Dating ice core methods

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Comments 2

himward

8/16/2019

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apolysis

8/21/2019

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Australian Antarctic Division: Leading Australia’s Antarctic Program

I was wondering how ice cores are dated accurately. I know Carbon 14 is one method, but some ice cores go back hundreds of thousands of years. Would other isotopes with longer half-lives be more accurate? Also, how much does it cost to date the core? How are samples acquired without destroying the ice? I imagine keeping the ice intact as much as possible would be extremely valuable. Some of the answers to these questions are available on the Ice Core Basics page. Ice cores can be dated using counting of annual layers in their uppermost layers. Dating the ice becomes harder with depth. Usually multiple methods are used to improve accuracy.

A variety of methods are used to date an ice core. The most direct method is to count annual layers in much the same way that tree-rings can be counted to determine the age of the tree. However, the layers in ice cores are not generally visible in the ice. They only become apparent when the core is analysed for a chemical signal that varies with the seasons, which most signals do, to some extent. In fact the clearest dating is obtained when several seasonal signals are examined and compared.

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Ice consists of water molecules made of atoms that come in versions with slightly different mass, so-called isotopes. Variations in the abundance of the heavy isotopes relative to the most common isotopes can be measured and are found to reflect the temperature variations through the year. The graph below shows how the isotopes correlate with the local temperature over a few years in the early s at the GRIP drill site:. The dashed lines indicate the winter layers and define the annual layers.

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How are ice cores dated?

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