Antarctic Ice Cores Revised 800KYr CO2 Data
World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program
NOTE: Please cite Publication, and Online_Resource and date accessed when using these data.
If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed.
Online_Resource: http://ncdc.noaa.gov/paleo/study/17975
Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2edc.txt
Description/Documentation lines begin with
Data lines have no
Archive: Ice Cores
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Contribution_Date
Date: 2015-02-04
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Title
Study_Name: Antarctic Ice Cores Revised 800KYr CO2 Data
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Investigators
Investigators: Bereiter, B.; Eggleston, S.; Schmitt, J.; Nehrbass-Ahles, C.; Stocker, T.F.; Fischer, H.; Kipfstuhl, S.; Chappellaz, J.
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Description_and_Notes
Description: Revised EPICA Dome C and Antarctic composite ice core atmospheric CO2 data. This new version of CO2 composite
replaces the old version of Luthi et al. (2008), which contains the analytical bias described in Bereiter et al. 2015
and lower quality data in other sections. For details about the improvements relative to the previous version see supplementary
information of Bereiter et al. 2015. For detailed references of all records refer to the supplemetary information of
Bereiter et al. 2015. For latest anthropogenic data refer to NOAA/Mauna Loa record. Age unit is in years before present (yr BP)
where present refers to 1950 AD. Note, not all records shown in Excel worksheet "all records" are part of the composite.
Composite built from the following:
-51-1800 yr BP: Law Dome (Rubino et al., 2013)
1.8-2 kyr BP: Law Dome (MacFarling Meure et al., 2006)
2-11 kyr BP: Dome C (Monnin et al., 2001 + 2004)
11-22 kyr BP: WAIS (Marcott et al., 2014) minus 4 ppmv (see text)
22-40 kyr BP: Siple Dome (Ahn et al., 2014)
40-60 kyr BP: TALDICE (Bereiter et al., 2012)
60-115 kyr BP: EDML (Bereiter et al., 2012)
105-155 kyr BP: Dome C Sublimation (Schneider et al., 2013)
155-393 kyr BP: Vostok (Petit et al., 1999)
393-611 kyr BP: Dome C (Siegenthaler et al., 2005)
612-800 kyr BP: Dome C (Bereiter et al., 2014)
If millennial scale or smaller details of the composite are studied, we recommend to look into all records available
for that period and not only in the composite.
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Publication
Authors: Bernhard Bereiter, Sarah Eggleston, Jochen Schmitt, Christoph Nehrbass-Ahles, Thomas F. Stocker, Hubertus Fischer, Sepp Kipfstuhl and Jerome Chappellaz
Published_Date_or_Year: 2015-01-23
Published_Title: Revision of the EPICA Dome C CO2 record from 800 to 600&8201;kyr before present
Journal_Name: Geophysical Research Letters
Volume:
Edition:
Issue:
Pages:
DOI: 10.1002/2014GL061957
Online_Resource: http://onlinelibrary.wiley.com/doi/10.1002/2014GL061957/abstract
Full_Citation:
Abstract: The European Project for Ice Coring in Antarctica Dome ice core from Dome C (EDC) has allowed for the reconstruction of atmospheric CO2 concentrations for the last 800,000&8201;years. Here we revisit the oldest part of the EDC CO2 record using different air extraction methods and sections of the core. For our established cracker system, we found an analytical artifact, which increases over the deepest 200&8201;m and reaches 10.1 +/- 2.4&8201;ppm in the oldest/deepest part. The governing mechanism is not yet fully understood, but it is related to insufficient gas extraction in combination with ice relaxation during storage and ice structure. The corrected record presented here resolves partly - but not completely - the issue with a different correlation between CO2 and Antarctic temperatures found in this oldest part of the records. In addition, we provide here an update of 800,000&8201;years atmospheric CO2 history including recent studies covering the last glacial cycle.
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Publication
Authors: Dieter Luthi, Martine Le Floch, Bernhard Bereiter, Thomas Blunier, Jean-Marc Barnola, Urs Siegenthaler, Dominique Raynaud, Jean Jouzel, Hubertus Fischer, Kenji Kawamura, and Thomas F. Stocker
Published_Date_or_Year: 2008-05-15
Published_Title: High-resolution carbon dioxide concentration record 650,000-800,000 years before present
Journal_Name: Nature
Volume: 453
Edition:
Issue:
Pages: 379-382
DOI: 10.1038/nature06949
Online_Resource: http://www.nature.com/nature/journal/v453/n7193/full/nature06949.html
Full_Citation:
Abstract: Changes in past atmospheric carbon dioxide concentrations can be determined by measuring the composition of air trapped in ice cores from Antarctica. So far, the Antarctic Vostok and EPICA Dome C ice cores have provided a composite record of atmospheric carbon dioxide levels over the past 650,000 years. Here we present results of the lowest 200 m of the Dome C ice core, extending the record of atmospheric carbon dioxide concentration by two complete glacial cycles to 800,000 yr before present. From previously published data and the present work, we find that atmospheric carbon dioxide is strongly correlated with Antarctic temperature throughout eight glacial cycles but with significantly lower concentrations between 650,000 and 750,000 yr before present. Carbon dioxide levels are below 180 parts per million by volume (p.p.m.v.) for a period of 3,000 yr during Marine Isotope Stage 16, possibly reflecting more pronounced oceanic carbon storage. We report the lowest carbon dioxide concentration measured in an ice core, which extends the pre-industrial range of carbon dioxide concentrations during the late Quaternary by about 10 p.p.m.v. to 172–300 p.p.m.v.
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Funding_Agency
Funding_Agency_Name: European Union
Grant:
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Funding_Agency
Funding_Agency_Name: Swiss National Science Foundation
Grant: P2BEP2_152071
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Funding_Agency
Funding_Agency_Name: University of Bern
Grant:
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Funding_Agency
Funding_Agency_Name: French Polar Institute (IPEV)
Grant: 902
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Site_Information
Site_Name: EPICA Dome C
Location: Antarctica
Country:
Northernmost_Latitude: -75.1
Southernmost_Latitude: -75.1
Easternmost_Longitude: 123.4
Westernmost_Longitude: 123.4
Elevation: 3240 m
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Data_Collection
Collection_Name: Antarctica2015CO2EDC
Earliest_Year:
Most_Recent_Year:
Time_Unit: Cal. Year BP
Core_Length: m
Notes:
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Chronology:
Antarctic ice core chronology 2012 (AICC2012, Bazin et al., 2013) and EDC3
AICC2012: http://www.ncdc.noaa.gov/paleo/study/15076
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Variables
Data variables follow that are preceded by "" in columns one and two.
Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data)
depth_m depth, , , m, , , , ,N
age_gas_calBP age, gas, , calendar years before present, , , , EDC3,N
age_gas_calBP age, gas, , calendar years before present, , , , AICC2012,N
co2_ppm CO2 concentration, , , ppmv, , , corrected, ,N
co2_1s_ppm CO2 concentration sigma mean, , , ppmv, , , , ,N
co2_corr CO2 correcting factor, , , ppmv, , , , ,N
co2_corr- CO2 correcting factor 2s lower bound, , , ppmv, , , , ,N
co2_corr+ CO2 correcting factor 2s upper bound, , , ppmv, , , , ,N
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Data:
Data line format - tab-delimited text, variable short name as header