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Acoustical Characteristics and Simulated Tomographic Inversion of a Cold Core Eddy in the Bay of Bengal

机译：孟加拉湾冷核涡流的声学特性和模拟层析成像反演

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摘要

Acoustic characteristics of a subsurface, cold core eddy observed in the Bay of Bengal during the southwest monsoon period is presented based on conductivity temperature depth dala from 42 stations. The effect of the eddy is to reduce the ambient sound speed by about lOm/s. Under the influence of the eddy, the depth of the SOFAR channel axis remains constant (1600m), which otherwise should have shown a deepening in this region. Simulated ray arrival structure depicts the typical characteristics of a weak acoustic wave guide in the Bay of Bengal - the early arrival cluster of near-axial flat angle rays, later arrivals of deep turning rays, followed by the weak latest arrivals of near-surface turning rays. The arrivals of the acoustic rays are delayed by about 100-200ms under the influence of the eddy. The intensity computations show that when a ray passes through the eddy, it suffers an additional loss of 20-25 dB. From the simulated travel time delays, the eddy profile is reconstructed through a generalised inversion, based on the singular value decomposition technique, the numerical experiment shows that 18 eigenrays with 9 layers enable reconstuction of the eddy profile edequately using 9 eigenmodes.
机译：基于42个台站的电导率温度深度数据，给出了西南季风期间在孟加拉湾观测到的地下冷核涡流的声学特征。涡流的作用是将环境声速降低约10m / s。在涡流的影响下，SOFAR通道轴的深度保持恒定（1600m），否则应该表明该区域已加深。模拟的射线到达结构描绘了孟加拉湾弱声波导管的典型特征-近轴平角射线的早期到达簇，深转向射线的较晚到达，随后近表面转向的较弱的最新到达射线。在涡流的影响下，声线的到达延迟了大约100-200ms。强度计算表明，当光线穿过涡流时，它会额外损失20-25 dB。从模拟的旅行时延出发，通过广义反演重建涡旋轮廓，基于奇异值分解技术，数值实验表明，利用9个本征模，可以通过18层9层的特征射线充分重构涡旋轮廓。

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