| Summary: | © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Bonnel, J., Kinda, G. B., & Zitterbart, D. P. Low-frequency ocean ambient noise on the Chukchi Shelf in the changing Arctic. Journal of the Acoustical Society of America, 149(6), (2021): 4061–4072, https://doi.org/10.1121/10.0005135. This article presents the study of a passive acoustic dataset recorded on the Chukchi Shelf from October 2016 to July 2017 during the Canada Basin Acoustic Propagation Experiment (CANAPE). The study focuses on the low-frequency (250–350 Hz) ambient noise (after individual transient signals are removed) and its environmental drivers. A specificity of the experimental area is the Beaufort Duct, a persistent warm layer intrusion of variable extent created by climate change, which favors long-range acoustic propagation. The Chukchi Shelf ambient noise shows traditional polar features: it is quieter and wind force influence is reduced when the sea is ice-covered. However, the study reveals two other striking features. First, if the experimental area is covered with ice, the ambient noise drops by up to 10 dB/Hz when the Beaufort Duct disappears. Further, a large part of the noise variability is driven by distant cryogenic events, hundreds of kilometers away from the acoustic receivers. This was quantified using correlations between the CANAPE acoustic data and distant ice-drift magnitude data (National Snow and Ice Data Center). This research was supported by the Independent Research and Development Program at WHOI and by the Office of Naval Research (ONR) under Grant Nos. N00014-19-1-2627 and N00014-18-1-2811. J.B. warmly acknowledges D. Cazau (ENSTA Bretagne, France) for helpful discussion and code sharing. The acoustic data collection effort was supported by the ONR under Grant No. N00014-15-1-2196 (Principal Investigator: Y.-T. Lin, WHOI). Thanks also go to crew members of the R/V Sikuliaq and USCGC Healy for assisting in ...
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