Acoustic Tomography in Oceanic Systems
Summary
Acoustic tomography employs the transmission and reception of low-frequency sound signals across ocean basins to infer spatial and temporal variations in water properties. By precisely measuring the travel times of acoustic pulses between fixed or mobile arrays, researchers reconstruct three-dimensional fields of temperature, salinity and current velocity. The technique exploits the strong dependence of sound speed on temperature and pressure, allowing synoptic coverage over scales from coastal embayments to transoceanic transects. Since its inception in the 1970s, acoustic tomography has matured into a critical tool for assessing ocean circulation, monitoring climate-driven heat content changes and validating numerical models. The method’s non-intrusive nature enables continuous observation beneath ice cover or in deep channels where conventional sensors may be impractical. Recent advances in inversion algorithms, array design and acoustic modelling have enhanced resolution and reduced uncertainty, extending the reach of tomography to fine-scale features such as mesoscale eddies, tidal flow and internal wave fields. Applications span from quantifying global heat uptake to mapping submarine current patterns, underscoring the technique’s central role in understanding and forecasting marine dynamics.
Research from Nature Portfolio
No recent Nature Portfolio content available.
Acoustic Tomography in Oceanic Systems publication trend
The graph below shows the total number of articles in acoustic tomography in oceanic systems across all publications each year (not limited to Nature Index journals).
Technical terms
Acoustic tomography: A remote-sensing technique that infers oceanic temperature, salinity and currents by measuring the travel times of sound pulses between transmitter–receiver pairs.
Sound speed profile (SSP): The vertical distribution of sound velocity in water, governed principally by temperature, salinity and pressure, which determines acoustic ray paths.
SOFAR channel: A horizontal region of minimal sound speed in the deep ocean that traps acoustic energy, enabling long-range propagation with low loss.
Tomographic inversion: The computational process of reconstructing spatial fields (e.g. temperature, currents) from measured acoustic travel times, often using regularisation to handle incomplete data.
References
- Global climatological dataset of undersea acoustic parameters derived from the NCEI World Ocean Atlas 2023. Scientific Data (2024).
- Effects of Dipole Eddies on Acoustic Propagation in the Northeastern South China Sea. Ocean-Land-Atmosphere Research (2025).
- The Effects of Sound Speed Profile to the Convergence Zone in Deep Water. Journal of Marine Science and Engineering (2022).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.