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Using a regional ocean model to understand the structure and variability of acoustic arrivals in Fram Strait

TitleUsing a regional ocean model to understand the structure and variability of acoustic arrivals in Fram Strait
Publication TypeJournal Article
Year of Publication2020
AuthorsGeyer F., Sagen H., Cornuelle B., Mazloff MR, Vazquez H.J
Volume147
Pagination1042-1053
Date Published2020/02
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000515798400005
Keywordsacoustics; Atlantic water; Audiology & Speech-Language Pathology; recirculation; sea
Abstract

A regional ocean model for Fram Strait provides a framework for interpretation of the variability and structure of acoustic tomography arrivals. The eddy-permitting model (52 vertical levels and 4.5 km horizontal resolution) was evaluated using long-term moored hydrography data and time series of depth-range averaged temperature obtained from the inversion of acoustic tomography measurements. Geometric ray modeling using the ocean model fields reproduces the measured arrival structure of the acoustic tomography experiment. The combination of ocean and acoustic models gives insights into acoustic propagation during winter and spring. Moreover, overlapping arrivals coming from different vertical angles can be resolved and explained. The overlapping arrival of purely refracted rays and surface-reflected/bottom-reflected (SRBR) rays has implications for the inversion of tomography data in Fram Strait. The increased knowledge about the ray-length variations of SRBR rays is valuable for choosing appropriate observation kernels for the data assimilation of acoustic tomography data in Fram Strait.

DOI10.1121/10.0000513
Student Publication: 
No
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