Subantarctic Atlantic Ocean Foraminifera-bound d15N, Iron and Alkenone Flux Data for the last 160,000 years Martínez-Garcia, A.; Sigman, D.M.; Ren, H.; Anderson, R.F.; Straub, M.; Hodell, D.A.; Jaccard, S.L.; Eglinton, T.I.; Haug, G.H. Martínez-Garcia, A. Sigman, D.M. Ren, H. Anderson, R.F. Straub, M. Hodell, D.A. Jaccard, S.L. Eglinton, T.I. Haug, G.H. earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (iron,sediment,null,milligram per square centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 15N,Globigerina bulloides,null,per mil AIR,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone,sediment,null,nanogram per square centimeter per kiloyear,null,paleoceanography,null,null,N,Alkenone flux) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 1090>LATITUDE -42.908333>LONGITUDE 8.9) John H. Martin, who discovered widespread iron limitation of ocean productivity, proposed that dust-borne iron fertilization of Southern Ocean phytoplankton caused the ice age reduction in atmospheric carbon dioxide (CO2). In a sediment core from the Subantarctic Atlantic, we measured foraminifera-bound nitrogen isotopes to reconstruct ice age nitrate consumption, burial fluxes of iron, and proxies for productivity. Peak glacial times and millennial cold events are characterized by increases in dust flux, productivity, and the degree of nitrate consumption; this combination is uniquely consistent with Subantarctic iron fertilization. The associated strengthening of the Southern Ocean's biological pump can explain the lowering of CO2 at the transition from mid-climate states to full ice age conditions as well as the millennial-scale CO2 oscillations STUDY NOTES: Foraminifera-bound d15N, iron and alkenone fluxes measured in ODP Site 1090 over the past glacial cycle. Provided Keywords: Iron Fertilization, Carbon Dioxide, Southern Ocean, Nitrogen Isotopes, Alkenones NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Martínez-Garcia, A. Investigator : Sigman, D.M. Investigator : Ren, H. Investigator : Anderson, R.F. Investigator : Straub, M. Investigator : Hodell, D.A. Investigator : Jaccard, S.L. Investigator : Eglinton, T.I. Investigator : Haug, G.H. 2015-04-02 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/18318 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-alk.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-fe.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-d15n.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-alk.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-fe.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-d15n.txt English https://www.ncdc.noaa.gov/paleo/study/18318 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-alk.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-fe.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-d15n.txt Martinez-Garcia, A., D.M. Sigman, H. Ren, R.F. Anderson, M. Straub, D.A. Hodell, S.L. Jaccard, T.I. Eglinton, and G.H. Haug2014Iron Fertilization of the Subantarctic Ocean During the Last Ice AgeScience34361771347-135010.1126/science.1246848http://www.sciencemag.org/content/343/6177/1347.abstract START YEAR: 160020 cal yr BP * END YEAR: 1380 cal yr BP 8.9 -42.908333 8.9 -42.908333