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Ice Tethered Profiler (ITP) Moorings

Ice Tethered Profiler (ITP) Moorings. WHOI Principle Investigators John Toole Rick Krishfield Andrey Proshutinsky. Ice-Based Observatories. Goal: Document/understand interannual change through sustained observations of the Arctic ice pack, the overlying atmosphere,

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Ice Tethered Profiler (ITP) Moorings

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  1. Ice Tethered Profiler (ITP)Moorings WHOI Principle Investigators John Toole Rick Krishfield Andrey Proshutinsky

  2. Ice-Based Observatories Goal: Document/understand interannual change through sustained observations of the Arctic ice pack, the overlying atmosphere, and the upper ocean water properties

  3. System Specifications • Capable of returning in real time, high accuracy daily (or semi daily) temperature and salinity profiles to 750m depth for 2 years. • Deployable from light aircraft and/or helicopters through a conventional 10.5” (.26 m) ice-augured hole. • Modestly priced, allowing them to be deployed in large numbers and be considered expendable. • Capable of supporting plug-in modules for additional surface and/or subsurface instrumentation.

  4. Ice-Tethered Profiler Schematic Profiling Interval: 10m - 800 m or less Profiling range: 1,500,000 m Duration: 2.5- 3 years at one profile / day Temperature specification: -35° C Data telemetry: up to 50 kbytes / day Sensors: Seabird 41-CP CTD (same as ARGO floats) Telemetry: Seabird inductive link from profiler to surface unit; Iridium link to shore Power: lithium “DD” battery packs Size: Profiler fits through an 10.5” hole in the ice Profile speed: .2 meters/sec. (2 hours RT)

  5. ITP Sensor Payload Options • CTD • DO – Dissolved Oxygen • MAVS – Modular Acoustic Velocity Sensor • Biohead – PAR Sensor, Fluorometer

  6. Clamp on Inductive Instruments • SAMI - PH • SAMI (CO2) – CTD and PAR • Microcat

  7. ITPDeployment Operations

  8. Finding an Ice Floe • Multi year preferred 1.5 – 4.5 meters thick. • Medium height ice ridges surrounding the site for protection • Few cracks. • If a suitable ice floe can’t be located, ITP system can be deployed in open water.

  9. Ice Thickness Survey

  10. Set up on an ice floehelo assist

  11. Staging Equipment

  12. Set up deployment tripod

  13. Drill ice hole

  14. Ice hole

  15. Mooring anchor

  16. Start deployment with wire weight

  17. Wire payout

  18. ITP installed on mooring wire

  19. Final Assembly of ITP electronics and mooring

  20. Electro / Mechanical Inductive Hose Assembly

  21. Success!

  22. Can an ITP be Recovered?

  23. Preferred Method - Smash it out!

  24. Recovery of ITP 42

  25. ITP 36 Deployed 08/29/2009 at 79 12.7N, 125 42.3E on NABOS cruise. Found in Iceland 2/2012

  26. Data Examples

  27. Double-diffusive Staircase Stratification Expanded views of the potential temperature profiles and potential temperature - salinity diagrams. Above the Atlantic Layer, temperature and salinity both decrease with height: a stratification subject to the diffusive layering form of double diffusion that is manifested by the staircase profile resolved by the ITP (left). Over plotted potential temperature-salinity curves at the level of the Atlantic Layer (right) clearly document intrusions that erode this warm salty water mass.

  28. ITP1 Atlantic eddy profile

  29. Expanded view of Atlantic water eddy

  30. ITP3 engineering data

  31. The End Thank You

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