Using a regional ocean model to understand the structure and variability of acoustic arrivals in Fram Strait
Using a regional ocean model to understand the structure and variability of acoustic arrivals in Fram Strait
复制标题
DOI：
10.1121/10.0000513
复制
发表时间：
2020-02-01
影响因子：
2.4
通讯作者：
Vazquez, Heriberto J.
中科院分区：
文献类型：
--
作者：
Geyer, Florian;Sagen, Hanne;Vazquez, Heriberto J.
弗拉姆海峡的区域海洋模式提供了一个框架，解释的变化和结构的声波层析到达。使用长期系泊水文数据和从声波层析成像测量反演获得的深度-范围平均温度时间序列，对涡流允许模型（52个垂直高度和4.5公里水平分辨率）进行了评价。使用海洋模型场的几何射线建模再现了声层析成像实验的测量到达结构。海洋和声学模型的结合提供了冬季和春季声学传播的见解。此外，来自不同垂直角度的重叠到达可以被分辨和解释。纯折射射线和表面反射/底部反射（SRBR）射线的重叠到达对弗拉姆海峡的层析成像数据的反演具有影响。SRBR射线的射线长度变化的知识的增加是有价值的选择合适的观测核的数据同化的弗拉姆海峡的声学层析成像数据。
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.