Climate snapshots suggest carbon dioxide levels were surprisingly modest during ancient warm period
for Earth’s oldest ice. The ice opens a new window on Earth’s ancient climate—one that isn’t exactly what scientists expected.the Pliocene epoch, a time before the ice ages when the planet was several degrees warmer than today and carbon dioxide and leader of the U.S. Center for Oldest Ice Exploration , whichlast week here in multiple talks at the European Geosciences Union General Assembly. But if even a tiny drop in’t involved in the work.
folded. This mixes up the ice’s chronology: The oldest layers are not always deepest. If continuous ice cores are like books, blue ice cores are untitled chapters presented out of order, with lines missing.as old as 2.7 million years, including an analysis of greenhouse gases in air bubbles as old as 1.5 million years.
The greenhouse gas data also raise questions about a mysterious climate shift that began about 1.2 million years ago. At this time, something caused the ice ages to grow longer and more intense, stretching out from mild 40,000-year cycles to deeper 100,000-year cycles. The leading theory for this flip is that COreported in February,” Marks Peterson says. “That doesn’t mean there wasn’t one. But it might be smaller than we expected.”continuous core that covers the transition.
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