The significant reduction of the sea ice extent in the western Arctic has been observed by the sustained satellite observations since 1979. The opening ocean is now allowing waves to evolve and propagate under the presence of the Arctic sea ice. A better understanding of the wave-ice interaction is necessary for the safe shipping over the sea ice covered Arctic Ocean and to improve the Arctic climate projection. During R/V Mirai Arctic Expedition in October 2019, two drifting wave-buoys were concurrently deployed in the open ocean and the Arctic marginal ice zone (MIZ) with grease ice and pancake ice. The wave and sea ice conditions at the time of the deployments were documented in detail. Based on the wave buoy data and the sea ice edge estimated by a Synthetic Aperture Radar (SAR) image, attenuation rates of waves under the grease ice are estimated. Good agreement in the frequency dependency of the wave attenuation rate is presented between the observational results and the theoretical prediction from the viscous model of Weber (1987). The agreement implies that the observed surface waves were attenuated by the viscous damping beneath grease ice. It is also found that the observed attenuation rates were generally lower than the previous studies. Several possible factors are discussed, such as the sea ice type, wind energy input, and uncertainties in the estimation of the attenuation rate.

自1979年以来持续进行的卫星观测已经观测到了北极西部海冰范围的显着减少。开放的海洋现在允许海浪在北极海冰的存在下演化和传播。对于在冰雪覆盖的北冰洋上安全运输并改善北极的气候投影，有必要更好地了解海冰相互作用。在2019年10月的Mirai北极探险R / V中，同时在野外海洋和北极边缘冰带（MIZ）上部署了两个漂流浮标，上面有油脂冰和薄煎饼冰。详细记录了部署时的海浪和海冰状况。根据波浪浮标数据和合成孔径雷达（SAR）图像估算的海冰边缘，估计了油脂冰下波浪的衰减率。观测结果与Weber（1987）粘性模型的理论预测之间在波衰减率的频率相关性方面表现出良好的一致性。该协议意味着观察到的表面波被油脂冰下面的粘性阻尼所衰减。还发现观察到的衰减率通常低于以前的研究。讨论了几种可能的因素，例如海冰类型，风能输入以及衰减率估算中的不确定性。该协议意味着观察到的表面波被油脂冰下面的粘性阻尼所衰减。还发现观察到的衰减率通常低于以前的研究。讨论了几种可能的因素，例如海冰类型，风能输入以及衰减率估算中的不确定性。该协议意味着观察到的表面波被油脂冰下面的粘性阻尼所衰减。还发现观察到的衰减率通常低于以前的研究。讨论了几种可能的因素，例如海冰类型，风能输入以及衰减率估算中的不确定性。