{"xmlId":"9152","NOAAStudyId":"10488","studyName":"North Atlantic RAPiD Deglacial Paired Mg/Ca-d18O and d18Osw-SST Reconstructions","doi":"https://doi.org/10.25921/ggza-0a27","uuid":"1f7e1e1c-269a-423a-af0c-a67ab4b34717","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":"Thornalley, D.J.R.; McCave, I.N.; Elderfield, H.","investigatorDetails":[{"firstName":"David","lastName":"Thornalley","initials":"D.J.R.","orcId":"0000-0001-5885-5499"},{"firstName":"Nick","lastName":"McCave","initials":"I.N.","orcId":"0000-0002-4702-5489"},{"firstName":"Henry","lastName":"Elderfield","initials":"H.","orcId":null}],"version":"1.0","funding":[{"fundingAgency":"UK Natural Environment Research Council (NERC)","fundingGrant":"RAPID NER/T/S/2002/00436"}],"studyNotes":"Paired Mg/Ca and d18O measurements from foraminifera plus reconstructed d18Oseawater and SST from RAPiD cores collected in the North Atlantic south of Iceland.  \r\n\r\nData collected by David J.R. Thornalley (Univ. of Cambridge) Principal Investigator: I. Nick McCave (Univ. of Cambridge) Cruise CD-159, funded by UK RAPID program \r\n\r\nStable isotope values relative to VPDB standard, run in Godwin Laboratory, Univ. of Cambridge. Temperature calculated using Mg/Ca = B exp (0.1 × T) B = 0.794 and 0.675 for G. bulloides and G. inflata, respectively. d18Osw calculated using Kim and O'Neil (1997), including a 0.60 offset for G. bulloides, and VPDB to SMOW conversion of 0.270. \"Ice-volume corrected\" for whole ocean changes using Fairbanks (1989) sea-level curve, assuming a LGM to late Holocene shift of 1 0.","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/10488","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-10488.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-ocean-10488.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/paleoceanography","studyCode":null,"scienceKeywords":["abrupt climate change","Sea Surface Temperature Reconstruction"],"reconstruction":"Y","contributionDate":"2010-01-18","entryId":"noaa-ocean-10488","earliestYearBP":21292,"mostRecentYearBP":7004,"earliestYearCE":-19342,"mostRecentYearCE":-5054,"publication":[{"author":{"name":"Thornalley, D.J.R., I.N. McCave, and H. Elderfield"},"pubYear":2010,"title":"Freshwater input and abrupt deglacial climate change in the North Atlantic","journal":"Paleoceanography","volume":"25","edition":null,"issue":"1","pages":null,"reportNumber":"PA1201","citation":"Thornalley, D.J.R., I.N. McCave, and H. Elderfield. 2010. Freshwater input and abrupt deglacial climate change in the North Atlantic. Paleoceanography, 25(1), PA1201. doi: 10.1029/2009PA001772","type":"publication","identifier":{"type":"doi","id":"10.1029/2009PA001772","url":"http://dx.doi.org/10.1029/2009PA001772"},"abstract":"Greenland ice core records indicate that the last deglaciation (~7-21 ka) was punctuated by numerous abrupt climate reversals involving temperature changes of up to 5°C-10°C within decades. However, the cause behind many of these events is uncertain. A likely candidate may have been the input of deglacial meltwater, from the Laurentide ice sheet (LIS), to the high-latitude North Atlantic, which disrupted ocean circulation and triggered cooling. Yet the direct evidence of meltwater input for many of these events has so far remained undetected. In this study, we use the geochemistry (paired Mg/Ca-d18O) of planktonic foraminifera from a sediment core south of Iceland to reconstruct the input of freshwater to the northern North Atlantic during abrupt deglacial climate change. Our record can be placed on the same timescale as ice cores and therefore provides a direct comparison between the timing of freshwater input and climate variability. Meltwater events coincide with the onset of numerous cold intervals, including the Older Dryas (14.0 ka), two events during the Allerød (at ~13.1 and 13.6 ka), the Younger Dryas (12.9 ka), and the 8.2 ka event, supporting a causal link between these abrupt climate changes and meltwater input. During the Bølling-Allerød warm interval, we find that periods of warming are associated with an increased meltwater flux to the northern North Atlantic, which in turn induces abrupt cooling, a cessation in meltwater input, and eventual climate recovery. This implies that feedback between climate and meltwater input produced a highly variable climate. A comparison to published data sets suggests that this feedback likely included fluctuations in the southern margin of the LIS causing rerouting of LIS meltwater between southern and eastern drainage outlets, as proposed by Clark et al. 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