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Continuous sterane and phytane δ13C record reveals a substantial pCO2 decline since the mid-Miocene
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DOI：10.1038/s41467-024-47676-9.png)
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Abstract
En 中文
Constraining the relationship between temperature and atmospheric concentrations of carbon dioxide (pCO(2)) is essential to model near-future climate. Here, we reconstruct pCO(2) values over the past 15 million years (Myr), providing a series of analogues for possible near-future temperatures and pCO(2), from a single continuous site (DSDP Site 467, California coast). We reconstruct pCO(2) values using sterane and phytane, compounds that many phytoplankton produce and then become fossilised in sediment. From 15.0-0.3 Myr ago, our reconstructed pCO(2) values steadily decline from 650 +/- 150 to 280 +/- 75 ppmv, mirroring global temperature decline. Using our new range of pCO(2) values, we calculate average Earth system sensitivity and equilibrium climate sensitivity, resulting in 13.9 degrees C and 7.2 degrees C per doubling of pCO(2), respectively. These values are significantly higher than IPCC global warming estimations, consistent or higher than some recent state-of-the-art climate models, and consistent with other proxy-based estimates.
Keywords:
CARBON-ISOTOPE FRACTIONATION
ORGANIC-MATTER
GROWTH-RATE
CLIMATE SENSITIVITY
SURFACE-WATER
ALGAL LIPIDS
OCEAN
PHYTOPLANKTON
C-13
SEDIMENTS
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