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Northwestern Now Shelled organisms helped buffer ocean acidification by consuming less alkalinity from seawater Gabriella Kitch works with samples from an ocean sediment core. Microscopic fossilized shells are helping geologists reconstruct Earth’s climate during the Paleocene-Eocene Thermal Maximum (PETM), a period of abrupt global warming and ocean acidification that occurred 56 million years ago. Clues from these ancient shells can help scientists better predict future warming and ocean acidification driven by human-caused carbon dioxide emissions.  Led by Northwestern University, the researchers analyzed shells from foraminifera, an ocean-dwelling unicellular organism with an external shell made of calcium carbonate. After analyzing the calcium isotope composition of the fossils, the researchers concluded that massive volcanic activity injected large amounts of carbon dioxide into the Earth system, causing global warming and ocean acidification. 

United statesAtlantic oceanAndrew jacobsonBradley sagemanPacific oceanMatthew hurtgenUniversity of kansasUniversity of californiaOcean drilling programNorthwestern weinberg college of artsNational science foundationNorthwestern universityPaleocene eocene thermal maximumGabriella kitchWeinberg collegeCalifornia santa cruz