Millennial variations in atmospheric CO 2 during the early Holocene (11.7–7.4 ka)

International audience We present a new high-resolution record of atmospheric CO 2 from the Siple Dome ice core, Antarctica, over the early Holocene (11.7-7.4 ka) that quantifies natural CO 2 variability on millennial timescales under interglacial climate conditions. Atmospheric CO 2 decreased by ∼...

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Bibliographic Details
Published in:Climate of the Past
Main Authors: Shin, Jinhwa, Ahn, Jinho, Chowdhry Beeman, Jai, Lee, Hun-Gyu, Seo, Jaemyeong Mango, Brook, Edward
Other Authors: Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2022
Subjects:
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
Antarc*
Antarctica
ice core
North Atlantic
Online Access:https://hal.science/hal-03776661
https://hal.science/hal-03776661/document
https://hal.science/hal-03776661/file/cp-18-2063-2022.pdf
https://doi.org/10.5194/cp-18-2063-2022
Description
Summary:International audience We present a new high-resolution record of atmospheric CO 2 from the Siple Dome ice core, Antarctica, over the early Holocene (11.7-7.4 ka) that quantifies natural CO 2 variability on millennial timescales under interglacial climate conditions. Atmospheric CO 2 decreased by ∼ 10 ppm between 11.3 and 7.3 ka. The decrease was punctuated by local minima at 11.1, 10.1, 9.1, and 8.3 ka with an amplitude of 2-4 ppm. Although the explanations of carbon cycle mechanisms remain uncertain due to insufficient paleoclimate records and model simulations, these variations correlate with proxies for solar forcing and local climate in the southeast Atlantic polar front, eastern equatorial Pacific, and North Atlantic. Additional CO 2 measurements using betterquality ice cores and carbon cycle models are needed to confirm the observation.

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