Wave Groups Observed in Pancake Sea Ice
Wave Groups Observed in Pancake Sea Ice
复制标题
在薄饼海冰中观察到的波群
DOI：
10.1029/2019jc015354
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
F. Ardhuin
中科院分区：
文献类型：
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作者：
J. Thomson;J. Gemmrich;W. Rogers;Clarence O. Collins;F. Ardhuin
通过海冰传播的海洋表面波被散射和消散。净衰减优先发生在较高频率处，因此相对于开放水域，给定波场的频谱带宽减小。带宽的减小与波场的群性的增加相关联。使用2015年北极海状态实验中的表面波仪器浮子和跟踪浮标数据，比较了煎饼冰和开放水域条件之间的带宽，并探讨了与组包络的联系。冰中波群的增强与谱带变窄的波叠加的简单线性机制一致。这是使用合成数据证实。非线性机制，这已被证明是显着的其他冰类型，没有发现是重要的，在这个数据集。
Ocean surface waves propagating through sea ice are scattered and dissipated. The net attenuation occurs preferentially at the higher frequencies, and thus the spectral bandwidth of a given wave field is reduced, relative to open water. The reduction in bandwidth is associated with an increase in the groupiness of the wave field. Using Surface Wave Instrument Float with Tracking buoy data from the 2015 Arctic Sea State experiment, bandwidth is compared between pancake ice and open water conditions, and the linkage to group envelopes is explored. The enhancement of wave groups in ice is consistent with the simple linear mechanism of superposition of waves with narrowing spectral bandwidth. This is confirmed using synthetic data. Nonlinear mechanisms, which have been shown as significant in other ice types, are not found to be important in this data set.