Investigation of Vertical and Horizontal Momentum Transfer in the Gulf of Mexico Using Empirical Mode Decomposition Method
Investigation of Vertical and Horizontal Momentum Transfer in the Gulf of Mexico Using Empirical Mode Decomposition Method
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DOI：
10.1175/jpo2755.1
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发表时间：
2005-08
影响因子：
3.5
通讯作者：
R. Lai;N. Huang
中科院分区：
文献类型：
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作者：
R. Lai;N. Huang
采用新开发的经验模态分解和希尔伯特谱分析方法（简称希尔伯特-黄变换（HHT））对墨西哥湾（GOM）一系列深锚泊站的数据进行了分析。陆架/斜坡区域附近GOM中的水流被视为两层系统，以800米永久温跃层为划分深度。当使用 HHT 处理数据时，可以识别不同时间尺度的运动。顶层（深度小于800 m）受惯性流和阵发性环流涡流控制，而下层（深度大于800 m）主要受地形罗斯贝波和小规模气旋和反气旋涡控制。利用数据中适当的本征模式分量之间的互相关分析，确定了地形罗斯贝波的波长、相速度和垂直捕获深度。观察结果与 Oey 和 Lee 的建模结果基本一致。
Data from a series of deep mooring stations in the Gulf of Mexico (GOM) have been analyzed with the newly developed empirical mode decomposition and Hilbert spectral analysis method, abbreviated as Hilbert–Huang transformation (HHT). The flows in the GOM near the shelf/slope region are treated as a two-layer system, with the 800-m permanent thermocline as the dividing depth. When the data are treated with HHT, motions of different temporal scales are identified. The top layer (depth less than 800 m) is controlled by inertia flow with episodic Loop Current eddies, while the lower layer (depth greater than 800 m) is controlled primarily by the topographic Rossby waves and small-scale cyclonic and anticyclonic eddies. Using a cross-correlation analysis between the appropriate intrinsic mode components from the data, the wavelength, the phase velocity, and the vertical trapping depth for the topographic Rossby waves were determined. Observations are in general agreement with the modeled results by Oey and Lee.