Southern Ocean Acoustic Propagation for Tracking Floats

0244305 SPEER将对南大洋中的声传播进行理论研究和现场测试，以帮助确定规划未来实地工作所需的实验参数。由于对与南大洋浮标跟踪相关的信号的大规模声学传播知之甚少，这一结果也将具有一些根本的意义。未来对南大洋小尺度(次网格尺度)过程的作用、它们产生的输送及其对更大尺度环流的影响的观测研究将涉及测量技术的组合，包括拉格朗日技术，因为这些技术在限制侧向涡通量方面发挥了关键作用。在各种环境中，还部署了花车，用故意释放的示踪剂支持侧向和昼夜活动研究。然而，声学跟踪浮标以前没有在南大洋的大型实验中使用过，在ACC以北的Agulhas-Benguela洋流系统之外(仍然在亚热带地区)。为了能够合理地进行实验设计，需要回答采样要求的色散问题和浮标跟踪的声音传播问题。

0244305 SpeerA theoretical study of acoustic propagation in the Southern Ocean and an in-situ test will be conducted to help determine the experimental parameters needed to plan future field work. The results will also be of some fundamental interest since so little is known about large-scale acoustical propagation of signals relevant to float tracking in the Southern Ocean. Future observational studies of the role of small-scale (subgrid scale) processes in the Southern Ocean, the transports they produce, and their effect on the larger scale circulation will involve a combination of measurement techniques, including Lagrangian techniques, because these have played a key role constraining lateral eddy fluxes. Floats have also been deployed to support both lateral and diapycnal studies with deliberately released tracers, in a variety of environments. Acoustically tracked floats have not, however, previously been used in large-scale experiments in the Southern Ocean, outside of the Agulhas-Benguela current system just north of the ACC (and still within the subtropics). Questions of dispersion, for sampling requirements, and sound propagation, for float tracking, need to be answered to be able to proceed reasonably with experiment design.