Millennial variations of atmospheric CO2 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 7...

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Bibliographic Details
Main Authors: Shin, Jinhwa, Ahn, Jinho, Chowdhry Beeman, Jai, Lee, Hun-Gyu, Brook, Edward J.
Format: Text
Language:English
Published: 2021
Subjects:
Pacific
Siple
Siple Dome
Southern Ocean
Antarc*
Antarctica
ice core
North Atlantic
Online Access:https://doi.org/10.5194/cp-2021-113
https://cp.copernicus.org/preprints/cp-2021-113/
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 amplitude of 2–6 ppm. These variations correlate with proxies for solar forcing and local climate in the South East Atlantic polar front, East Equatorial Pacific and North Atlantic. These relationships suggest that weak solar forcing changes might have impacted CO 2 by changing CO 2 outgassing from the Southern Ocean and the East Equatorial Pacific and terrestrial carbon storage in the Northern Hemisphere over the early Holocene.

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