A revised 1000 year atmospheric δ13C‐CO2 record from Law Dome and South Pole, Antarctica
Open accessAbstract
We present new measurements of δ13C of CO2 extracted from a high‐resolution ice core from Law Dome (East Antarctica), together with firn measurements performed at Law Dome and South Pole, covering the last 150 years. Our analysis is motivated by the need to better understand the role and feedback of the carbon (C) cycle in climate change, by advances in measurement methods, and by apparent anomalies when comparing ice core and firn air δ13C records from Law Dome and South Pole. We demonstrate improved consistency between Law Dome ice, South Pole firn, and the Cape Grim (Tasmania) atmospheric δ13C data, providing evidence that our new record reliably extends direct atmospheric measurements back in time. We also show a revised version of early δ13C measurements covering the last 1000 years, with a mean preindustrial level of −6.50‰. Finally, we use a Kalman Filter Double Deconvolution to infer net natural CO2 fluxes between atmosphere, ocean, and land, which cause small δ13C deviations from the predominant anthropogenically induced δ13C decrease. The main features found from the previous δ13C record are confirmed, including the ocean as the dominant cause for the 1940 A.D. CO2 leveling. Our new record provides a solid basis for future investigation of the causes of decadal to centennial variations of the preindustrial atmospheric CO2 concentration. Those causes are of potential significance for predicting future CO2 levels and when attempting atmospheric verification of recent and future global carbon emission mitigation measures through Coupled Climate Carbon Cycle Models.
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The Antarctic ice record shows approximately constant CO2 and δ13C values continuing from 1200-1600 C.E.
“The Antarctic ice record shows approximately constant CO2 and δ 13 C values continuing from 1200 -1600 C.E. ( 69 ; Fig. 5B).”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [69]
The current rate of CO2 rise is 120 times faster than that at the start of the Holocene.
“120 times faster than that at the start of the Holocene.”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [69]
Atmospheric CO2 increased by ~120 ppm since ~1850 C.E.
“The striking change in atmospheric CO 2 concentrations is the ~120 ppm increase since ~1850 C.E. ( 69 ; Fig. 5B, C)”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [69]
The fall in δ13C atmospheric CO2 is due to an increase in 12C from burning fossil hydrocarbons.
“due to an increase in 12 C from burning fossil hydrocarbons.”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [69]
Atmospheric CO2 is rising at ~2 ppm/year over the past 50 years.
“rising at ~ 2 ppm/year over the past 50 years”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [69]
The steep fall (>2‰) of δ13C atmospheric CO2 to values ~8.5‰ coincides with the CO2 increase.
“This coincides with a steep fall (>2 ‰) of the δ 13 C atmospheric CO2 to values ~8.5 ‰ ( 69 ; Fig. 5C)”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [69]
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- Authors
- Rubino, M., Etheridge, D. M., Trudinger, C. M., Allison, C. E., Battle, M. O., Langenfelds, R. L., Steele, L. P., Curran, M., Bender, M., White, J. W. C., Jenk, T. M., Blunier, T., & Francey, R. J.
- Affiliations
- University of Copenhagen (DK)
- Commonwealth Scientific and Industrial Research Organisation (AU)
- Bowdoin College (US)
- Australian Antarctic Division (AU)
- Princeton University (US)
- Institute of Arctic and Alpine Research (US)
- ORCID
- Venue
- Journal of Geophysical Research Atmospheres
- Publisher
- American Geophysical Union (AGU)
- Published
- 2013-08-15
- Volume
- 118
- Issue
- 15
- Pages
- 8482-8499
- ISSN
- 0148-0227 (ISSN-L)
- 2169-897X
- 2169-8996
- OpenAlex
- W1608408893
- Cited by
- 238
- References
- 75
- Citations by year
- 2026: 11 · 2025: 11 · 2024: 27 · 2023: 17 · 2022: 13 · 2021: 20 · 2020: 24 · 2019: 30 · 2018: 16 · 2017: 27 · 2016: 20 · 2015: 12 · 2014: 9 · 2013: 1
- FWCI
- 9.11
- Type
- journal article
- Language
- en
- Open access
- green
- eprints.keele.ac.uk
- Locations
- Journal of Geophysical Research Atmospheres (publishedVersion)
- Keele Research Repository (Keele University) (submittedVersion, cc-by)
- eCite Digital Repository (University of Tasmania) (submittedVersion)
- Figshare (submittedVersion, cc-by)
- Archivio Istituzionale della Ricerca - Università degli Studi della Campania "Luigi Vanvitelli" (submittedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric and Environmental Gas Dynamics
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Keywords
- CO2 isotopes, ice core records, Law Dome, South Pole, firn air, carbon cycle, ocean CO2 flux, anthropogenic CO2, carbon-climate feedback, Cape Grim
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