Seasonal observations of the ocean and sea ice environment offshore Oliktok Point, Alaska, using distributed acoustic sensing ...

• Main Authors: Abbott, Robert, Baker, Michael, Peña Castro, Andres Felipe, Stanciu, Christian, Smith, Madison, Schmandt, Brandon, Thomson, Jim
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Arctic; Beaufort Sea; Ice; permafrost; Sea ice; Alaska
• Online Access: https://dx.doi.org/10.57757/iugg23-1121; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018112

<!--!introduction!--> We present new results from a multiyear effort to record environmental signals in the Beaufort Sea using distributed acoustic sensing (DAS). We collected seafloor DAS data on a 36-km long segment of telecom dark fiber for eight one-week intervals in 2021 and 2022. The eight data collects comprise two samplings of each Arctic “season” (ice bound, ice free, and partial ice coverage during freezing and breakup). We recorded icequakes, floating sea-ice collisions, ice grounding events, ice flexural-gravity waves excited by winds, currents, and hovercrafts, ocean gravity waves, earth microseisms, and submarine soil/permafrost resonance. We have used these signals to characterize both sea ice extent and sea-ice thickness in the Beaufort Sea. Sea ice-extent is determined by clustering ambient noise data in 30-minute windows using a convolutional neural network. The presence or absence of ocean gravity waves is the dominant factor in the ice/no-ice clustering. Sea ice thickness is ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...