Glaciologist with Vostok ice cores in storage

Glaciologist with Vostok ice cores in storage

E220/0023

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Caption

Vostok ice cores. Glaciologist with stored ice cores drilled at Vostok, Antarctica. Used in climate research, the cores were taken by drilling into ice formed from successive layers of snow over thousands of years. These cores, stored at -15 to -20 degrees Celsius, contain tiny bubbles of air which were trapped as snow fell. The deeper the ice, the older the air. Examination of the exact composition of the air in slices of the core reveal details of the climate at the time the air was trapped. The deepest ice was 3350 metres deep and 400,000 years old. Photograph of Jean Robert Petit of the Laboratory of Glaciology and Geophysics in Grenoble, France.

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