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Midlatitude Baroclinic Rossby Waves in a High-Resolution OGCM Simulation

机译：高分辨率OGCM模拟中的中纬斜压Rossby波

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摘要

The effects of background baroclinic zonal flow and bottom pressure decoupling on midlatitude oceanic Rossby wave dynamics using a high-resolution OGCM simulation are investigated. To examine these effects, the phase speed and vertical structure of the simulated wave are compared with each of the different linear Rossby wave solutions obtained for two different circumstances (with or without background flow) and two different boundary conditions (a flat bottom or a bottom pressure decoupling condition). First, a frequency-wavenumber spectrum is examined for depth anomaly of the permanent thermocline (27.0σ_θ surface) along 32°S. Most of the energy is distributed along the theoretical dispersion curve including the effects of background flow and bottom pressure decoupling. The authors focus on a secondary dominant peak (appearing at a frequency greater than 1 cycle per year) at which the differences between the dispersion curves are large enough to discuss the relation between the spectral peak and the dispersion curves. The phase speed of this peak is nearly 1.5 times larger than that of the standard long-wave theory (flat bottom and no background flow), which is similar to results from previous observational studies. The extended long-wave theory including background flow and bottom pressure decoupling effects overestimates the phase speed. However, taking into account finite wavelength effects, this theory provides a phase speed much closer to that of the secondary dominant peak. The vertical structure corresponding to the wave of the secondary dominant peak extracted by composite analysis is intensified in the surface layer, a result similar to that from the theory including background flow and bottom pressure decoupling effects. The authors also compare the latitudinal distribution of midlatitude phase speed estimated by the frequency-wavenumber spectrum with theoretical results. The theory including background flow, bottom pressure decoupling, and finite wavelength effects reproduces the latitudinal distribution well, suggesting that these effects are important for explaining Rossby wave speed. The dominant factor enhancing the phase speed is bottom pressure decoupling related to rough bottom topography, while north of 30°N the background flow makes a strong contribution to the phase speed enhancement.
机译：利用高分辨率OGCM模拟研究了背景斜压纬向流和底部压力解耦对中纬度海洋Rossby波动力学的影响。为了检查这些影响，将模拟波的相速度和垂直结构与针对两种不同情况（有或没有背景流）和两种不同边界条件（平坦的底部或底部）获得的每个不同的线性Rossby波解进行比较。压力解耦条件）。首先，检查频率-波数频谱中沿32°S方向的永久性跃层（27.0σ_θ表面）的深度异常。大部分能量沿理论色散曲线分布，包括背景流量和底部压力解耦的影响。作者专注于次要主要峰（以每年大于1个周期的频率出现），在该峰处色散曲线之间的差异足够大，可以讨论光谱峰与色散曲线之间的关系。该峰的相速度比标准长波理论（平坦的底部且无背景流动）的相速度快将近1.5倍，这与以前的观测研究结果相似。扩展的长波理论（包括背景流和底部压力解耦效应）高估了相速度。但是，考虑到有限的波长效应，该理论提供的相速度非常接近次级主峰的相速度。在表层中强化了与通过复合分析提取的次要主峰波相对应的垂直结构，其结果与包括背景流和底部压力解耦效应的理论相似。作者还将频率-波数谱估计的中纬度相速度的纬度分布与理论结果进行了比较。包括背景流，底部压力去耦和有限波长效应在内的理论很好地再现了纬向分布，表明这些效应对于解释Rossby波速很重要。增强相速的主要因素是与粗糙底部形貌有关的底部压力解耦，而在30°N以北的背景气流对相速的提高做出了重要贡献。

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  • 来源
    《Journal of Physical Oceanography》 |2009年第9期|2264-2279|共16页
  • 作者

    Unihiro Aoki; Atsushi Kubokawa; Hideharu Sasaki; Yoshikazu Sasai;

  • 作者单位

    Department of Natural History Sciences, Faculty of Science, Hokkaido University, 060-0810 Sapporo, Japan;

    Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan;

    Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology Yokohama, Kanagawa, Japan;

    Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology Yokohama, Kanagawa, Japan;

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