{"NOAAStudyId":"21770","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2017-03-23","dataPublisher":"NOAA","dataType":"PALEOCEANOGRAPHY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-21770.xml","doi":null,"earliestYearBP":35850000,"earliestYearCE":-35848050,"entryId":"noaa-ocean-21770","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"ANT 1245283"}],"investigators":"Passchier, S.; Ciarletta, D.J.; Miriagos, T.E.","mostRecentYearBP":32910000,"mostRecentYearCE":-32908050,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/21770","originalSource":null,"publication":[{"abstract":"Earth’s current icehouse phase began ~34 m.y. ago with the onset of major Antarctic glaciation at the Eocene-Oligocene transition. Changes in ocean circulation and a decline in atmospheric greenhouse gas levels were associated with stepwise cooling and ice growth at southern high latitudes. The Antarctic cryosphere plays a critical role in the ocean-atmosphere system, but its early evolution is still poorly known. With a near-field record from Prydz Bay, Antarctica, we demonstrate that Antarctic ice growth was stepwise and had an earlier onset than previously suggested. Prydz Bay lies downstream of a major East Antarctic Ice Sheet drainage system, and its sedimentary records uniquely constrain the timing of ice-sheet advance onto the continental shelf. We investigated a detrital record extracted from three Ocean Drilling Program drill holes within a new depositional and chronological framework spanning the late Eocene to early Oligocene (ca. 36–33 Ma). The chemical index of alteration (CIA) and the S index, calculated from the major-element geochemistry of bulk samples, yielded estimates of chemical weathering intensities and mean annual temperature on the East Antarctic continent. We document evidence for late Eocene mountain glaciation along with transient warm events at 35.8–34.8 Ma. From 34.4 Ma, associated with the Eocene-Oligocene transition precursor d18O excursion, glaciers advanced into Prydz Bay, coincident with a decline in chemical weathering and temperature. We conclude that Antarctic continental ice growth commenced with the Eocene-Oligocene transition “precursor” glaciation, during a time of Subantarctic surface ocean cooling and a decline in atmospheric pCO2. These results call for dynamic high-latitude feedbacks that are currently poorly represented in Earth system models and emphasize the need for additional near-field glacio-sedimentological, high-latitude sea-surface temperature and pCO2 records across the Eocene-Oligocene transition.","author":{"name":"Passchier, S., Ciarletta, D.J., Miriagos, T.E., Bijl, P.K., and Bohaty, S.M."},"citation":"Passchier, S., Ciarletta, D.J., Miriagos, T.E., Bijl, P.K., and Bohaty, S.M. 2017. An Antarctic stratigraphic record of stepwise ice growth through the Eocene-Oligocene transition. Geological Society of America Bulletin, 129(3-4), 318-330. doi: 10.1130/B31482.1","edition":null,"identifier":{"id":"10.1130/B31482.1","type":"doi","url":"http://dx.doi.org/10.1130/B31482.1"},"issue":"3-4","journal":"Geological Society of America Bulletin","pages":"318-330","pubRank":"1","pubYear":2017,"reportNumber":null,"title":"An Antarctic stratigraphic record of stepwise ice growth through the Eocene-Oligocene transition","type":"publication","volume":"129"}],"reconstruction":"Y","scienceKeywords":["Air Temperature 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