Changes in the Arctic environment with regard to declining sea ice are expected to alter the ambient sound field, affecting both the sound generating processes and the sound propagation. This paper presents acoustic recordings collected on the 150-m isobath on the Chukchi Shelf over a yearlong period spanning October 2016 to October 2017. The analysis uses sections of recordings approximately 12 min long collected six times daily. The measurements were collected on a vertical line array spanning the lower 110 m of the water column. The 25th percentile level is used to characterize the spectral shape of the background sound between 40 Hz and 4 kHz. The ambient sound data are analyzed using k-means clustering to quantify the occurrence of six spectral shapes over the yearlong experiment. Each cluster type is associated with a different sound generation process based on the correlations with environmental observations. The cluster observed most frequently was associated with wind-generated sound based on a correlation of sound level with wind speed as well as occurrence during the open water season. The cluster with the smallest number of observations was attributed to wind effects on frazil ice forming in open leads during the ice-covered season.

中文翻译：

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对楚科奇架上 40 Hz 至 4 kHz 频率范围内长达一年的环境声音记录进行聚类分析

北极环境因海冰减少而发生的变化预计会改变环境声场，从而影响声音产生过程和声音传播。本文介绍了 2016 年 10 月至 2017 年 10 月在楚科奇陆架 150 米等深线收集的声学记录。该分析使用了每天六次收集的约 12 分钟长的记录片段。测量值是在横跨水柱下部 110 m 的垂直线阵列上收集的。第 25 个百分位水平用于表征 40 Hz 和 4 kHz 之间背景声音的频谱形状。使用 k 均值聚类分析环境声音数据，以量化在长达一年的实验中出现的六种频谱形状。根据与环境观察的相关性，每种聚类类型都与不同的声音生成过程相关联。根据声级与风速的相关性以及开放水域季节的发生，最常观察到的集群与风产生的声音有关。观测次数最少的星团归因于风对冰覆盖季节开放引线中脆弱冰形成的影响。