The Upward Looking Sonar is the topmost instrument on the mooring. It records the ice draft, or depth below the water surface of the bottom of the ice drifting overhead. Closely linked mathematically to ice thickness, changes in the mean ice draft are major indicators of climate change. Ice draft measurements from cold War-era submarines indicate a persistent thinning of the Arctic ice cover over the past 40 years.

Temperature and Salinity time series

Plotted here are time series of temperature and salinity from one level on the 2001-2001 mooring.   At a nominal 110 meters, a Seabird Electronics SBE-16 recorded temperature, conductivity, and pressure, the combination enabling the salinity to be calculated.  The mooring is not rigid, and there are instances when a particularly strong current pulled down the mooring to make the depths of each instrument deeper than design.

Data from the 2001-2002 mooring year may be obtained via FTP at this website.