IMOS - Deep Water Moorings - Deep Water Arrays (DA) Sub-facility, Totten array, Totten3 Mooring Platform

Research Project

Researchers: CSIRO Oceans & Atmosphere - Hobart (Associated with) ,  Data Officer (Point of contact, Distributes) ,  Integrated Marine Observing System (IMOS) (Resource provider of, Associated with) ,  Sloyan, Bernadette (principalInvestigator)

Full description It is one of three deepwater moorings located off the Adelie Land Coast in Antarctica. These moorings comprise the Totten Polynya Array, a one-year pilot deployment in 2014/2015.

The Totten3 (Totten region) deepwater mooring was deployed on 2014-03-05 at (-66.50 S, 120.46 E) off the Adelie Land Coast in Antarctica, and was decommissioned/recovered in January 2015.

Instrumentation includes 75kHz Acoustic Doppler Current Profilers (RDI longranger ADCPs), and Seabird SBE37s (SM and SMP-ODO).

The mooring will collect a time series of full-depth profiles of water velocity and discrete temperature and salinity measurement at four depth on each mooring, between the seafloor and 300m depth (the mooring are limited to this depth to avoid contact with icebergs).

The aim of the IMOS Mertz and Totten Polynya mooring array is to measure the export of dense Antarctic Bottom Water from the Adélie Land coast. Sinking of dense water near Antarctica supplies the deep branch of the global overturning circulation, a pattern of ocean currents that strongly influences climate. Several studies have recently shown that the properties of the bottom water in the Australian Antarctic Basin are changing. Monitoring the temperature, salinity and oxygen of bottom water will provide observations to detect how the Southern Ocean limb of the overturning circulation is responding to changes in high latitude climate forcing. The goal of the new Totten region location is to obtain measurements of "warm" inflow to, and (if possible) outflow from the Totten Glacier system. As it happened, access right to the Totten was not possible, and moorings were sited closer to the Dalton Iceberg Tongue and Moscow University Ice Shelf, possibly part of the Totten inflow story.

Lineage Maintenance and Update Frequency: asNeeded

Notes Credit
Australia’s Integrated Marine Observing System (IMOS) is enabled by the National Collaborative Research Infrastructure Strategy (NCRIS). It is operated by a consortium of institutions as an unincorporated joint venture, with the University of Tasmania as Lead Agent.

Data time period: 2014-02-04 to 2015-01-03

120.46,-66.5

120.46,-66.5

text: westlimit=120.46; southlimit=-66.50; eastlimit=120.46; northlimit=-66.50

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