Carbon isotope constraints on the deglacial CO2 rise from ice cores

The stable carbon isotope ratio of atmospheric CO2 (δ13Catm) is a key parameter in deciphering past carbon cycle changes. Here we present δ13Catm data for the past 24,000 years derived from three independent records from two Antarctic ice cores. We conclude that a pronounced 0.3 per mil decrease in...

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Bibliographic Details
Published in:Science
Main Authors: Schmitt, Jochen, Schneider, Robert, Elsig, Joachim, Leuenberger, Daiana, Lourantou, Anna, Chappellaz, Jerome, Koehler, Peter, Joos, Fortunat, Stocker, Thomas F., Leuenberger, Markus, Fischer, Hubertus
Format: Text
Language:unknown
Published: Washington, American Association for the Advancement of Science (AAAS) 2022
Subjects:
Antarctic
Southern Ocean
Antarc*
Online Access:https://doi.org/10.1126/science.1217161
http://infoscience.epfl.ch/record/298287
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Summary:The stable carbon isotope ratio of atmospheric CO2 (δ13Catm) is a key parameter in deciphering past carbon cycle changes. Here we present δ13Catm data for the past 24,000 years derived from three independent records from two Antarctic ice cores. We conclude that a pronounced 0.3 per mil decrease in δ13Catm during the early deglaciation can be best explained by upwelling of old, carbon-enriched waters in the Southern Ocean. Later in the deglaciation, regrowth of the terrestrial biosphere, changes in sea surface temperature, and ocean circulation governed the δ 13Catmevolution. During the Last Glacial Maximum, δ13Catm and atmospheric CO2 concentration were essentially constant, which suggests that the carbon cycle was in dynamic equilibrium and that the net transfer of carbon to the deep ocean had occurred before then.

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