The SeaCat system has been supplied by one of our Science Advisors, Professor Tim Stanton at the Naval Postgraduate School in Monterey, California. It consists of an ultra light weight winch system and a high resolution Conductivity Temperature Depth sensor package (CTD) made by Sea Bird Electronics.

Taking Measurements From The Ice

After a small hole is made in the ice (Using the Mora Ice Drill) this CTD is lowered from just under the ice to a depth of 300m at about 0.5 m/s, and samples conductivity, temperature and depth 4 times a second, and records this within the package, allowing the data to be downloaded later to the Onboard Sledge Computer. The measurements are made to a very high accuracy allowing temperature, for example, to be measured to less than 1/1000 of a degree C.

The conductivity, depth and temperature can be combined through a complicated equation based on lab experiments to derive salinity. Temperature and depth allow the water density to be determined. As the vertical CTD profiles are made across the Arctic Basin, the regional changes of these ocean properties will be analyzed. We can, for example, look at the heat available for melting ice, and compare that with high resolution regional ocean models.

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Sprite gallery, photos of team and expedition.

"Technology" Blog Posts
And they are off
Posted by Ian Wesley
A big day today and spirits were high. After a prolonged packing session the Ice Team are out on the ice for their first mini expedition together. They left with sleds packed high and bristling with antennas....more
Friday, 16th January 2009

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