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

夏季冰面积的减少为表面波的产生打开了北极广阔的区域。现在在北极西部经常观察到超过5米的波高。海浪是海岸侵蚀的一个日益严重的因素，影响到海洋作业和航运，并对冰盖每年的破裂和重新冻结产生深远影响。波浪在冰中传播的物理过程十分复杂，包括冰缘的反射、主要是较短波长的粘性阻尼、弯曲传播以及波长和波周期等基本波浪特性的非线性变化。ASL公司40多年来一直为北极冰监测提供观测设备和数据分析。ASL开发的一种关键仪器是冰廓线声纳（IPS）。在这个项目中，我们将开发算法来扩展IPS功能，包括冰中波过程。几年的IPS数据提供了基础，了解各种波过程中存在的IPS数据，并开发改进的算法，最终允许适应新兴的，季节性无冰的北极的IPS。

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.