{"NOAAStudyId":"19481","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":"2015-11-20","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-19481.xml","doi":null,"earliestYearBP":34492,"earliestYearCE":-32542,"entryId":"noaa-ocean-19481","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE-0823498, OCE-0648258, OCE-0096472"}],"investigators":"Them, T.R. II; Schmidt, M.W.; Lynch-Stieglitz, J.","mostRecentYearBP":20254,"mostRecentYearCE":-18304,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/19481","originalSource":null,"publication":[{"abstract":"Abrupt, millennial-scale climate oscillations, known as Dansgaard-Oeschger (D-O) cycles, characterized the climate system of the last glacial period. Although proxy evidence shows that D-O cycles resulted in large-scale changes in atmospheric circulation patterns around the planet, an understanding of how Atlantic Meridional Overturning Circulation (AMOC) varied across these events remains unclear. Here, we take advantage of the fact that both tropical atmospheric circulation changes corresponding to north-south shifts in the Intertropical Convergence Zone (ITCZ) and large-scale changes in ocean circulation associated with AMOC variability can be reconstructed in the same sediment core from the Florida Straits to examine the relationship between atmospheric and ocean circulation changes across D-O events. To reconstruct surface water conditions, Mg/Ca-paleothermometry and stable isotope measurements were combined on the planktonic foraminifera Globigerinoides ruber (white variety) from sediment core KNR166-2 JPC26 (24 19.61'N, 83 15.14'W; 546 m depth) to reconstruct a high-resolution record of sea surface temperature and d18OSEAWATER (a proxy for upper mixed layer salinity) during Marine Isotope Stages (MIS) 2 and 3 from 20 - 35 ka BP. As an additional proxy for upper water column salinity change, we also generate a faunal abundance record of the salinity-sensitive planktonic foraminifera Neogloboquadrina dutertrei. Our results suggest that rapid reductions in sea surface salinity occurred at the onset of D-O interstadials, while stadials are characterized by increased surface salinities. The most likely cause of these salinity changes was variation in the strength and position of the ITCZ across D-O events.  Finally, we examine the relationship between millennial-scale atmospheric circulation changes recorded in the planktonic records and ocean circulation changes inferred from the benthic d18O record from our core. Our results provide some of the first evidence that AMOC strength did vary across at least one of the millennial-scale D-O cycles of MIS 3.","author":{"name":"Them, T.R. II, Schmidt, M.W. and Lynch-Stieglitz, J."},"citation":"Them, T.R. II, Schmidt, M.W. and Lynch-Stieglitz, J. 2015. Millennial-Scale Tropical Atmospheric and Atlantic Ocean Circulation Change From the Last Glacial Maximum and Marine Isotope Stage 3. Earth and Planetary Science Letters, 427, 47-56. doi: 10.1016/j.epsl.2015.06.062 ","edition":null,"identifier":{"id":"10.1016/j.epsl.2015.06.062 ","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2015.06.062 "},"issue":null,"journal":"Earth and Planetary Science Letters","pages":"47-56","pubRank":"1","pubYear":2015,"reportNumber":null,"title":"Millennial-Scale Tropical Atmospheric and Atlantic Ocean Circulation Change From the Last Glacial Maximum and Marine Isotope Stage 3","type":"publication","volume":"427"}],"reconstruction":"Y","scienceKeywords":["Last Glacial Maximum","Sea Surface Temperature Reconstruction"],"site":[{"NOAASiteId":"52444","geo":{"geoType":"Feature","geometry":{"coordinates":["24.326833","-83.252333"],"type":"POINT"},"properties":{"easternmostLongitude":"-83.252333","maxElevationMeters":"-546","minElevationMeters":"-546","northernmostLatitude":"24.326833","southernmostLatitude":"24.326833","westernmostLongitude":"-83.252333"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean>Gulf Of Mexico","mappable":"Y","paleoData":[{"NOAADataTableId":"30079","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry","earth science>paleoclimate>paleocean>reconstruction"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/them2015/them2015.txt","linkText":"Florida Straits Mg/Ca SST and d18Osw Reconstructions","urlDescription":"Data File","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>planktic foraminifer>Globigerinoides sp.>Globigerinoides ruber","cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"millimole per mole","cvWhat":"chemical composition>element or compound ratio>magnesium/calcium"},{"cvAdditionalInfo":"manual count","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"count per gram","cvWhat":"biological material>organism>foraminifer>identified foraminifer>Neogloboquadrina dutertrei"},{"cvAdditionalInfo":"Anand et al. 2003; G.ruber Mg/Ca","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>element or compound ratio>magnesium/calcium","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>sea water temperature>sea surface temperature"},{"cvAdditionalInfo":"corrected for ice volume","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>isotope ratio>delta 18O","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"corrected for ice volume","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>element or compound ratio>magnesium/calcium","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"corrected for ice volume","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>sea water","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","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"}]}],"dataTableName":"Them2015MgCaSST","dataTableNotes":null,"earliestYear":34492,"earliestYearBP":34492,"earliestYearCE":-32542,"mostRecentYear":20254,"mostRecentYearBP":20254,"mostRecentYearCE":-18304,"species":[],"timeUnit":"cal yr BP"}],"siteName":"KNR166-2-26JPC"}],"studyCode":null,"studyName":"Florida Straits 35 - 20 KYrBP Mg/Ca SST and d18Osw Reconstructions","studyNotes":"Planktonic foraminiferal Mg/Ca and abundance data plus reconstructed SST and d18O-seawater from a Florida Straits sediment core covering the Last Glacial Maximum and Marine Isotope Stage 3 (35 - 20 KYrBP).","version":"1.0","xmlId":"17191"}