Ocean Surface Wind Estimation From Waves Based on Small GPS Buoy Observations in a Bay and the Open Ocean
Ocean Surface Wind Estimation From Waves Based on Small GPS Buoy Observations in a Bay and the Open Ocean
复制标题
基于海湾和公海小型 GPS 浮标观测的波浪海洋表面风估算
DOI：
10.1029/2022jc018786
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Miyashita Takuya
中科院分区：
文献类型：
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作者：
Shimura Tomoya;Mori Nobuhito;Baba Yasuyuki;Miyashita Takuya
海面风浪信息在沿海减灾、近海结构设计、大气-海洋通量估算等领域具有重要的应用价值。本研究提出了一种利用小型全球定位系统浮标测量的海面波谱信息估算海面风的新方法。这种方法的概念依赖于这样的假设，即海浪频谱的高频部分与摩擦速度和频率成正比。本研究对系数的确定算法进行了优化。假设风向与海浪高频部分的传播方向一致，由海浪交叉谱确定风向。将所提出的风估计方法应用于海湾和开阔海域的观测，结果表明，该方法在海湾和开阔海域的风估计性能相近。与以前的方法相比，该方法改进了风的估计，特别是在沿海地区和开阔海域的高风速时。由于波谱形状的不同，前人研究的方法在海湾和开阔海域的性能有所不同。利用该方法可以获得高质量的风浪信息。如果大规模部署小型漂流浮标覆盖全球海洋，基于所提出的方法的信息可能相当强大，可以弥补基于卫星的风浪估计的弱点。
Ocean surface wind and wave information is important in a wide variety of areas, such as coastal disaster reduction, offshore structure design, and atmosphere‐ocean flux estimation. This study proposed a new method for ocean surface wind estimation from surface wave spectrum information measured by small global positioning system buoys. The concept of this method relies on the assumption that the high‐frequency part of the ocean‐wave spectrum is proportional to where is the friction velocity and is the frequency. The determination algorithm for the coefficient of was optimized in this study. The wind direction was determined by the wave cross‐spectrum, assuming that the wind direction aligns the propagation direction of the high‐frequency part of the wave. The proposed wind estimation method was applied to bay and open ocean observations, and the performance of the proposed wind estimation method was similar between the bay and the open ocean. The proposed method improves the wind estimation especially in coastal areas and at high wind speeds in the open ocean compared with the previous method. The performance of the method of the previous study differs between the bay and open ocean due to their spectral shape differences. High‐quality wind and wave information can be obtained using the proposed method. If the mass deployment of small drifting buoys covered the global ocean, the information based on the proposed method could be considerably powerful, and could compensate for the weakness of satellite‐based wind and wave estimations.