{"NOAAStudyId":"10488","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":"2010-01-18","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-10488.xml","doi":null,"earliestYearBP":21292,"earliestYearCE":-19342,"entryId":"noaa-ocean-10488","funding":[{"fundingAgency":"NERC","fundingGrant":"RAPID NER/T/S/2002/00436"}],"investigators":"Thornalley, D.J.R.; McCave, I.N.; Elderfield, H.","mostRecentYearBP":7004,"mostRecentYearCE":-5054,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/10488","originalSource":null,"publication":[{"abstract":"Greenland ice core records indicate that the last deglaciation \n(~7-21 ka) was punctuated by numerous abrupt climate reversals \ninvolving temperature changes of up to 5°C-10°C within decades. \nHowever, the cause behind many of these events is uncertain. \nA likely candidate may have been the input of deglacial meltwater, \nfrom the Laurentide ice sheet (LIS), to the high-latitude North \nAtlantic, which disrupted ocean circulation and triggered cooling. \nYet the direct evidence of meltwater input for many of these \nevents has so far remained undetected. In this study, we use \nthe geochemistry (paired Mg/Ca-d18O) of planktonic foraminifera \nfrom a sediment core south of Iceland to reconstruct the input \nof freshwater to the northern North Atlantic during abrupt \ndeglacial climate change. Our record can be placed on the same \ntimescale as ice cores and therefore provides a direct comparison \nbetween the timing of freshwater input and climate variability. \nMeltwater events coincide with the onset of numerous cold intervals, \nincluding the Older Dryas (14.0 ka), two events during the Allerød \n(at ~13.1 and 13.6 ka), the Younger Dryas (12.9 ka), and the 8.2 ka \nevent, supporting a causal link between these abrupt climate changes \nand meltwater input. During the Bølling-Allerød warm interval, \nwe find that periods of warming are associated with an increased \nmeltwater flux to the northern North Atlantic, which in turn induces \nabrupt cooling, a cessation in meltwater input, and eventual climate \nrecovery. This implies that feedback between climate and meltwater \ninput produced a highly variable climate. A comparison to published \ndata sets suggests that this feedback likely included fluctuations \nin the southern margin of the LIS causing rerouting of LIS meltwater \nbetween southern and eastern drainage outlets, as proposed by \nClark et al. (2001).\n\n","author":null,"citation":"Thornalley, D.J.R., I.N. McCave, and H. Elderfield. 2010. \nFreshwater input and abrupt deglacial climate change \nin the North Atlantic. \nPaleoceanography, 25, PA1201, doi:10.1029/2009PA001772. \n","edition":null,"identifier":{"id":"10.1029/2009PA001772","type":"doi","url":"http://dx.doi.org/10.1029/2009PA001772"},"issue":null,"journal":"Paleoceanography","pages":null,"pubRank":"1","pubYear":2010,"reportNumber":null,"title":"Freshwater input and abrupt deglacial climate change  in the North Atlantic","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["abrupt climate change","Sea Surface Temperature Reconstruction"],"site":[{"NOAASiteId":"22917","geo":{"geoType":"Feature","geometry":{"coordinates":["62.08","-17.82"],"type":"POINT"},"properties":{"easternmostLongitude":"-17.82","maxElevationMeters":"-1938","minElevationMeters":"-1938","northernmostLatitude":"62.08","southernmostLatitude":"62.08","westernmostLongitude":"-17.82"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic 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Thornalley (Univ. of Cambridge) \nPrincipal Investigator: I. Nick McCave (Univ. of Cambridge) \nCruise CD-159, funded by UK RAPID program \n\nStable isotope values relative to VPDB standard, \nrun in Godwin Laboratory, Univ. of Cambridge   \n\nTemperature calculated using Mg/Ca = B exp (0.1 × T) \nB = 0.794 and 0.675 for G. bulloides and G. inflata, respectively \n\nd18Osw calculated using Kim and O'Neil (1997), \nincluding a 0.6‰ offset for G. bulloides, \nand VPDB to SMOW conversion of 0.27‰    \n\n\"Ice-volume corrected\" for whole ocean changes using Fairbanks (1989) \nsea-level curve, assuming a LGM to late Holocene shift of 1 ‰ \n\n","version":"1.0","xmlId":"9152"}