ice tethered profiler (itp) moorings whoi principle investigators john toole rick krishfield andrey...
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Ice Tethered Profiler (ITP)Moorings
Ice Tethered Profiler (ITP)Moorings
WHOI Principle Investigators
John Toole
Rick Krishfield
Andrey Proshutinsky
WHOI Principle Investigators
John Toole
Rick Krishfield
Andrey Proshutinsky
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Goal: Document/understand interannual change through sustained observations of the
Arctic ice pack, the overlying atmosphere, and the upper ocean water properties
Ice-Based ObservatoriesIce-Based Observatories
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System SpecificationsSystem 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.
• 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.
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Ice-Tethered Profiler SchematicIce-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” holein the ice
Profile speed: .2 meters/sec. (2 hours RT)
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ITP Sensor Payload OptionsITP Sensor Payload Options
• CTD
• DO – Dissolved Oxygen
• MAVS – Modular Acoustic Velocity Sensor
• Biohead – PAR Sensor, Fluorometer
• CTD
• DO – Dissolved Oxygen
• MAVS – Modular Acoustic Velocity Sensor
• Biohead – PAR Sensor, Fluorometer
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Clamp on Inductive InstrumentsClamp on Inductive Instruments
• SAMI - PH
• SAMI (CO2) – CTD and PAR
• Microcat
• SAMI - PH
• SAMI (CO2) – CTD and PAR
• Microcat
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ITPDeployment Operations
ITPDeployment Operations
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Finding an Ice FloeFinding 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.
• 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.
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Ice Thickness SurveyIce Thickness Survey
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Set up on an ice floehelo assist
Set up on an ice floehelo assist
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Staging EquipmentStaging Equipment
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Set up deployment tripodSet up deployment tripod
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Drill ice holeDrill ice hole
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Ice holeIce hole
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Mooring anchorMooring anchor
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Start deployment with wire weightStart deployment with wire weight
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Wire payoutWire payout
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ITP installed on mooring wire
ITP installed on mooring wire
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Final Assembly of ITP electronics and mooringFinal Assembly of ITP electronics and mooring
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Electro / Mechanical Inductive Hose Assembly
Electro / Mechanical Inductive Hose Assembly
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Success!Success!
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Can an ITP be Recovered?Can an ITP be Recovered?
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Preferred Method - Smash it out! Preferred Method - Smash it out!
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Recovery of ITP 42Recovery of ITP 42
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ITP 36 Deployed 08/29/2009 at 79 12.7N, 125 42.3E on NABOS cruise. Found in Iceland 2/2012
ITP 36 Deployed 08/29/2009 at 79 12.7N, 125 42.3E on NABOS cruise. Found in Iceland 2/2012
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Data ExamplesData Examples
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Double-diffusive Staircase StratificationDouble-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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ITP1 Atlantic eddy profile ITP1 Atlantic eddy profile
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Expanded view of Atlantic water eddyExpanded view of Atlantic water eddy
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ITP3 engineering dataITP3 engineering data
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The End Thank You