{"NOAAStudyId":"5947","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":"2007-01-01","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-5947.xml","doi":null,"earliestYearBP":-50,"earliestYearCE":2000,"entryId":"noaa-ocean-5947","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE-0214221, OCE-0221979, OCE-0425522"}],"investigators":"Marchitto, T.M.","mostRecentYearBP":-60,"mostRecentYearCE":2010,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/5947","originalSource":null,"publication":[{"abstract":"Inductively coupled plasma mass spectrometry (ICP-MS) holds two main advantages over other techniques for the measurement of foraminiferal elemental ratios: (1) numerous trace metals may be precisely and simultaneously measured, and (2) smaller samples may theoretically be used. Methods are presented for the precise determination of Mg/Ca, Sr/Ca, Cd/Ca, Zn/Ca, Li/Ca, U/Ca, Mn/Ca, and Fe/Ca by sector field ICP-MS.  Analytical precision is largely independent of sample size over the range of ~5 to 125 ug CaCO3, eliminating the need for narrow target dilutions. Long-term 1 sigma precisions are as follows: Mg/Ca = 0.54%, Sr/Ca = 0.57%, Cd/Ca = 1.8%, Zn/Ca = 3.2%, Li/Ca = 0.88%, U/Ca = 1.9%, Mn/Ca = 0.97%, and Fe/Ca = 1.4%. For Mg/Ca, actual foraminiferal samples appear to give reliable results below 10 ug CaCO3 (postcleaning mass).","author":null,"citation":"Marchitto, T.M. 2007. Precise multielemental ratios in small foraminiferal samples determined by sector field ICP-MS. Geochem. Geophys. Geosyst., 7, Q05P13. doi:10.1029/2005GC001018.","edition":null,"identifier":null,"issue":null,"journal":"Geochemistry, Geophysics, Geosystems","pages":null,"pubRank":"1","pubYear":2007,"reportNumber":null,"title":"Precise multielemental ratios in small foraminiferal samples determined by sector field ICP-MS","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"22723","geo":{"geoType":"Feature","geometry":{"coordinates":["-90","90","-180","180"],"type":"POLYGON"},"properties":{"easternmostLongitude":"180","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"90","southernmostLatitude":"-90","westernmostLongitude":"-180"}},"locationName":"Geographic Region>Global","mappable":"N","paleoData":[{"NOAADataTableId":"33058","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/marchitto2006/marchitto2006.txt","linkText":"marchitto2006.txt","urlDescription":"Original Data and Full Metadata","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/marchitto2006/marchitto2006.xls","linkText":"marchitto2006.xls","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"Marchitto2006","dataTableNotes":null,"earliestYear":-50,"earliestYearBP":-50,"earliestYearCE":2000,"mostRecentYear":-60,"mostRecentYearBP":-60,"mostRecentYearCE":2010,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Global"}],"studyCode":null,"studyName":"Marchitto 2006 Precise Sector Field ICP-MS Foram Multi-Elemental Ratios","studyNotes":"46Ca/43Ca count ratios were blank-corrected and normalized to bring \nmean of standards in each run to 2.6.    \nMetal/Ca deviations were calculated as (Me/Ca)meas/(Me/Ca)known - 1. \nOutliers are 2s relative to linear equations through all data.    \nFinal sample masses were calculated from measured [Ca].  \n\nVARIABLES AND UNITS:    \n46Ca/43Ca count ratios (%)    \nCa concentrations (mM)    \nMetal/Ca deviations from known (ratio-1)    \nG. bulloides Mg/Ca (mmol/mol)    \nsample size as mass CaCO3 (ug)  \n\nPRECISION:    \nMg/Ca: 0.54%    \nSr/Ca: 0.57%    \nCd/Ca: 1.8%    \nZn/Ca: 3.2%    \nLi/Ca: 0.88%    \nU/Ca: 1.9%    \nMn/Ca: 0.97%  \n","version":"1.0","xmlId":"3116"}