Airborne Remote Sensing of Wave Propagation in the Marginal Ice Zone
Airborne Remote Sensing of Wave Propagation in the Marginal Ice Zone
复制标题
边缘冰区波浪传播的机载遥感
DOI：
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
P. Wadhams
中科院分区：
文献类型：
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作者：
P. Sutherland;J. Brozena;W. Rogers;M. Doble;P. Wadhams
机载扫描激光雷达用于测量 2015 年 10 月波弗特海两次独立波浪事件期间边缘冰区 (MIZ) 表面波场的演变。激光雷达数据由水平分辨率在 17 至 33 厘米之间的二维表面高程场组成，覆盖约 150-220 m 宽的区域，以飞机地面轨迹为中心。这些数据用于计算表面波场的定向波数谱。与几乎并置的浮标数据进行比较发现，激光雷达和浮标测量结果总体一致。在第一个事件中，从开放水域传播到冰中的波浪被冰减弱了。衰减的低光谱扩展和 k7/4 光谱依赖性与将海冰视为漂浮在粘性较低海洋上的高粘性流体的耗散模型一致。使用该模型计算的上层海洋涡粘度被发现明显低于以前的工作。第二个事件是在离冰风和寒冷的温度下进行的，从而可以测量结冰条件下的波取关系。发现波的增长速率略高于之前在没有冰形成的不稳定大气条件下的测量结果。与 WAVEWATCH III 模型输出的比较凸显了在冰边缘附近进行预测时准确的冰信息和精细的地理计算分辨率的重要性。最后，讨论了观察到 MIZ 中波场演化的非常短的尺度。
Airborne scanning lidar was used to measure the evolution of the surface wave field in the marginal ice zone (MIZ) during two separate wave events in the Beaufort Sea in October 2015. The lidar data consisted of a 2-D field of surface elevation with horizontal resolutions between 17 and 33 cm, over a swath approximately 150-220 m wide, centred on the ground track of the aircraft. Those data were used to compute directional wavenumber spectra of the surface wave field. Comparison with nearly collocated buoy data found the lidar and buoy measurements to be generally consistent. During the first event, waves traveling from open water into the ice were attenuated by the ice. The low spectral spreading and k7/4 spectral dependence of the attenuation was consistent with dissipative models that treat sea ice as a highly viscous fluid floating on a less viscous ocean. Upper-ocean eddy viscosities calculated using that model were found to be significantly lower than those from previous work. The second event was in off-ice winds and cold temperatures, allowing measurement of the wave fetch relation in ice-forming conditions. The wave growth rate was found to be slightly higher than previous measurements under unstable atmospheric conditions without ice formation. Comparison with WAVEWATCH III model output highlighted the importance of accurate ice information and fine geographic computational resolution when making predictions near the ice edge. Finally, the very short scales over which the wave field was observed to evolve in the MIZ are discussed.
影响因子：
3.5
作者：
Lenain, Luc;Melville, W. Kendall
通讯作者：
Melville, W. Kendall