Story: Climate change

Ice-core drilling

Ice-core drilling

Glaciers hold information about past climatic and environmental change. As snow accumulates, layer upon layer, year after year, it gradually turns to ice. The deepest part of the ice in glaciers and ice sheets may have fallen as snow thousands of years ago, and the particles locked in it form a record of earth's atmosphere at the time. In addition to trapping compounds from the air, ice sheets trap a small sample of the air itself, providing information about the composition of the atmosphere at the time the ice formed. These scientists are drilling core samples in Antarctica.

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How to cite this page:

Brett Mullan and Kynan Gentry, 'Climate change - Past climate', Te Ara - the Encyclopedia of New Zealand, (accessed 6 June 2020)

Story by Brett Mullan and Kynan Gentry, published 12 Jun 2006