Instrumentation

The moorings are at the CSIRO mooring workshop, Hobart. This group is internationally recognised for manufacturing moorings that can withstand intensive dynamically ocean forcing (INSTANT, IMOS ITF and EAC mooring arrays) and harsh environmental conditions (Polynya – Antarctic continental shelf moorings). The mooring team are involved in the design, manufacture and recovery and re-deployment of the mooring array. Adequate spare instruments and parts will be carried on the voyages to enable the replacement and or refurbishment of instruments to ensure the successful redeployment of the complete mooring array.

Mertz and Totten Polynya Arrays

The three moorings in both the Mertz and Totten Polynya Arrays have sensors located at four depths between 300m and the sea floor.  Sensors were not positioned higher in the water column on these moorings to avoid any potentially damaging contact with icebergs.  The sensors collect a time-series of full-depth profiles of water velocity and discrete temperature and salinity measurements. The mooring include a TOGS retrievable compass system. The TOGS system allows scientists to determine the landing orientation of the three time-series sensor (current, temperature and salinity) moorings, and thus to determine current direction as well as magnitude.

To download more detail of all Polynya and Totten mooring schematics please click here.

Indonesian Throughflow (ITF) Array

The three moorings in the Indonesian Throughflow (ITF) Array are conventional subsurface tall moorings with upward and downward looking Acoustic Doppler Current Profilers (ADCP), combined with point source velocity, temperature and salinity sensors.

The instruments will provide a time series of temperature, salinity and velocity at 10 to 30 minute periods.  A mixture of 75 kHz, 150 kHz, and 300 kHz ADCPs will provide velocity at 7 m to 32 m vertical resolution in the upper 700 m in the Timor Passage and 1200 m in Ombai Strait.  Below 700 m point source ADCPs will provide velocity data to the controlling sill depth (1200 m) in Timor Passage.  Discrete temperature and salinity data will be collected on all mooring using SBE37 and SBE39 instruments.

To download more detail of all ITF mooring schematics please click here.

East Australian Current (EAC) Array

The six moorings in the East Australian Current (EAC) Array include temperature, conductivity and depth sensors and an array of full-depth current meters. A mixture of 75 kHz, 150 kHz, and 300 kHz ADCPs provide velocity at 7 m to 32 m vertical resolution in the upper 1000 m of the EAC.  Below 1000 m point source ADCPs will provide velocity data to the sea floor at varying vertical resolution.  Discrete temperature and salinity data are collected on all mooring using SBE37 and SBE39 and Starmon Mini temperature instruments. To download more detail of EAC moorings please click here.

 

 

Schematic of the EAC 2015 deployment and depth of instrument.