Antarctic Ice Core 155,000 Year CO2 and Gas Stable Isotope Data Eggleston, S.; Schmitt, J.; Bereiter, B.; Schneider, R.; Fischer, H. Eggleston, S. Schmitt, J. Bereiter, B. Schneider, R. Fischer, H. carbon cycle earth science/paleoclimate/ice cores (notes,null,null,null,null,ice cores,null,null,C,null) earth science/paleoclimate/ice cores (delta 15N,nitrogen gas,null,per mil AIR,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (number of samples,null,null,null,null,ice cores,null,null,C,null) earth science/paleoclimate/ice cores (delta 13C,carbon dioxide,one standard deviation,per mil,null,ice cores,null,null,N,null) earth science/paleoclimate/climate forcing|ice cores (carbon dioxide,bulk atmosphere,one standard deviation,parts per million,null,climate forcing|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (ice age,null,null,calendar year before present,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (number of samples,null,null,count,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 13C,carbon dioxide,one standard deviation,per mil PDB,null,ice cores,null,null,N,null) earth science/paleoclimate/climate forcing|ice cores (carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 15N,nitrogen gas,one standard deviation,per mil,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 15N,nitrogen gas,one standard deviation,per mil AIR,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 13C,carbon dioxide,null,per mil PDB,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (gas age,null,null,calendar year before present,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core earth science/paleoclimate/ice core earth science/paleoclimate/ice core (EPICA Dome C>LATITUDE -75.1>LONGITUDE 123.4) (EPICA Dronning Maud Land>LATITUDE -75>LONGITUDE .07) (Talos Dome>LATITUDE -72.8>LONGITUDE 159.1) We present new d13C measurements of atmospheric CO2 covering the last glacial/interglacial cycle, complementing previous records covering Terminations I and II. Most prominent in the new record is a significant depletion in d13C(atm) of 0.5per mil occurring during marine isotope stage (MIS) 4, followed by an enrichment of the same magnitude at the beginning of MIS 3. Such a significant excursion in the record is otherwise only observed at glacial terminations, suggesting that similar processes were at play, such as changing sea surface temperatures, changes in marine biological export in the Southern Ocean (SO) due to variations in aeolian iron fluxes, changes in the Atlantic meridional overturning circulation, upwelling of deep water in the SO, and long-term trends in terrestrial carbon storage. Based on previous modeling studies, we propose constraints on some of these processes during specific time intervals. The decrease in d13C(atm) at the end of MIS 4 starting approximately 64 kyr B.P. was accompanied by increasing [CO2]. This period is also marked by a decrease in aeolian iron flux to the SO, followed by an increase in SO upwelling during Heinrich event 6, indicating that it is likely that a large amount of d13C-depleted carbon was transferred to the deep oceans previously, i.e., at the onset of MIS 4. Apart from the upwelling event at the end of MIS 4 (and potentially smaller events during Heinrich events in MIS 3), upwelling of deep water in the SO remained reduced until the last glacial termination, whereupon a second pulse of isotopically light carbon was released into the atmosphere. STUDY NOTES: CO2 concentration and atmospheric gas stable isotope (d13CO2 and d15N2) measurements from 3 Antarctic ice cores (EDC, EDML, Talos Dome) over the last glacial cycle NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Eggleston, S. Investigator : Schmitt, J. Investigator : Bereiter, B. Investigator : Schneider, R. Investigator : Fischer, H. 2016-03-28 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/19942 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016talos-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016d13co2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edc-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016talos-co2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edml-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edml-co2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016talos-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016d13co2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edc-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016talos-co2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edml-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edml-co2.txt English https://www.ncdc.noaa.gov/paleo/study/19942 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016talos-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016d13co2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edc-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016talos-co2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edml-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edml-co2.txt Eggleston, S.; Schmitt, J.; Bereiter, B.; Schneider, R.; Fischer, H.2016Evolution of the stable carbon isotope composition of atmospheric CO2 over the last glacial cyclePaleoceanography3110.1002/2015PA002874http://onlinelibrary.wiley.com/doi/10.1002/2015PA002874/full START YEAR: 155000 cal yr BP * END YEAR: 600 cal yr BP .07 -75.1 159.1 -72.8