Data to accompany the article "Observations of whitecap coverage and the relation to wind stress, wave slope, and turbulent dissipation"
Data to accompany the article "Observations of whitecap coverage and the relation to wind stress, wave slope, and turbulent dissipation"
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DOI：
10.1002/2015jc011196
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发表时间：
2015-11
期刊：
影响因子：
--
通讯作者：
M. Schwendeman;J. Thomson
中科院分区：
文献类型：
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作者：
M. Schwendeman;J. Thomson
船上对北太平洋两个航次的白浪覆盖范围进行了测量，并与风速和摩擦速度、平均波浪陡度和近地表湍流耗散的现场测量进行了比较。提出了一种适用于所有变量的阈值幂定律，它结合了幂定律的灵活性和白纸打磨中常见的阈值行为。白云覆盖率与风速的拟合度U10与最近的三个研究的相似关系非常接近，特别是在6-14m/S的范围内。在较高的风速下，白云覆盖率数据相对于拟合值趋于平稳，而对残差的分析表明，在快速发展的海浪中，白云覆盖率减少了。研究了海浪斜率变量对风速参数的潜在改善作用。在这些变量中，平衡射程波的均方斜率具有最好的统计量，经方向扩展和频带带宽归一化后，其统计量进一步提高。最后，将白云覆盖范围与湍流耗散的测量结果进行了比较。虽然在统计上仍然显著，但这种相关性比风或浪的关系更差，残差随着波龄的增加显示出强烈的负趋势。这可能是由于在较老的风海中微破裂的影响增加。
Shipboard measurements of whitecap coverage are presented from two cruises in the North Pacific, and compared with in situ measurements of wind speed and friction velocity, average wave steepness, and near-surface turbulent dissipation. A threshold power law fit is proposed for all variables, which incorporates the flexibility of a power law with the threshold behavior commonly seen in whitecapping. The fit of whitecap coverage to wind speed, U10, closely matches similar relations from three recent studies, particularly in the range of 6–14 m/s. At higher wind speeds, the whitecap coverage data level off relative to the fits, and an analysis of the residuals shows some evidence of reduced whitecapping in rapidly developing waves. Wave slope variables are examined for potential improvement over wind speed parameterizations. Of these variables, the mean square slope of the equilibrium range waves has the best statistics, which are further improved after normalizing by the directional spread and frequency bandwidth. Finally, the whitecap coverage is compared to measurements of turbulent dissipation. Though still statistically significant, the correlation is worse than the wind or wave relations, and residuals show a strong negative trend with wave age. This may be due to an increased influence of microbreaking in older wind seas.