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Argonne National Laboratory
Using krypton gas to date the age of ancient ice cores
Using krypton gas to date the age of ancient ice cores

Scientists say they have developed a means of accurately dating Earth's oldest and densest polar ice by analyzing the composition of krypton gas trapped within ancient air bubbles. In a study published Monday in the journal PNAS, researchers used the new dating method, called Atom Trap Trace Analysis, or ATTA, to study ice recovered from the McMurdo Dry Valleys in Antarctica. "The oldest ice found in drilled cores is around 800,000 years old, and with this new technique we think we can look in other regions and successfully date polar ice back as far as 1.5 million years," lead study author Christo Buizert, an Oregon State University paleoclimatologist, said in a statement. "That is...

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