Using a regional ocean model to understand the structure and variability of acoustic arrivals in Fram Strait.
| Autor: | Geyer F; Nansen Environmental and Remote Sensing Center, N-5006 Bergen, Norway., Sagen H; Nansen Environmental and Remote Sensing Center, N-5006 Bergen, Norway., Cornuelle B; Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0225, USA., Mazloff MR; Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0225, USA., Vazquez HJ; Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0225, USA. |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of the Acoustical Society of America [J Acoust Soc Am] 2020 Feb; Vol. 147 (2), pp. 1042. |
| DOI: | 10.1121/10.0000513 |
| Abstrakt: | 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. |
| Databáze: | MEDLINE |
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