Parametric Model for Eddies‐Induced Sound Speed Anomaly in Five Active Mesoscale Eddy Regions
Wen Chen, Yongchui Zhang, Yuyao Liu, Lina Ma, Haodi Wang, Kaijun Ren, Shiyao Chen
Abstract
Abstract Mesoscale eddies are ubiquitous in the ocean. Their acoustic properties have attracted considerable research attention. However, the three‐dimensional structure for eddy‐induced sound speed anomalies has remained obscure, hindering further understanding of the impact of eddies on acoustic propagation. To solve this problem, a region‐dependent parametric model for eddy‐induced sound speed anomaly (SSA) structure is established by performing a composite analysis based on abundant profiles measured by Argo floats and the corresponding satellite altimetry data. The parametric SSA model can be applied to fast reconstruct the underwater sound speed (SS) field of the eddy based only on the intensity and radius of the eddy. A comparison with a surveyed eddy shows that the errors of the reconstructed SSA are 2.36 m/s (8.33%) in strength and 37 m (9.37%) in core depth. The reconstructed SS field is employed to study the sound propagation characteristics in the presence of a cyclonic eddy with the ray‐tracing method. The results show that the parametric model can advance eddy‐acoustic effect research in the case of observation data shortages.