Reduction of wind stress due to swell at high wind conditions
Reduction of wind stress due to swell at high wind conditions
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DOI：
10.1029/2011jc007833
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发表时间：
2012-11
影响因子：
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通讯作者：
H. García-Nava;F. Ocampo-Torres;P. Hwang;P. Osuna
中科院分区：
文献类型：
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作者：
H. García-Nava;F. Ocampo-Torres;P. Hwang;P. Osuna
[1] 海洋上的风应力取决于海面粗糙度，而海面粗糙度由海况决定。一方面，不发达的风海比完全发达的风海更汹涌，增加了阻力。另一方面，涌浪的存在可以通过改变风海粗糙度来改变风应力。当不发达的局部波浪与涌浪共存时，后一种机制被认为在强风时会产生很大的影响。在遭受强风和持续风的地区，对有限生长条件下的风应力和波场进行了详细测量。通过波场观测分析发现，涌浪的存在对短风浪产生了抑制作用。观察到的衰减对于较年轻的风海来说更大，并且随着风浪变老而减小。上述风浪与气流相互作用的模拟结果表明，短风波的衰减导致波浪支撑应力的减小，从而降低了总风应力。
[1] Wind stress over the ocean depends on the sea surface roughness which is determined by the sea state. On one hand, underdeveloped wind seas, rougher than their fully developed counterpart, increase the drag. On the other hand, the presence of swell can modify wind stress by modifying the wind sea roughness. This latter mechanism is believed to have a great impact at high winds whenever underdeveloped local waves coexist with swell. Detailed measurements of wind stress and wavefield in fetch-limited growth conditions were made in an area subjected to strong and persistent winds. Through the analysis of wavefield observations, it is found that the presence of swell dampens the short wind waves. The observed attenuation is greater for younger wind seas and decreases as the wind waves become older. Results obtained from modeling the interaction of wind waves and the air flow above point out that the attenuation of short wind waves causes a reduction of the wave-supported stress, which in turn decreases the total wind stress.