GRIP Ice Core 8-40KYrBP Carbon Dioxide Data Anklin, M.; Schwander, J.; Stauffer, B.; Tschumi, J.; Fuchs, A.; Barnola, J.M.; Raynaud, D. Anklin, M. Schwander, J. Stauffer, B. Tschumi, J. Fuchs, A. Barnola, J.M. Raynaud, D. earth science/paleoclimate/climate forcing|ice cores (carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,averaged,tunable diode laser absorption spectroscopy,N,null) earth science/paleoclimate/climate forcing|ice cores (carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,averaged,gas chromatography,N,null) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core (GRIP>LATITUDE 72.58>LONGITUDE -37.63) CO2 ice-core records show an increase in the atmospheric concentration of 80-100 parts per million by volume (ppmv) from the last glacial maximum (LGM) to the early Holocene. We present CO2 measurements performed on an ice core from central Greenland, drilled during the Greenland Ice Core Project (GRIP). This CO2 profile from GRIP confirms the most prominent CO2 increase from the LGM, with a mean concentration of 200 ppmv, to the early Holocene with concentrations between 290 and 310 ppmv. Some structures of the new CO2 record are similar to those previously obtained from the Dye 3 ice core (Greenland), which indicated a dilemma between Greenland and Antarctic CO2 records [Oeschger et al., 1988]. Both Greenland cores show high CO2 values for rather mild climatic periods during the last glaciation, whereas CO2 records from Antarctica do not show such high CO2 variations during the glaciation and, furthermore, the CO2 values in the early Holocene are about 20-30 ppmv higher in the GRIP record than in Antarctic records. There is some evidence that the difference could be due to chemical reactions between impurities in the ice leading to an increase of the CO2 concentration under certain conditions. If in situ processes can change the CO2 concentration in the air bubbles, the question arises about how reliably do CO2 records from ice cores reflect the atmospheric composition at the time of ice formation. The discrepancies between the CO2 profiles from Greenland and Antarctica can be explained by in situ production of excess CO2 due to interactions between carbonate and acidic species. Since the carbonate concentration in Antarctic ice is much lower than in Greenland ice, CO2 records from Antarctica are much less affected by such in situ-produced CO2. STUDY NOTES: These measurements of CO2 concentration have been made by gas chromatography on samples of about 40g or 3 cm height. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Anklin, M. Investigator : Schwander, J. Investigator : Stauffer, B. Investigator : Tschumi, J. Investigator : Fuchs, A. Investigator : Barnola, J.M. Investigator : Raynaud, D. 1997-11-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17878 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gcco2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/irlsco2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gcco2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/irlsco2.txt English https://www.ncdc.noaa.gov/paleo/study/17878 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gcco2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/irlsco2.txt M. Anklin, J. Schwander, B. Stauffer, J. Tschumi, A. Fuchs, J. M. Barnola, D. Raynaud1997CO2 record between 40 and 8 kyr B.P. from the Greenland Ice Core Project ice coreJournal of Geophysical Research: Oceans102C1226539-2654510.1029/97JC00182http://onlinelibrary.wiley.com/enhanced/doi/10.1029/97JC00182/ START YEAR: 41483 cal yr BP * END YEAR: 7983 cal yr BP -37.63 72.58 -37.63 72.58