noaa-icecore-19942 Antarctic Ice Core 155,000 Year CO2 and Gas Stable Isotope Data Eggleston, S.; Schmitt, J.; Bereiter, B.; Schneider, R.; Fischer, H. Antarctic Ice Core 155,000 Year CO2 and Gas Stable Isotope Data 2016-03-28 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19942 Investigator S. Eggleston Investigator J. Schmitt Investigator B. Bereiter Investigator R. Schneider Investigator H. Fischer 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 nitrogen isotopes earth science paleoclimate ice core carbon isotopes earth science paleoclimate ice core atmospheric gas geoscientificInformation carbon cycle 155000 cal yr BP 600 cal yr BP Complete -75.1 -72.8 .07 159.1 2316 3240 Continent Antarctica EPICA Dome C>LATITUDE -75.1>LONGITUDE 123.4 Continent Antarctica EPICA Dronning Maud Land>LATITUDE -75>LONGITUDE .07 Continent Antarctica Talos Dome>LATITUDE -72.8>LONGITUDE 159.1 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Eggleston, S.; Schmitt, J.; Bereiter, B.; Schneider, R.; Fischer, H. 2016 Paleoceanography 31 10.1002/2015PA002874 http://onlinelibrary.wiley.com/doi/10.1002/2015PA002874/full

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

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016talos-iso.txt Text Data File; Talos Dome Ice Core Gas Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016d13co2.txt Text Data File; Monte Carlo Average of d13CO2 from 3 Antarctic Ice Cores GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edc-iso.txt Text Data File; EPICA Dome C Ice Core Gas Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016.xlsx Excel Data File; Antarctic Ice Core CO2 and Gas Stable Isotope Data, All Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016talos-co2.txt Text Data File; Talos Dome Ice Core CO2 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edml-iso.txt Text Data File; EPICA Dronning Maud Land Ice Core Gas Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/eggleston2016edml-co2.txt Text Data File; EPICA Dronning Maud Land Ice Core CO2 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11