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Ocean Reference Time-Series Moorings: Acoustics

Facilitating information exchange on time-series mooring and acoustical oceanography for network development. Focus on ALOHA Observatory mooring, ATOC plans, marine life sampling, and sensor network adaptive sampling. Plans for additional sensors, moorings, and expanding efforts in the North Pacific region. Integration of various acoustic approaches and building a coherent measurement program. Planning for acoustic network sites considering ocean signals, sound speed structure, and sharing interdisciplinary nature.

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Ocean Reference Time-Series Moorings: Acoustics

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  1. Ocean Reference Time-Series Moorings: Acoustics By Bruce M. Howe Applied Physics Laboratory, University of Washington Reference Time-Series Science Team Meeting 3-5 April 2003

  2. Outline • My purpose here – facilitate information exchange - ref time series mooring and acoustical oceanography, network • Science rationale - acoustics • Proposed ALOHA Observatory mooring – one step in development • More plans in North Pacific - ATOC • Acoustical oceanography planning efforts • Concluding remarks

  3. Scientific Rationales • Ocean circulation and variability over wide range of spatial and temporal scales • Small, mesoscale, climate/basin • Physical properties – temperature, velocity, … • Sampling – Nyquist, physical access, … • Surface fluxes – wind/gas/bubbles and rain • Marine life • micro to mega fauna • basics to behavior • T-phases • Other …

  4. ALOHA Mooring Sensor Network and Adaptive Sampling • NSF proposal • submitted 6 March 2003 – SENSORS program • With Roger Lukas and Emmanuel Boss • Use MMP with bio-optics to adaptively sample water column • Attach EOM subsurface mooring to ALOHA Observatory (AO) • Includes EOM cable, MMP docking • J-boxes on subsurface float and at base – power, comms • Upward looking ADCP on subsurface float • Learn how to zero in on features of interest – real-time comms • Fulfill time series requirements

  5. ALOHA Observatory MooringNSF ProposalMarch 2003

  6. ALOHA Mooring Sensor Network:Next steps • Add more bio-optical and other sensors • Add winched profiler for upper 200 m • ROV serviceable • Another EOM mooring with fixed sensors (e.g., tomography, acoustic rain, wind, gas transfer, T-phase, marine animals) • Other nearby sensors (e.g., IES, HEF, BBL ADCP/T-S, bottom rovers, …) • Work towards a coherent measurement program at AO: HOT, MOSEAN, Weller NOAA, etc.

  7. Other North Pacific Efforts • H2O (mid-way Hawaii – California) • add acoustic/tomography mooring(s) • Is there interest in a reference time series site there or planned? • MARS – Monterey Accelerated Research System • Acoustic receiving array – ATOC, Calif current • Eventually acoustic source • PAPA – NOPP/ATOC demonstration • NPAL • upcoming experiment, long term Navy interest • Continues ATOC – see last CLIVAR newsletter

  8. Present ATOC Array

  9. Present Time seriesMarch 20030-1000 m Temp

  10. Present Time seriesMarch 2003travel times – measured and ECCO

  11. Acoustic approaches - 1 Simultaneously: • Acoustic navigation - Underwater GPS • Acoustic communications • Acoustical oceanography  Nested infrastructure of broadband transmitters + receivers + … Other …

  12. Acoustic approaches - 2 • Platform navigation with passive hydrophone receivers • Better float information (velocity, deep, …) • Track auvs, gliders, rovers, animals • Acoustic tomography – fixed s/r, moving r • Acoustic comms – when satellite comms not an option • The acoustic spectrum Other …

  13. Acoustic network sites Need to start planning • A fair degree of flexibility in location • Ocean signals of interest • Bathymetry blocking • Ocean sound speed structure, noise, logistics, etc. • Sharing/interdisciplinary nature is essential – DEOS, RefTimeSeries, etc

  14. GEO, DEOS, et al.

  15. ASA AO CommitteeIntegrated Acoustics Systems for Ocean Observations • Web page – AO • Co-chairs – Bruce Howe, Jim Miller • White paper in preparation • Workshop • 19-20 Sep 2003 San Diego (tentative) • Lead to • Contribute to OOI workshop 5-9 Jan 2004 • Acceptance by CLIVAR, GOOS, etc.

  16. Concluding remarks • See acoustics as one link connecting point and spatial measurements • Address siting issues – with other interdisciplinary users • Must work towards synergies – science, technology, programs

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