{"xmlId":"75652","NOAAStudyId":"33974","studyName":"Atlantic Ocean Trilobatus sacculifer Na/Ca Data for the Last 20,000 Years","doi":"https://doi.org/10.25921/ah0b-rz38","uuid":"c06ca727-3ee8-47f5-973f-297e7385d16c","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":"Schmidt, M.W.; Hertzberg, J.E.","investigatorDetails":[{"firstName":"Matthew","lastName":"Schmidt","initials":"M.W.","orcId":"0000-0001-6362-7845"},{"firstName":"Jennifer","lastName":"Hertzberg","initials":"J.E.","orcId":"0000-0001-6437-5977"}],"version":"1.0","funding":[],"studyNotes":null,"onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/33974","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-33974.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-ocean-33974.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/paleoceanography","studyCode":null,"scienceKeywords":["Earth Surface Conditions Reconstruction","Interglacial","Glacial","Younger Dryas"],"reconstruction":"N","contributionDate":"2021-08-24","entryId":"noaa-ocean-33974","earliestYearBP":19500,"mostRecentYearBP":970,"earliestYearCE":-17550,"mostRecentYearCE":980,"publication":[{"author":{"name":"Watkins, Colton S., Matthew W. Schmidt, Jennifer E. Hertzberg"},"pubYear":2021,"title":"Calibrating Trilobatus sacculifer Na/Ca Ratios from Atlantic Core-tops as a Proxy for Sea Surface Salinity","journal":"Paleoceanography and Paleoclimatology","volume":"36","edition":null,"issue":"10","pages":null,"reportNumber":"e2021PA004277","citation":"Watkins, Colton S., Matthew W. Schmidt, Jennifer E. Hertzberg. 2021. Calibrating Trilobatus sacculifer Na/Ca Ratios from Atlantic Core-tops as a Proxy for Sea Surface Salinity. Paleoceanography and Paleoclimatology, 36(10), e2021PA004277. doi: 10.1029/2021PA004277","type":"publication","identifier":{"type":"doi","id":"10.1029/2021PA004277","url":"http://dx.doi.org/10.1029/2021PA004277"},"abstract":"Recent studies found a positive correlation between seawater salinity and Na/Ca ratios in foraminiferal calcite, suggesting a potential new paleosalinity proxy (Bertlich et al., 2018, https://doi.org/10.5194/bg-15-5991-2018; Hauzer et al., 2021, https://doi.org/10.1029/2021pa004218; Mezger et al., 2016, https://doi.org/10.1002/2016pa003052; Wit et al., 2013). To test this new proxy in an open-ocean setting, Na/Ca ratios from the surface-dwelling planktic foraminifera Trilobatus sacculifer were measured from a suite of nine sediment core-tops spanning from the North Atlantic subtropical gyre to the South Atlantic subtropical gyre across a salinity range of 1.6. Results show a positive correlation between habitat salinity (HS) and T. sacculifer Na/Ca (Na/Ca (mmol/mol) = 0.516 (HS (±0.17))  12.934; R2 = 0.81, p < 0.005). We also find no relationship between T. sacculifer Na/Ca and sample size or habitat temperature, indicating Na/Ca is predominantly controlled by salinity. Additionally, we generate the first downcore record of sea surface salinity (SSS) in the Florida Straits over the last deglaciation based on T. sacculifer Na/Ca variability. Results show agreement between our Na/Ca record and a previously published deglacial ´18Osw record that is also thought to reflect SSS variability from the same core (Schmidt & Lynch-Stieglitz, 2011, https://doi.org/10.1029/2011PA002157). Both records indicate an abrupt increase in SSS during the Younger Dryas (11.712.9 kyr). Converting the Florida Straits T. sacculifer Na/Ca ratios to SSS using our new Atlantic core-top calibration indicates a maximum salinity change of <2.2 across the last deglaciation, in agreement with modeling study estimates of salinity change across this period.","pubRank":"1"}],"site":[{"NOAASiteId":"52444","siteName":"KNR166-2-26JPC","siteCode":null,"mappable":"Y","locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean>Gulf Of Mexico","geo":{"geoType":"Feature","geometry":{"type":"POINT","coordinates":["24.326833","-83.252333"]},"properties":{"southernmostLatitude":"24.326833","northernmostLatitude":"24.326833","westernmostLongitude":"-83.252333","easternmostLongitude":"-83.252333","minElevationMeters":"-546","maxElevationMeters":"-546"}},"paleoData":[{"dataTableName":"KNR166-2-26JPC Na/Ca Schmidt2021","NOAADataTableId":"46798","earliestYear":19500,"mostRecentYear":970,"timeUnit":"cal yr 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