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Glossary

The English version of our glossary is currently under construction and will be regularly updated.

Oceanography

The science of the ocean.

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ODS

Ozone-depleting substance.

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Old ice

Sea ice that has survived at least one summer melting.

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Old snow

Deposited snow; the ice crystals’ original form can no longer be recognised. 

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Opacity

The degree to which a given substance can be penetrated by light or electromagnetic waves.

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Open water

A large, freely navigable water zone that is nearly ice-free. The ice concentration is less than 1/10.

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Osmotic pressure

The pressure between two fluids with different concentrations that are separated by a semipermeable membrane.

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Ozone

A gaseous component of the atmosphere.

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Ozone layer

A layer spanning from ca. 12 to 40 km above the Earth’s surface.

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