光谱及其对深度的依赖性也与观测到的海洋分层的表面准地转湍流理论的预测不一致。看来，不平衡运动，最可能是大尺度的内潮和小尺度的内波连续体，主导了整个亚中尺度范围内的能谱。不受内潮影响的沿密度表面的温度变化谱也与地转湍流理论的预测不一致。这种不一致的原因可能是由于小规模斜压不稳定性或通过表面与内部动力学之间的耦合或年龄变迁的额叶效应对光谱的修改而在亚中尺度范围内注入了能量。

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  • 来源
    《Journal of Physical Oceanography》 |2013年第11期|2456-2474|共19页
  • 作者

    JOERN CALLIES; Raffaele Ferrari;

  • 作者单位

    MITAVHOI Joint Program in Oceanography, Cambridge/Woods Hole, Massachusetts,Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139;

    Massachusetts Institute of Technology, Cambridge, Massachusetts;

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