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
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
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.
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)
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
Clamp on Inductive InstrumentsClamp on Inductive Instruments
• SAMI - PH
• SAMI (CO2) – CTD and PAR
• Microcat
• SAMI - PH
• SAMI (CO2) – CTD and PAR
• Microcat
ITPDeployment Operations
ITPDeployment Operations
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.
Ice Thickness SurveyIce Thickness Survey
Set up on an ice floehelo assist
Set up on an ice floehelo assist
Staging EquipmentStaging Equipment
Set up deployment tripodSet up deployment tripod
Drill ice holeDrill ice hole
Ice holeIce hole
Mooring anchorMooring anchor
Start deployment with wire weightStart deployment with wire weight
Wire payoutWire payout
ITP installed on mooring wire
ITP installed on mooring wire
Final Assembly of ITP electronics and mooringFinal Assembly of ITP electronics and mooring
Electro / Mechanical Inductive Hose Assembly
Electro / Mechanical Inductive Hose Assembly
Success!Success!
Can an ITP be Recovered?Can an ITP be Recovered?
Preferred Method - Smash it out! Preferred Method - Smash it out!
Recovery of ITP 42Recovery of ITP 42
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
Data ExamplesData Examples
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.
ITP1 Atlantic eddy profile ITP1 Atlantic eddy profile
Expanded view of Atlantic water eddyExpanded view of Atlantic water eddy
ITP3 engineering dataITP3 engineering data
The End Thank You