基于WOA13数据的南大西洋声波导诊断分析

Diagnosis and analysis of acoustic wave-guide in South Atlantic based on WOA13 data

应用WOA13季节平均数据和BELLHOP模型,在季节、声源频率等因素确定的情况下,在分析南大西洋1—3月声速场,划分声速剖面类型和海区的基础上,研究5 m深度声源的声波导情况。声速剖面类型Ⅰ和类型Ⅱ均可形成汇聚区声波导,首先应考虑表层声速值的影响,其次应考虑声道轴深度的影响,且总体上,汇聚区声波导跨度由低纬度向高纬度递减,并根据表层声速值和反转深度的不同,给出了汇聚区的跨度范围。声速剖面类型Ⅲ的声传播形式则为表面声波导。同时,分析了不同声速剖面类型在传播损失上的异同。

Basing on the analyzed sound speed field, classified the sound speed profile and sea area of the South Atlantic Ocean from January to March under the fixed factors conditions of season and acoustic source frequency, the acoustic wave-guide of acoustic source of 5 m depth was studied by applying the seasonal average data of WOA13 and BELLHOP model. The sound speed profile type Ⅰ and type Ⅱ could form the acoustic wave-guide of convergence zone. Considering the influence of surface sound speed and axial channel with deep-water acoustic track, on the whole, the span of convergence zone decreased from low to high latitude.According to the different surface sound speed and inversion depth, the range of convergence zone span was given. The acoustic propagation mode of sound speed profile type Ⅲ was surface acoustic wave-guide. The similarities and differences of propagation loss in three types acoustic speed was analyzed.