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Calcium isotope ratios of malformed foraminifera reveal biocalcification stress preceded Oceanic Anoxic Event 2

Earth Sciences

Calcium isotope ratios of malformed foraminifera reveal biocalcification stress preceded Oceanic Anoxic Event 2

G. D. Kitch, A. D. Jacobson, et al.

This groundbreaking study reveals how ocean acidification triggered biocalcification stress in planktic foraminifera during the Cretaceous Ocean Anoxic Event 2. Researchers from Northwestern University and the University of Urbino explore critical calcium isotope shifts and their implications for understanding past climate events and developing ocean alkalinity enhancement strategies.

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Playback language: English
Abstract
Ocean acidification causes biocalcification stress. This study synthesizes morphometric observations of planktic foraminifera with multi-archive calcium isotope records from Gubbio, Italy and the Western Interior Seaway spanning Cretaceous Ocean Anoxic Event 2 (-94 million years ago). Calcium isotope ratios increased ~60 thousand years prior to the event, coinciding with foraminiferal abnormalities and correlating with existing proxy records for carbon dioxide release during large igneous province volcanism. Decreasing calcium isotope ratios during the event indicate ocean alkalinization, potentially shifting air-sea carbon dioxide partitioning and explaining the Plenus Cold Event. These findings offer implications for refining ocean alkalinity enhancement strategies.
Publisher
Communications Earth & Environment
Published On
Dec 13, 2022
Authors
Gabriella D. Kitch, Andrew D. Jacobson, Bradley B. Sageman, Rodolfo Coccioni, Tia Chung-Swanson, Meagan E. Ankney, Matthew T. Hurtgen
Tags
ocean acidification
biocalcification stress
planktic foraminifera
calcium isotopes
Cretaceous Ocean Anoxic Event
carbon dioxide release
ocean alkalinity

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