{"NOAAStudyId":"9627","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":"2010-09-10","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-9627.xml","doi":null,"earliestYearBP":193287,"earliestYearCE":-191337,"entryId":"noaa-ocean-9627","funding":[{"fundingAgency":"European Union","fundingGrant":"EV K2-CT-2000-00089"},{"fundingAgency":"Natural Environment Research Council (NERC)","fundingGrant":"NE/C514758/1"},{"fundingAgency":"The Royal Society","fundingGrant":null}],"investigators":"Margari, V.; Skinner, L.C.; Tzedakis, P.C.; Ganopolski, A.; Vautravers, M.J.; Shackleton, N.J.","mostRecentYearBP":136100,"mostRecentYearCE":-134150,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/9627","originalSource":null,"publication":[{"abstract":"During the last glacial period, iceberg discharges into the North Atlantic disrupted the meridional overturning circulation, leading to cooling in the Northern Hemisphere and warming in Antarctica. This asymmetric response can be explained by a bipolar see-saw mechanism, whereby changes in the strength of the meridional overturning circulation lead to changes in the interhemispheric heat transport. It is unclear, however, to what extent the response of the overturning circulation is a function of freshwater flux and boundary climate conditions. Here we use foraminiferal isotope and pollen records from the Portuguese margin to reconstruct surface- and deep-water hydrography and atmospheric changes during the last and penultimate glacial periods. When we compare our records with temperature reconstructions from Antarctica, we find that the bipolar see-saw was a characteristic feature of both glacial periods. However, the comparison also underlines the dependence of the bipolar see-saw on background climate and magnitude of iceberg discharge. It also suggests that an intensified hydrological cycle may lead to a weaker overturning circulation with a smaller disruption threshold and extended North Atlantic stadial durations. \n","author":null,"citation":"Margari, V., L.C. Skinner, P.C. Tzedakis, A. Ganopolski, M. Vautravers and N.J. Shackleton. 2010. The nature of millennial-scale climate variability during the past two glacial periods. Nature Geoscience 3, 127 - 131. \n","edition":null,"identifier":{"id":"10.1038/ngeo740","type":"doi","url":"http://dx.doi.org/10.1038/ngeo740"},"issue":null,"journal":"Nature Geoscience","pages":null,"pubRank":"1","pubYear":2010,"reportNumber":null,"title":"The nature of millennial-scale climate variability during the past two glacial periods","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["Heinrich Events","Meridional Overturning Circulation (MOC)"],"site":[{"NOAASiteId":"31164","geo":{"geoType":"Feature","geometry":{"coordinates":["37.561333","-10.142167"],"type":"POINT"},"properties":{"easternmostLongitude":"-10.142167","maxElevationMeters":"-2637","minElevationMeters":"-2637","northernmostLatitude":"37.561333","southernmostLatitude":"37.561333","westernmostLongitude":"-10.142167"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"18597","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>oxygen isotopes","earth science>paleoclimate>paleocean>population abundance","earth science>paleoclimate>paleocean>age control"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/margari2010/margari2010.txt","linkText":"margari2010.txt","urlDescription":"Original Data and Full Metadata","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"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 variable>age"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>planktic foraminifer>Globigerina sp.>Globigerina bulloides","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>benthic foraminifer","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"}]}],"dataTableName":"MD01-2444","dataTableNotes":null,"earliestYear":193287,"earliestYearBP":193287,"earliestYearCE":-191337,"mostRecentYear":136100,"mostRecentYearBP":136100,"mostRecentYearCE":-134150,"species":[],"timeUnit":"cal yr BP"}],"siteName":"MD01-2444"}],"studyCode":null,"studyName":"Portuguese Margin MIS6 foraminiferal isotope and palynology data","studyNotes":"The following benthic species were analysed, and adjusted as indicated: Cibicidoides sp.: +0.51; Uvigerina peregrina and similar specimens: 0.0; Globobulimina affinis: -0.4; Cibicidoides wuellerstorfi, +0.64; Globocassidulina sp.: -0.1; Hoeglundina elegans: -0.7. MD01-2444 MIS3 isotope and faunal data in Vautravers and Shackleton, 2006.\n","version":"1.0","xmlId":"8623"}