{"NOAAStudyId":"20439","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":"2016-08-24","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-20439.xml","doi":null,"earliestYearBP":1500000,"earliestYearCE":-1498050,"entryId":"noaa-ocean-20439","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE-1436014"}],"investigators":"Ford, H.L.; Sosdian, S.M.; Rosenthal, Y.; Raymo, M.E.","mostRecentYearBP":500000,"mostRecentYearCE":-498050,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/20439","originalSource":null,"publication":[{"abstract":"During the Mid-Pleistocene Transition (MPT), the dominant glacial-interglacial cyclicity as inferred from the marine d18O records of benthic foraminifera (d18Obenthic) changed from 41 kyr to 100 kyr years in the absence of a comparable change in orbital forcing. Currently, only two Mg/Ca-derived, high-resolution bottom water temperature (BWT) records exist that can be used with d18Obenthic records to separate temperature and ice volume signals over the Pleistocene. However, these two BWT records suggest a different pattern of climate change occurred over the MPTda record from North Atlantic DSDP Site 607 suggests BWT decreased with no long-term trend in ice volume over the MPT, while South Pacific ODP Site 1123 suggests that BWT has been relatively stable over the last 1.5 Myr but that there was an abrupt increase in ice volume at ~900 kyr. In this paper we attempt to reconcile these two views of climate change across the MPT. Specifically, we investigated the suggestion that the secular BWT trend obtained from Mg/Ca measurements on Cibicidoides wuellerstorfi and Oridorsalis umbonatus species from N. Atlantic Site 607 is biased by the possible influence of D[CO3 2_] on Mg/Ca values in these species by generating a low-resolution BWT record using Uvigerina spp., a genus whose Mg/Ca values are not thought to be influenced by D[CO3 2_]. We find a long-term BWT cooling of ~2e3_C occurred from 1500 to ~500 kyr in the N. Atlantic, consistent with the previously generated C. wuellerstorfi and O. umbonatus BWT record. We also find that changes in ocean circulation likely influenced d18Obenthic, BWT, and d18Oseawater records across the MPT. N. Atlantic BWT cooling starting at ~1.2 Ma, presumably driven by high-latitude cooling, may have been a necessary precursor to a threshold response in climate-ice sheet behavior at ~900 ka. At that point, a modest increase in ice volume and thermohaline reorganization may have caused enhanced sensitivity to the 100 kyr orbital cycle.","author":{"name":"Ford, H.L., S.M. Sosdian, Y. Rosenthal, and M.E. Raymo"},"citation":"Ford, H.L., S.M. Sosdian, Y. Rosenthal, and M.E. Raymo. 2016. Gradual and abrupt changes during the Mid-Pleistocene Transition. Quaternary Science Reviews, 148, 222-233. doi: 10.1016/j.quascirev.2016.07.005","edition":null,"identifier":{"id":"10.1016/j.quascirev.2016.07.005","type":"doi","url":"http://dx.doi.org/10.1016/j.quascirev.2016.07.005"},"issue":null,"journal":"Quaternary Science Reviews","pages":"222-233","pubRank":"1","pubYear":2016,"reportNumber":null,"title":"Gradual and abrupt changes during the Mid-Pleistocene Transition","type":"publication","volume":"148"}],"reconstruction":"Y","scienceKeywords":null,"site":[{"NOAASiteId":"30611","geo":{"geoType":"Feature","geometry":{"coordinates":["41.000019","-32.950122"],"type":"POINT"},"properties":{"easternmostLongitude":"-32.950122","maxElevationMeters":"-3427","minElevationMeters":"-3427","northernmostLatitude":"41.000019","southernmostLatitude":"41.000019","westernmostLongitude":"-32.950122"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"31106","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>oxygen isotopes","earth science>paleoclimate>paleocean>reconstruction","earth science>paleoclimate>paleocean>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2016/ford2016.txt","linkText":"DSDP 607 Data","urlDescription":"Formatted Text File","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>sample identification"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>notes"},{"cvAdditionalInfo":"deepwater temperature using Uvigerina 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SMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>sea water","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil SMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":"composited","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar kiloyear before present","cvWhat":"age 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foraminifer>Uvigerina sp.","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"micromole per mole","cvWhat":"chemical composition>element or compound ratio>aluminum/calcium"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>benthic foraminifer>calcareous benthic foraminifer>Uvigerina sp.","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"micromole per mole","cvWhat":"chemical composition>element or compound ratio>titanium/calcium"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>benthic foraminifer>calcareous benthic foraminifer>Uvigerina sp.","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"micromole per mole","cvWhat":"chemical composition>element or compound ratio>manganese/calcium"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>benthic foraminifer>calcareous benthic foraminifer>Uvigerina sp.","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"micromole per mole","cvWhat":"chemical composition>element or compound ratio>iron/calcium"}]}],"dataTableName":"DSDP607 Ford16","dataTableNotes":null,"earliestYear":1500000,"earliestYearBP":1500000,"earliestYearCE":-1498050,"mostRecentYear":500000,"mostRecentYearBP":500000,"mostRecentYearCE":-498050,"species":[],"timeUnit":"cal yr BP"}],"siteName":"DSDP 607"}],"studyCode":null,"studyName":"North Atlantic (DSDP 607) Geochemistry Data and BWT Reconstruction during the Mid-Pleistocene Transition","studyNotes":"DSDP 607 minor element and derived d18Oseawater records from Uvigerina spp.\n     Provided Keywords: Mid-Pleistocene Transition, Mg/Ca, Uvigerina spp.","version":"1.0","xmlId":"18247"}