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CryoSat-2: Mesuring ice thickness from orbit

 © ESA

  • Cryosat’s radar has the resolution to see the Arctic’s floes and leads

  • Some 7/8ths of the ice tends to sit below the waterline - the draft

  • The aim is to measure the freeboard - the ice part above the waterline

  • Knowing this 1/8th figure allows Cryosat to work out sea ice thickness