Statistical Comparison of Ocean Wave Directional Spectra Derived From SWIM/CFOSAT Satellite Observations and From Buoy Observations
Statistical Comparison of Ocean Wave Directional Spectra Derived From SWIM/CFOSAT Satellite Observations and From Buoy Observations
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DOI：
10.1109/tgrs.2022.3199393
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发表时间：
2022
影响因子：
8.2
通讯作者：
Ying Xu;D. Hauser;Jianqiang Liu;Jianyang Si;Chen Yan;Shufen Chen;J. Meng;Chenqing Fan;Meijie Liu;Ping Chen
中科院分区：
文献类型：
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作者：
Ying Xu;D. Hauser;Jianqiang Liu;Jianyang Si;Chen Yan;Shufen Chen;J. Meng;Chenqing Fan;Meijie Liu;Ping Chen
由于采用传统的对比方法，时空匹配对非常有限，因此，在光谱水平上对海浪谱进行遥感和现场测量的对比和验证是非常罕见的。本文提出了一种新的比较方法。利用该方法，在不同海况（风浪为主/涌浪为主）和海面条件（风速小于20 m/s，有效波高1 ~ 7 m）下，对不同海况等级下的面波调查与监测（SWIM）结果与浮标观测结果进行了谱级比较。这包括全向波高谱和方向函数在峰值波数的比较。对比结果表明，在中高海况下，入射角为8°和10°时，SWIM波束提供的波浪方向谱与浮标数据具有较高的一致性。在低海况下，SWIM海浪方向谱的测量偏差主要来自三种现象，按重要性顺序依次为：低波数时非波分量（寄生峰）引起的谱能量异常提升、雷达成像机制中的非线性冲浪板效应和斑点噪声谱密度的轻微低估。
The comparison and verification of ocean wave spectrum by remote sensing and in situ measurements at the spectral level are quite rare because the use of the traditional comparison method leads to very limited spatiotemporal matching pairs. In this article, a new comparison method is proposed. With this method, under different sea conditions (wind wave mainly/swell mainly) and sea surface conditions (wind speed smaller than 20 m/s and significant wave height from 1 to 7 m), mean directional wave height spectra from surface waves investigation and monitoring (SWIM) are compared at the spectral level to the buoy counterparts, in different classes of the sea state. This includes the comparison of the omnidirectional wave height spectrum and the directional function at the peak wavenumber. The comparison results show that, under medium and high sea conditions, wave directional spectra provided by the SWIM beams at 8° and 10° incidence have a high consistency with those from buoy data. Under low sea conditions, the measurement bias of SWIM wave directional spectra mainly comes from three phenomena that are, by order of importance, an abnormal lifting of spectral energy caused by nonwave components at low wave numbers (parasitic peak), from the nonlinear surfboard effect in the radar imaging mechanism, and from a slight underestimation of speckle noise spectral density.