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

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...

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Bibliographic Details
Published in:Climate of the Past
Main Authors: J. Shin, J. Ahn, J. Chowdhry Beeman, H.-G. Lee, J. M. Seo, E. J. Brook
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2022
Subjects:
Environmental pollution
TD172-193.5
Environmental protection
TD169-171.8
Environmental sciences
GE1-350
Pacific
Siple
Siple Dome
Antarc*
Antarctica
ice core
North Atlantic
Online Access:https://doi.org/10.5194/cp-18-2063-2022
https://doaj.org/article/033e89919070428da3887f4286f127f3
Description
Summary: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 better-quality ice cores and carbon cycle models are needed to confirm the observation.

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