{"NOAAStudyId":"26730","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":"2019-05-06","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-26730.xml","doi":null,"earliestYearBP":21342,"earliestYearCE":-19392,"entryId":"noaa-ocean-26730","funding":[{"fundingAgency":"University of North Carolina-Wilmington","fundingGrant":"Charles Cahill Award, Center for Marine Science Pilot Project, Center for Marine Science Graduate Student Award, CSURF Undergraduate Research Award"}],"investigators":"Hoffmann, S.S.; Dalsing, R.E.; Murphy, S.C.","mostRecentYearBP":750,"mostRecentYearCE":1200,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/26730","originalSource":null,"publication":[{"abstract":"The Labrador Sea is a vital region for the Atlantic Meridional Overturning Circulation (AMOC), where overflow waters from the Nordic Seas mix with locally produced Labrador Sea Water, before exiting to the interior of the Atlantic Ocean. The dynamical sedimentary proxy of mean sortable silt size (SS) can give information on past changes in deep water circulation speed and the strength of AMOC. We have produced (SS) records from two core sites at depths between 1500 and 2000 m on the continental slope east of Newfoundland, to reconstruct changes in intermediate depth water circulation speed, including Glacial North Atlantic Intermediate Water and Labrador Sea Water over the past 22,000 years. Increases in (SS) appear to coincide with much of the deglaciation as well as the mid-late Holocene. End-member modeling suggests that ice-rafted debris (IRD) is an important factor in interpreting (SS) during the deglaciation. We find that a robust increase in (SS) is likely unrelated to IRD during the past 5 ka, and probably reflects increased flow at intermediate depths due to local production of LSW strengthening as Nordic Seas overflows weakened at this depth. Our results highlight both the complications of producing (SS) records in IRD-rich, slope environments and the promise that this proxy nevertheless has for reconstructing dynamical changes in deep ocean currents.","author":{"name":"Hoffmann, S.S., Dalsing, R.E., and Murphy, S.C."},"citation":"Hoffmann, S.S., Dalsing, R.E., and Murphy, S.C. 2019. Sortable silt records of intermediate-depth circulation and sedimentation in the Southwest Labrador Sea since the Last Glacial Maximum. Quaternary Science Reviews, 206, 99-110. doi: 10.1016/j.quascirev.2018.12.028","edition":null,"identifier":{"id":"10.1016/j.quascirev.2018.12.028","type":"doi","url":"http://dx.doi.org/10.1016/j.quascirev.2018.12.028"},"issue":null,"journal":"Quaternary Science Reviews","pages":"99-110","pubRank":"1","pubYear":2019,"reportNumber":null,"title":"Sortable silt records of intermediate-depth circulation and sedimentation in the Southwest Labrador Sea since the Last Glacial Maximum","type":"publication","volume":"206"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"57873","geo":{"geoType":"Feature","geometry":{"coordinates":["49","49.244","-48.9877","-45.017"],"type":"POLYGON"},"properties":{"easternmostLongitude":"-45.017","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"49.244","southernmostLatitude":"49","westernmostLongitude":"-48.9877"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean","mappable":"N","paleoData":[{"NOAADataTableId":"39144","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffmann2019/hoffmann2019-d18o.txt","linkText":"V23-18, KN158-4-27/28 d18O Data","urlDescription":"NOAA Template File","variables":[]}],"dataTableName":"V23-18+KN158-4-27/28 d18O Hoffmann2019","dataTableNotes":"KN158-4-27GGC ISGN: DSR0002YY; KN158-4-28GGC DSR0002YZ; V23-18PC DSR000W72","earliestYear":21342,"earliestYearBP":21342,"earliestYearCE":-19392,"mostRecentYear":2750,"mostRecentYearBP":2750,"mostRecentYearCE":-800,"species":[],"timeUnit":"cal yr BP"},{"NOAADataTableId":"39145","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffmann2019/hoffmann2019-em.txt","linkText":"V23-18, KN158-4-27/28 Silt and Grain Size Data","urlDescription":"NOAA Template File","variables":[]}],"dataTableName":"V23-18+KN158-4-27/28 EM Hoffmann2019","dataTableNotes":"KN158-4-27GGC ISGN: DSR0002YY; KN158-4-28GGC DSR0002YZ; V23-18PC DSR000W72","earliestYear":21340,"earliestYearBP":21340,"earliestYearCE":-19390,"mostRecentYear":4430,"mostRecentYearBP":4430,"mostRecentYearCE":-2480,"species":[],"timeUnit":"cal yr BP"},{"NOAADataTableId":"39146","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffmann2019/hoffmann2019-coarse.txt","linkText":"V23-18, KN158-4-27/28 Coarse Fraction Data","urlDescription":"NOAA Template File","variables":[]}],"dataTableName":"V23-18+KN158-4-27/28 Coarse Hoffmann2019","dataTableNotes":"KN158-4-27GGC ISGN: DSR0002YY; KN158-4-28GGC ISGN: DSR0002YZ; V23-18PC ISGN: DSR000W72","earliestYear":21342,"earliestYearBP":21342,"earliestYearCE":-19392,"mostRecentYear":750,"mostRecentYearBP":750,"mostRecentYearCE":1200,"species":[],"timeUnit":"cal yr BP"},{"NOAADataTableId":"39147","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffmann2019/hoffmann2019-ca_sr.txt","linkText":"V23-18, KN158-4-27/28 Ca/Sr Data","urlDescription":"NOAA Template File","variables":[]}],"dataTableName":"V23-18+KN158-4-27/28 Ca/Sr Hoffmann2019","dataTableNotes":"KN158-4-27GGC ISGN: DSR0002YY; KN158-4-28GGC ISGN: DSR0002YZ; V23-18PC ISGN: DSR000W72","earliestYear":20460,"earliestYearBP":20460,"earliestYearCE":-18510,"mostRecentYear":1000,"mostRecentYearBP":1000,"mostRecentYearCE":950,"species":[],"timeUnit":"cal yr BP"}],"siteName":"V23-18, KN158-4-27 and 28"}],"studyCode":null,"studyName":"Late glacial to Holocene sortable silt records from the southwestern Labrador Sea","studyNotes":"Site metadata: KN158-4-27 (49.244 N, -48.9877 W, -1846 m, core length: 2.13); KN158-4-28 (49.2433 N, -48.9872 W, -1828 m, core length: 0.36); V23-18 (49 N, -45.017 W, -1593 m, core length: 4.05)\r\n   Provided Keywords: sediment grain size, sediment geochemistry","version":"1.0","xmlId":"65774"}