sediments piled up along its outermost edge. Using the sediment core, the researchers discovered that the ice sheet formed in two stages.
Sedimentary story
Researchers gleaned new insights about the Antarctic ice sheet’s origins using a sediment core collected in the Ross Sea off the coast of East Antarctica,
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. The roughly 900-meter-long core offered clues about the stability of the early ice sheet at different levels of atmospheric carbon dioxide.

When CO2 levels fell below 750 ppm and the Antarctic ice first appeared 34 million years ago, the ice sheet was small and only on land, the researchers found. Susceptible to fluctuations in the amount of solar heat that warmed Earth,
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, this early ice sheet underwent large-scale changes in size.
Once CO2 dropped below 600 ppm around 32.8 million years ago,
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, the ice sheet became more resilient to climate change,
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, expanded in size and lowered sea levels. If CO2 levels once again rise above 600 ppm, the Antarctic ice sheet will again become vulnerable to rapid melting,
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, the researchers warn.
“As we go forward to a warmer world,
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, we’re essentially running this in reverse,” says Thomas Wagner, a cryosphere scientist at NASA headquarters in Washington,
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, D.C.,
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, who was not involved in the research. “This work shows us what the world looked like back then that we’re now heading toward

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