Understanding the background wave-in-ice signal for improved ice profiler performance

夏季冰层面积的减少为产生海面波打开了北极的大片区域。现在，在北极西部经常观测到超过5米的海浪高度。海浪构成了越来越多的海岸侵蚀线，影响了海洋作业和航运，并对每年冰盖的破裂和重新冻结产生了深刻影响。波在冰中传播的物理是复杂的，包括在冰缘的反射，主要是较短波长的粘性衰减，弯曲传播，从而导致基本波性质的非线性变化，如波长和波周期。40多年来，ASL一直为北极的冰监测提供观测设备和数据分析。ASL开发的一个关键仪器是冰层剖面仪声纳(IPS)。在本项目中，我们将开发算法来扩展IPS功能，以包括冰中波动过程。几年的IPS数据为理解IPS数据中存在的各种波动过程提供了基础，并开发了改进的算法，最终使IPS能够适应新兴的季节性无冰的北极。

The decreased summer ice extent has opened wide regions of the Arctic for the generation of surface waves. Wave heights of more than 5m are now observed regularly in the Western Arctic. The waves constitute an increasing thread of coastal erosion, affecting marine operations and shipping, and have a profound impact on the annual break-up and re-freezing of the ice cover. The physics of wave propagating into ice are complex, and include reflection at the ice edge, viscous dampening of mainly shorter wave length, flexural transmission and thus non-linear transformation of basic wave properties like wave length and wave period.ASL has been providing observational equipment and data analysis for ice monitoring in the Arctic for over 40 years. A key instrument developed at ASL is the Ice Profiler Sonar (IPS). In this project, we will develop algorithms to extend the IPS capabilities to include wave-in-ice processes. Several years of IPS data provide the basis for understanding the various wave processes present in IPS data, and to develop improved algorithm, ultimately allowing the adaptation of the IPS to the emerging, seasonally ice-free Arctic.