Radarsat will supply scientists with hard data on how much ice is lost or gained each year.

CNN: Nature - Satellite sees through Arctic ice for signs of climate change

While Radarsat sensors cannot measure the thickness of ice already present, it is able to measure seasonal ice that is produced or lost each year.

CNN: Nature - Satellite sees through Arctic ice for signs of climate change

This information has been provided by Radarsat, a Canadian satellite capable of detecting detailed water and land features through thick clouds, fog and rain using synthetic-aperture radar equipment.

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