{"xmlId":"11256","NOAAStudyId":"13214","studyName":"Orca Basin MD02-2550 Deglacial Paired Mg/Ca, d18O, and d18Osw","doi":"https://doi.org/10.25921/0tyt-q165","uuid":"ee39aada-259e-4f4f-b38c-362487a26fa1","dataPublisher":"NOAA","contactInfo":{"type":"CONTACT INFORMATION","shortName":"DOC/NOAA/NESDIS/NCEI","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","address":"325 Broadway, E/NE31","city":"Boulder","state":"CO","postalCode":"80305-3328","country":"USA","dataCenterUrl":"https://www.ncei.noaa.gov/products/paleoclimatology","email":"paleo@noaa.gov","phone":"828-271-4800","fax":null,"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."},"dataType":"PALEOCEANOGRAPHY","investigators":"Williams, C.; Flower, B.P.; Hastings, D.W.","investigatorDetails":[{"firstName":"Carlie","lastName":"Williams","initials":"C.","orcId":null},{"firstName":"Benjamin","lastName":"Flower","initials":"B.P.","orcId":null},{"firstName":"David","lastName":"Hastings","initials":"D.W.","orcId":null}],"version":"1.0","funding":[{"fundingAgency":"Comer Science and Education Foundation","fundingGrant":"CP-18"},{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE-0318361 and OCE0903017"}],"studyNotes":"High resolution foraminiferal (Globigerinoides ruber) d18OGOM \n(ice-volume corrected d18Osw) data from the Orca Basin, \nin the northern Gulf of Mexico, are used to reconstruct \nLaurentide Ice Sheet meltwater input during the last deglaciation. \n\nCore MD02-2550, Orca Basin, northern Gulf of Mexico: \n26°56.78'N, 91°20.75'W, water depth 2248m","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/13214","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-13214.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-ocean-13214.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/paleoceanography","studyCode":null,"scienceKeywords":null,"reconstruction":"Y","contributionDate":"2012-08-14","entryId":"noaa-ocean-13214","earliestYearBP":18378,"mostRecentYearBP":10731,"earliestYearCE":-16428,"mostRecentYearCE":-8781,"publication":[{"author":{"name":"Williams, C., B.P. Flower, and D.W. Hastings"},"pubYear":2012,"title":"Seasonal Laurentide Ice Sheet melting during the \"Mystery Interval\" (17.5-14.5 ka)","journal":"Geology","volume":"40","edition":null,"issue":"10","pages":"955958","reportNumber":null,"citation":"Williams, C., B.P. Flower, and D.W. Hastings. 2012. Seasonal Laurentide Ice Sheet melting during the \"Mystery Interval\" (17.5-14.5 ka). Geology, 40(10), 955958. doi: 10.1130/G33279.1","type":"publication","identifier":{"type":"doi","id":"10.1130/G33279.1","url":"http://dx.doi.org/10.1130/G33279.1"},"abstract":"The last deglaciation in the Northern Hemisphere was interrupted by two major stadials, the so-called \"Mystery Interval\" (17.5-14.5 ka) and the Younger Dryas (12.9-11.7 ka). During these events, the North Atlantic region was marked by cold surface conditions, yet simultaneous glacier and snowline retreat. Rerouting of Laurentide Ice Sheet meltwater from the Gulf of Mexico to an eastern or northern spillway may have reduced meridional overturning circulation at the onset of the Younger Dryas. However, this hypothesis has not been tested for the Mystery Interval. Paired Mg/Ca and 18O measurements on foraminifera from laminated Orca Basin sediments in the Gulf of Mexico, constrained by 35 14C dates, document the timing of meltwater input with subcentennial resolution. Isolating the 18O of seawater (termed 18OGOM) reveals three major melting episodes from ca. 17.5 ka until 12.9 ka, followed by a rapid cessation, consistent with meltwater rerouting at the onset of the Younger Dryas. Conversely, inferred meltwater flow to the Gulf of Mexico during the Mystery Interval does not support a simple routing event, but is consistent with glacier and snowline retreat. We suggest that summer melting of Northern Hemisphere ice sheets during this stadial may have been an important mechanism for enhanced winter sea-ice formation, hypercold winter conditions, and enhanced seasonality in the North Atlantic region.","pubRank":"1"}],"site":[{"NOAASiteId":"36995","siteName":"MD02-2550","siteCode":null,"mappable":"Y","locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean>Gulf Of Mexico","geo":{"geoType":"Feature","geometry":{"type":"POINT","coordinates":["26.9463","-91.3458"]},"properties":{"southernmostLatitude":"26.9463","northernmostLatitude":"26.9463","westernmostLongitude":"-91.3458","easternmostLongitude":"-91.3458","minElevationMeters":"-2248","maxElevationMeters":"-2248"}},"paleoData":[{"dataTableName":"MD02-2550-2012","NOAADataTableId":"22688","earliestYear":18378,"mostRecentYear":10731,"timeUnit":"cal yr BP","earliestYearBP":18378,"mostRecentYearBP":10731,"earliestYearCE":-16428,"mostRecentYearCE":-8781,"coreLengthMeters":null,"dataTableNotes":null,"species":[],"dataFile":[{"fileUrl":"https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/williams2012/williams2012.txt","urlDescription":"Original Data and Full Metadata","linkText":"williams2012.txt","variables":[{"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O","cvMaterial":"hydrologic material>sea water|reconstruction material>element or compound ratio>magnesium/calcium|reconstruction material>isotope ratio>delta 18O","cvError":null,"cvUnit":"concentration unit>parts per notation unit>parts per thousand>per mil>per mil VSMOW","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"G. ruber white","cvFormat":"Numeric","cvShortName":null},{"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O","cvMaterial":"hydrologic material>sea water|reconstruction material>element or compound ratio>magnesium/calcium|reconstruction material>isotope ratio>delta 18O","cvError":null,"cvUnit":"concentration unit>parts per notation unit>parts per thousand>per mil>per mil VSMOW","cvSeasonality":null,"cvDetail":"corrected","cvMethod":null,"cvAdditionalInfo":"ice-volume corrected; 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