Effect of Subsurface Mediterranean Water Eddies on Sound Propagation Using ROMS Output and the Bellhop Model

Type Article
Date 2021-12
Language English
Author(s) Hassantabar Bozroudi Seyed Hossein2, 7, Ciani Daniele3, Mahdizadeh Mahdi Mohammad2, Akbarinasab Mohammad4, Barbosa Aguiar Ana Claudia5, Peliz Alvaro5, Chapron Bertrand1, Fablet Ronan6, Carton Xavier7
Affiliation(s) 1 : Laboratoire d’Océanographie Physique et Spatiale, Université de Bretagne Occidentale, Ifremer, IRD, CNRS, 29280 Brest, France
2 : Department of Non-Biologic Atmospheric and Oceanic Sciences, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas 79177, Iran
3 : Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine (CNR-ISMAR), 00133 Rome, Italy
4 : Faculty of Marine and Oceanic Sciences, University of Mazandaran, Babolsar 29280, Iran
5 : Instituto Dom Luiz, Faculdade de Ciencias da Universidade de Lisboa, 1749-016 Lisbon, Portugal
6 : Institut Mines Telecom Atlantique, Technopole Brest Iroise, 29280 Plouzane, France
7 : Laboratoire d’Océanographie Physique et Spatiale, Université de Bretagne Occidentale, Ifremer, IRD, CNRS, 29280 Brest, France
Source Water (2073-4441) (MDPI), 2021-12 , Vol. 13 , N. 24 , P. 30p.
DOI 10.3390/w13243617
Note This article belongs to the Special Issue Hydroacoustics in Marine, Transitional and Freshwaters
Keyword(s) Mediterranean Water eddies, sound propagation, ROMS model, Bellhop model
Abstract

Ocean processes can locally modify the upper ocean density structure, leading to an attenuation or a deflection of sound signals. Among these phenomena, eddies cause significant changes in acoustic properties of the ocean; this suggests a possible characterization of eddies via acoustics. Here, we investigate the propagation of sound signals in the Northeastern Atlantic Ocean in the presence of eddies of Mediterranean Water (Meddies). Relying on a high-resolution simulation of the Atlantic Ocean in which Meddies were identified and using the Bellhop acoustic model, we investigated the differences in sound propagation in the presence and absence of Meddies. Meddies create sound channels in which the signals travel with large acoustic energy. The transmission loss decreases to 80 or 90 dB; more signals reach the synthetic receivers. Outside of these channels, the sound signals are deflected from their normal paths. Using receivers at different locations, the acoustic impact of different Meddies, or of the same Meddy at different stages of its life, are characterized in terms of angular distributions of times of arrivals and of energy at reception. Determining the influence of Meddies on acoustic wave characteristics at reception is the first step to inverting the acoustic signals received and retrieving the Meddy hydrological characteristics.

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Hassantabar Bozroudi Seyed Hossein, Ciani Daniele, Mahdizadeh Mahdi Mohammad, Akbarinasab Mohammad, Barbosa Aguiar Ana Claudia, Peliz Alvaro, Chapron Bertrand, Fablet Ronan, Carton Xavier (2021). Effect of Subsurface Mediterranean Water Eddies on Sound Propagation Using ROMS Output and the Bellhop Model. Water, 13(24), 30p. Publisher's official version : https://doi.org/10.3390/w13243617 , Open Access version : https://archimer.ifremer.fr/doc/00740/85249/