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Sea ice under scrutiny from space


Media Release,
20 September 2007

Sea ice under scrutiny from space

Lasers from helicopters and space satellites are being used in Antarctica, for the first time, to determine whether sea ice in the Southern Ocean is changing in response to climate change.

Sea ice plays an essential role in regulating global climate as well as supporting the Southern Ocean ecosystem, and there are concerns that Antarctic sea ice may be getting thinner.

A team of international researchers, led by the Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC), is on a six-week expedition in the Southern Ocean aboard the Antarctic research ship Aurora Australis, which left Hobart earlier this month.

Two helicopters equipped with laser altimeters are taking measurements of sea ice thickness. These will be tested against satellite-based measurements, taken as part of a separate US National Aeronautics and Space Administration (NASA) ICESat science project.

The ultimate aim of the helicopter altimetry, combined with surface measurements taken by scientists on the ice, is to help validate measurements from satellites. These can then be used to estimate Antarctic sea ice thickness over large areas.

Voyage leader Dr Tony Worby said that to date relatively few measurements of Antarctic sea ice thickness have been made, meaning that any variations related to recent climate change may have been going unnoticed.

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