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首页> 外文期刊>Journal of Physical Oceanography >Upgradient and Downgradient Potential Vorticity Fluxes Produced by Forced Rossby Waves. Part I: Basic Experiments
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Upgradient and Downgradient Potential Vorticity Fluxes Produced by Forced Rossby Waves. Part I: Basic Experiments

机译：强迫Rossby波产生的向上和向下的潜在涡度通量。第一部分：基础实验

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摘要

The mean flow and potential vorticity (PV) flux produced by Rossby waves are examined, particularly by focusing on the effects of stratification and nonlinearity on upgradient and downgradient PV fluxes. Rossby waves are excited by an external forcing confined near the surface and produce a northward (upgradient) PV flux in the surface layer. While the meridional PV flux is considerably weak in the deep layer in the weakly nonlinear case, the southward (downgradient) PV flux is produced as nonlinearity increases. In both the surface and deep layers, the distribution of the PV flux and mean flow is qualitatively similar to that in recirculation gyres obtained in an eddy-resolving model of the wind-driven circulation. A perturbation analysis shows that the primary and harmonic waves are excited by external forcing and wave-wave interaction between the primary waves, respectively. The meridional PV fluxes in the surface and deep layers are mostly produced by the primary and harmonic waves, respectively. The southward PV flux in the deep layer is produced by the interaction between the barotropic harmonic wave and the first baroclinic component of nonlinear forcing by the primary waves. The irreversible processes that are implicitly assumed in the PV homogenization theory (Rhines and Young) do not substantially affect the southward PV flux. The qualitative features of the PV flux remain unchanged even when nonlinearity is increased beyond the range in which the perturbation theory is exactly applicable.
机译：检查了Rossby波产生的平均流量和潜在涡度（PV）通量，特别是关注了分层和非线性对上，下梯度PV通量的影响。罗斯比波受到局限在地表附近的外力激励，并在表层产生向北（向上）的PV通量。在弱非线性情况下，深层的子午PV通量相当弱，但随着非线性的增加，会产生向南（下降）的PV通量。在表面层和深层中，PV通量和平均流量的分布在质量上都类似于在风循环的涡旋解析模型中获得的循环回旋中的分布。扰动分析表明，一次波和谐波分别由外力和一次波之间的波波相互作用所激发。表面层和深层的子午PV通量分别主要由一次波和谐波产生。深层中向南的PV通量是由正压谐波与一次波非线性强迫的第一斜压分量之间的相互作用产生的。 PV均质化理论中隐含的不可逆过程（Rhines和Young）基本上不会影响向南的PV通量。即使非线性增加超出了微扰理论可精确应用的范围，PV通量的定性特征也保持不变。

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    《Journal of Physical Oceanography》 |2018年第5期|1191-1209|共19页
  • 作者

    Mizuta Genta;

  • 作者单位

    Hokkaido Univ, Grad Sch Environm Earth Sci, Sapporo, Hokkaido, Japan;

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