Open access. As a result, the amount of ice in the high-latitudes plays an important role in regulating the delta-O value. An important method for the study of long-term climate change involves isotope geochemistry. Ice cores from Greenland or Antarctica are often layered, and the layers can be counted to determine age.
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Therefore, in warmer climates when glaciers melt, they release the 16 O that is trapped in them, and the oceans become enriched in 16 O.