{"NOAAStudyId":"23473","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":"2018-03-01","dataPublisher":"NOAA","dataType":"CLIMATE FORCING","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/climate-forcing","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-forcing-23473.xml","doi":null,"earliestYearBP":2048189,"earliestYearCE":-2046239,"entryId":"noaa-forcing-23473","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE 06-23621"}],"investigators":"Hönisch, B.; Hemming, N.G.","mostRecentYearBP":3633,"mostRecentYearCE":-1683,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/23473","originalSource":null,"publication":[{"abstract":"The dominant period of Pleistocene glacial cycles changed during the mid-Pleistocene from 40,000 years to 100,000 years, for as yet unknown reasons. Here we present a 2.1-million-year record of sea surface partial pressure of CO2 (Pco2), based on boron isotopes in planktic foraminifer shells, which suggests that the atmospheric partial pressure of CO2 (pco2) was relatively stable before the mid-Pleistocene climate transition. Glacial Pco2 was ~31 microatmospheres higher before the transition (more than 1 million years ago), but interglacial Pco2 was similar to that of late Pleistocene interglacial cycles (<450,000 years ago). These estimates are consistent with a close linkage between atmospheric CO2 concentration and global climate, but the lack of a gradual decrease in interglacial Pco2 does not support the suggestion that a long-term drawdown of atmospheric CO2 was the main cause of the climate transition.","author":{"name":"Bärbel Hönisch, N. Gary Hemming, David Archer, Mark Siddall, Jerry F. McManus"},"citation":"Bärbel Hönisch, N. Gary Hemming, David Archer, Mark Siddall, Jerry F. McManus. 2009. Atmospheric Carbon Dioxide Concentration over the Mid-Pleistocene Transition. Science, 324(5934), 1551-1554. doi: 10.1126/science.1171477","edition":null,"identifier":{"id":"10.1126/science.1171477","type":"doi","url":"http://dx.doi.org/10.1126/science.1171477"},"issue":"5934","journal":"Science","pages":"1551-1554","pubRank":"1","pubYear":2009,"reportNumber":null,"title":"Atmospheric Carbon Dioxide Concentration over the Mid-Pleistocene Transition","type":"publication","volume":"324"},{"abstract":null,"author":{"name":"Bärbel Hönisch, Gary Hemming"},"citation":"Bärbel Hönisch, Gary Hemming. 2005. Surface ocean pH response to variations in pCO2 through two full glacial cycles. Earth and Planetary Science Letters, 236(1-2), 305-314. doi: 10.1016/j.epsl.2005.04.027","edition":null,"identifier":{"id":"10.1016/j.epsl.2005.04.027","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2005.04.027"},"issue":"1-2","journal":"Earth and Planetary Science Letters","pages":"305-314","pubRank":"2","pubYear":2005,"reportNumber":null,"title":"Surface ocean pH response to variations in pCO2 through two full glacial cycles","type":"publication","volume":"236"}],"reconstruction":"Y","scienceKeywords":["carbon cycle"],"site":[{"NOAASiteId":"19249","geo":{"geoType":"Feature","geometry":{"coordinates":["4.77","-20.93"],"type":"POINT"},"properties":{"easternmostLongitude":"-20.93","maxElevationMeters":"-2693","minElevationMeters":"-2693","northernmostLatitude":"4.77","southernmostLatitude":"4.77","westernmostLongitude":"-20.93"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic 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