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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

Ice Tethered Profiler (ITP)Moorings

WHOI Principle Investigators

John Toole

Rick Krishfield

Andrey Proshutinsky

ice based observatories
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

system specifications
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.
ice tethered profiler schematic
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)

itp sensor payload options
ITP Sensor Payload Options
  • CTD
  • DO – Dissolved Oxygen
  • MAVS – Modular Acoustic Velocity Sensor
  • Biohead – PAR Sensor, Fluorometer
clamp on inductive instruments
Clamp on Inductive Instruments
  • SAMI - PH
  • SAMI (CO2) – CTD and PAR
  • Microcat
finding an ice floe
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.
double diffusive staircase stratification
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.

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The End

Thank You

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