{"NOAAStudyId":"25410","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":"2018-10-12","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-25410.xml","doi":null,"earliestYearBP":10000,"earliestYearCE":-8050,"entryId":"noaa-ocean-25410","funding":[{"fundingAgency":"Shell Oil Company","fundingGrant":null},{"fundingAgency":"Geological Society of America","fundingGrant":"Graduate Student Research Grant"},{"fundingAgency":"University of Wisconsin-Madison, Geoscience Department","fundingGrant":"-Madison, Geoscience Department #    Grant:"}],"investigators":"Wycech, J.; Kelly, D.C.; Kitajima, K.; Kozdon, R.; Orland, I.J.; Valley, J.W.","mostRecentYearBP":0,"mostRecentYearCE":1950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/25410","originalSource":null,"publication":[{"abstract":"Oxygen isotope ratios (d18O) measured from planktic foraminifer shells are commonly used to reconstruct past surface-ocean conditions, yet the shells of many planktic foraminifers are an aggregate mixture of multiple carbonate phases with differing d18O compositions. Here we demonstrate how secondary ion mass spectrometry (SIMS) can be used to measure intra-shell d18O heterogeneity by performing in situ analyses on micrometer-scale (3-10 μm) domains within individual shells of the extant, mixed layer species Trilobatus sacculifer. SIMS measurements on shells taken from Holocene-aged sediments at three sites in different ocean basins confirm that the d18O of gametogenic (GAM) calcite added to shells during the terminal (reproductive) stage of the life cycle is 1.0-1.4‰ higher than that of pre-gametogenic (PREGAM) calcite. Examination of shells in cross-section reveals that many have suffered varying degrees of internal dissolution, which further skews whole-shell d18O compositions toward higher values by preferentially removing low d18O PREGAM calcite. The results of this study echo the calls of earlier studies cautioning that spatiotemporal changes in the proportion of high d18O GAM calcite should be considered when assessing T. sacculifer d18O records generated via conventional isotope ratio mass spectrometry.","author":{"name":"Wycech, J.B., Kelly, D.C., Kitajima, K., Kozdon, R., Orland, I.J., and Valley, J.W."},"citation":"Wycech, J.B., Kelly, D.C., Kitajima, K., Kozdon, R., Orland, I.J., and Valley, J.W. 2018. Combined Effects of Gametogenic Calcification and Dissolution on d18O Measurements of the Planktic Foraminifer Trilobatus sacculifer. Geochemistry, Geophysics, Geosystems, 18(2), 1-15. doi: 10.1029/2018GC007908","edition":null,"identifier":{"id":"10.1029/2018GC007908","type":"doi","url":"http://dx.doi.org/10.1029/2018GC007908"},"issue":"2","journal":"Geochemistry, Geophysics, Geosystems","pages":"1-15","pubRank":"1","pubYear":2018,"reportNumber":null,"title":"Combined Effects of Gametogenic Calcification and Dissolution on d18O Measurements of the Planktic Foraminifer Trilobatus sacculifer","type":"publication","volume":"18"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"57841","geo":{"geoType":"Feature","geometry":{"coordinates":[".066667","31.9282","-75.7296","159.361"],"type":"POLYGON"},"properties":{"easternmostLongitude":"159.361","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"31.9282","southernmostLatitude":"0.066667","westernmostLongitude":"-75.7296"}},"locationName":"Geographic Region>Global Ocean","mappable":"N","paleoData":[{"NOAADataTableId":"38553","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wycech2018/wycech2018.txt","linkText":"Trilobatus sacculifer Data","urlDescription":"NOAA Template File","variables":[]}],"dataTableName":"CTSedTrap-isotopes Wycech2018","dataTableNotes":"Age range from <10000 cal yr BP to Present","earliestYear":10000,"earliestYearBP":10000,"earliestYearCE":-8050,"mostRecentYear":0,"mostRecentYearBP":0,"mostRecentYearCE":1950,"species":[],"timeUnit":"cal yr BP"}],"siteName":"PC9, 806, A2, and EqPac"}],"studyCode":null,"studyName":"Measurements of d18O on the Planktic Foraminifer Trilobatus sacculifer from different ocean basins","studyNotes":"Provided Keywords: paleoceanography, foraminifera, oxygen isotopes, ion microprobe","version":"1.0","xmlId":"23594"}