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
The Polar Woodpecker
Posted by Dominic Hilton
Manual drilling takes CAS expedition leader Pen Hadow approximately four hours a day. He’s developed a routine of heading out from the tent in the early evening......more
Thursday, 16th April 2009
Team turns to traditional survey methods as technology battles force of nature
Posted by Dominic Hilton
The Catlin Arctic Survey has now released its first set of ice and snow thickness measurements, showing the floating sea ice cover it has travelled over in the early stage is predominantly new ice......more
Wednesday, 15th April 2009
Muscle Immobilisation
Posted by Dr Craig McLean
The effects of lying on your back inside a frozen tent for 5 days awaiting resupply has grave effects on mental and physical wellbeing....more
Saturday, 21st March 2009
Perran on Power Supplies for the expedition
Posted by Perran Newman
Traditional polar expeditions have a modest power requirement that is usually met using a combination of primary (non rechargeable) Lithium batteries and seconday batteries recharged.....more
Friday, 20th March 2009
Chivalry on the ice
Posted by Ann Daniels
Before the re-supply, all I could think of was The Re-Supply. Now that it’s been and gone of course, my mind is onto the next thing!...more
Friday, 20th March 2009
Department for International Development Conference
Posted by Rod Macrae
Today Pen addressed the DFID conference on development and was interviewed by satellite phone live from the ice by the Secretary of State for International Development Douglas Alexander....more
Monday, 09th March 2009
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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