Climate of the Past
Climate of the Past
Climate of the Past
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https://doi.org/10.5194/cp-2021-113
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2021-113
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Preprints

  25 Aug 2021

25 Aug 2021

Review status: this preprint is currently under review for the journal CP.

Millennial variations of atmospheric CO2 during the early Holocene (11.7–7.4 ka)

Jinhwa Shin1,a, Jinho Ahn1, Jai Chowdhry Beeman2, Hun-Gyu Lee1, and Edward J. Brook3 Jinhwa Shin et al.
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  • 1School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Republic of Korea
  • 2Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
  • 3College of Earth, Oceanic, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331-5506, U.S.A.
  • acurrent address: Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, T6G 2E3, Canada
Received: 18 Aug 2021 – Accepted for review: 19 Aug 2021 – Discussion started: 25 Aug 2021

Abstract. We present a new high-resolution record of atmospheric CO2 from the Siple Dome ice core, Antarctica over the early Holocene (11.7–7.4 ka) that quantifies natural CO2 variability on millennial timescales under interglacial climate conditions. Atmospheric CO2 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 CO2 by changing CO2 outgassing from the Southern Ocean and the East Equatorial Pacific and terrestrial carbon storage in the Northern Hemisphere over the early Holocene.

How to cite. Shin, J., Ahn, J., Chowdhry Beeman, J., Lee, H.-G., and Brook, E. J.: Millennial variations of atmospheric CO2 during the early Holocene (11.7–7.4 ka), Clim. Past Discuss. [preprint], https://doi.org/10.5194/cp-2021-113, in review, 2021.

Jinhwa Shin et al.

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Short summary
We present a new and highly resolved atmospheric CO2 record from Siple Dome ice core, Antarctica over the early Holocene (11.7 ka–7.4 ka). Atmospheric CO2 decreased by ~10 ppm from 10.9 to 7.3 ka but the decrease was punctuated by local minima at 11.1, 10.1, 9.1 and 8.3 ka. We found millennial CO2 variability of 2–6 ppm and the millennial CO2 variations correlate with proxies for solar forcing and local climate in the Southern Ocean, North Atlantic and the eastern equatorial Pacific.
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