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首页> 外文期刊>Journal of Physical Oceanography >On the Transfer Function between Surface Fields and the Geostrophic Stream Function in the Mediterranean Sea
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On the Transfer Function between Surface Fields and the Geostrophic Stream Function in the Mediterranean Sea

机译：地中海地表场之间的传递函数与地转流函数

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摘要

The real transfer function and the phase shift between sea surface height (SSH) and sea surface buoyancy (SSB) were estimated from the output of a realistic eddy-resolving model of the Mediterranean Sea circulation. The analysis of their temporal evolution unveiled the existence of a clear seasonal cycle closely related to that of the mixed layer depth. The phase shifts between SSH and SSB attain their minimum for deep mixed layers, which is different from zero. Besides, the spectral slope of the transfer function at scales shorter than 100km fluctuates between k~(-1) and k~(-2). For deep mixed layers, it is close to k~(-1) as predicted by the surface quasigeostrophic (SQG) solution. At longer wavelengths, it is approximately constant under the different environmental conditions in all of the subbasins analyzed with the exception of the Gulf of Lions. The capability to observe sea surface temperature (SST) from satellites motivated the extension of this analysis to SST and SSH. Results showed a similar qualitative behavior but with larger phase shifts. In spite of the presence of a phase shift, even for deep mixed layers, results revealed that it is still possible to reconstruct surface dynamics from SST using a transfer function, provided that the mixed layer is deep enough. For the present study, a threshold value of 70 m was enough to identify the appropriate environmental conditions. In addition, the results revealed that a precise estimation of the transfer function significantly improves the reconstruction of the flow in comparison with the application of the classical SQG solution.
机译：真实的传递函数和海面高度（SSH）与海面浮力（SSB）之间的相移是根据地中海环流的现实涡旋解析模型的输出估算的。对它们的时间演变的分析揭示了存在一个清晰的季节周期，该季节周期与混合层深度密切相关。对于深层混合层，SSH和SSB之间的相移达到最小值，该值不同于零。此外，传递函数的谱斜率在小于100 km的尺度上在k〜（-1）和k〜（-2）之间波动。对于深层混合层，如表面准营养（SQG）溶液所预测的，它接近k〜（-1）。在更长的波长处，除了狮子湾以外，在所分析的所有子流域中，在不同环境条件下，其近似恒定。从卫星观测海表温度（SST）的能力促使该分析扩展到SST和SSH。结果显示出类似的定性行为，但相移较大。尽管存在相移，即使对于深混合层，结果显示，只要混合层足够深，仍然可以使用传递函数从SST重建表面动力学。对于本研究，阈值70 m足以确定适当的环境条件。此外，结果表明，与经典SQG解决方案的应用相比，传递函数的精确估计可以显着改善流动的重构。

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