Spectral Characteristics of Gravity‐Capillary Waves, With Connections to Wave Growth and Microbreaking
Spectral Characteristics of Gravity‐Capillary Waves, With Connections to Wave Growth and Microbreaking
复制标题
重力毛细波的光谱特征与波生长和微破裂的关系
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Banner
中科院分区：
文献类型：
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作者：
N. Laxague;C. Zappa;D. A. LeBel;M. Banner
为了更好地理解海气相互作用的物理过程，有必要更好地描述海浪对风强迫的短尺度响应。对于小到足以躲避传统浮标和基于点的测量的观测，但大到足以明显改变大气和海洋之间的动量转移的波来说，情况尤其如此。这种波在地球的S引力和海气表面张力的共同作用下恢复到平衡状态，因此经典的fi阳离子被称为“重力-毛细管”。“雷达遥感技术在很大程度上依赖于这些波，以便从远处提取有用的物理参数。尽管有这种重要性，fi对重力-毛细波特征的现场观测并不常见，而且不同研究的结果也不同。此外，前缘模型波数谱通常在形状或重要的谱参数上彼此不匹配。在此，我们对圣巴巴拉海峡研究平台浮式仪器平台上的偏振相机收集的短波数据进行了扩展分析。我们的波数饱和谱表明，在低风级(u*~0.045 m/S)的重力-毛细管子范围内出现一个峰值，这与空气侧稳定度理论中的临界波增长一致，以前只在实验室观察到。最后讨论了微破裂对海浪频谱特性的影响。
In order to improve our understanding of physical air-sea interaction, it is essential to better describe the short-scale ocean wave response to wind forcing. This is particularly true for waves which are small enough to evade observation by traditional buoy and point-based gauge measurements but large enough to appreciably alter the transfer of momentum between atmosphere and ocean. Such waves are restored to equilibrium both by the Earth ’ s gravity and air-sea surface tension, hence the classi fi cation as “ gravity-capillary. ” Radar remote sensing techniques depend greatly upon these waves in order to extract useful physical parameters from afar. Despite this importance, fi eld observations of gravity-capillary wave characteristics are uncommon and results vary from study to study. Furthermore, leading-edge model wave number spectra generally do not match each other in shape or important spectral parameters. Here we present an extended analysis of short wave data collected via a polarimetric camera aboard Research Platform Floating Instrument Platform in the Santa Barbara Channel. Our wave number saturation spectra show the emergence of a peak in the gravity-capillary subrange at low wind forcing magnitude ( u * ~0.045 m/s), consistent with critical wave growth in air side stability theory and previously only observed in the laboratory. Finally, the effects of microbreaking on wave spectral characteristics are discussed.
影响因子：
3.5
作者：
Lenain, Luc;Melville, W. Kendall
通讯作者：
Melville, W. Kendall