{"NOAAStudyId":"10528","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":"2011-02-21","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-10528.xml","doi":null,"earliestYearBP":488300,"earliestYearCE":-486350,"entryId":"noaa-ocean-10528","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"0526522"}],"investigators":"Hayes, C.T.; Anderson, R.F.; Fleisher, M.Q.","mostRecentYearBP":0,"mostRecentYearCE":1950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/10528","originalSource":null,"publication":[{"abstract":"A possible imprint on equatorial Pacific sediments of a deglacial \r\nreinvigoration of the Southern Ocean overturning is increased \r\nopal accumulation rate. This would arise from the transmission \r\nof silica-rich deep water to the equatorial thermocline via \r\nSubantarctic Mode Water and an associated increase in diatom \r\nproductivity. In search of this imprint, sediment cores from \r\nthe central (TT013-PC72) and eastern (V19-30) equatorial Pacific \r\nhave been analyzed for 230Th-normalized opal accumulation rates \r\nover the past five and three glacial terminations, respectively. \r\nEquatorial opal accumulation rates sustained relatively low values \r\nover much of the records and were punctuated by large increases \r\ncentered on some terminations, but not all.  Furthermore, two \r\nperiods of increased opal flux were observed that do not coincide \r\nwith terminations.  Sources other than the Southern Ocean may need \r\nto be considered in the silica budget of the equatorial Pacific, \r\nbut the d13C of Neogloboquadrina dutertrei can be used to support \r\nthe presence of a deepwater nutrient signal in each case. \r\nAlthough a common deglacial mechanism, or a common imprint thereof, \r\nfor each of the late Pleistocene glaciations remains elusive, \r\nthe combination of opal flux and d13C of N. dutertrei provides \r\na diagnostic for past injection of deepwater nutrients into \r\nthe Equatorial Undercurrent.","author":{"name":"Hayes, C.T., R.F. Anderson, and M.Q. Fleisher"},"citation":"Hayes, C.T., R.F. Anderson, and M.Q. Fleisher. 2011. \r\nOpal accumulation rates in the equatorial Pacific \r\nand mechanisms of deglaciation. \r\nPaleoceanography, 26, PA1207, doi:10.1029/2010PA002008","edition":null,"identifier":{"id":"10.1029/2010PA002008 ","type":"doi","url":"http://dx.doi.org/10.1029/2010PA002008 "},"issue":null,"journal":"Paleoceanography","pages":null,"pubRank":"1","pubYear":2011,"reportNumber":null,"title":"Opal accumulation rates in the equatorial Pacific  and mechanisms of deglaciation","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["Meridional Overturning Circulation (MOC)"],"site":[{"NOAASiteId":"17946","geo":{"geoType":"Feature","geometry":{"coordinates":["-3","-83"],"type":"POINT"},"properties":{"easternmostLongitude":"-83","maxElevationMeters":"-3091","minElevationMeters":"-3091","northernmostLatitude":"-3","southernmostLatitude":"-3","westernmostLongitude":"-83"}},"locationName":"Ocean>Pacific Ocean>South Pacific 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concentration>230Th"},{"cvAdditionalInfo":"opal(%)*230Th-norm flux","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"gram per square centimeter per kiloyear","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"}]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hayes2011/hayes2011.xls","linkText":"hayes2011.xls","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"V19-30H","dataTableNotes":null,"earliestYear":254790,"earliestYearBP":254790,"earliestYearCE":-252840,"mostRecentYear":0,"mostRecentYearBP":0,"mostRecentYearCE":1950,"species":[],"timeUnit":"cal yr BP"}],"siteName":"V19-30"},{"NOAASiteId":"19139","geo":{"geoType":"Feature","geometry":{"coordinates":[".1","-139.4"],"type":"POINT"},"properties":{"easternmostLongitude":"-139.4","maxElevationMeters":"-4298","minElevationMeters":"-4298","northernmostLatitude":"0.1","southernmostLatitude":"0.1","westernmostLongitude":"-139.4"}},"locationName":"Ocean>Pacific Ocean>North Pacific Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"19326","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hayes2011/hayes2011.txt","linkText":"hayes2011.txt","urlDescription":"Original Data and Full Metadata","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological 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concentration>230Th"},{"cvAdditionalInfo":"opal(%)*230Th-norm flux","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"gram per square centimeter per kiloyear","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar kiloyear before present","cvWhat":"age variable>age"}]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hayes2011/hayes2011.xls","linkText":"hayes2011.xls","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"TT013-PC72H","dataTableNotes":null,"earliestYear":488300,"earliestYearBP":488300,"earliestYearCE":-486350,"mostRecentYear":5000,"mostRecentYearBP":5000,"mostRecentYearCE":-3050,"species":[],"timeUnit":"cal yr BP"}],"siteName":"TT013-PC72"}],"studyCode":null,"studyName":"Equatorial Pacific Late Pleistocene Sediment Accumulation Rate Data","studyNotes":"NOTES:    \nData from TT013-PC72 reported here combine previously reported results \nwith new data for the convenience of comparison. This compilation was done \nwith data reports from Bradtmiller et al. (2006) and Anderson et al. (2008). \n    \nData from V19-30 also combines new data with those reported by \nBradtmiller et al. (2006). \n    \nData from both Bradtmiller et al. (2006) and Anderson et al. (2008) \nhave been updated to incorporate a more accurate half life of Th-230 \nfrom 75,200 yrs to 75,690 years (Cheng et al. 2000). \n    \nAge Models:    \nIn the case of PC72, we used the age model of Murray et al. (2000) \nas modified in the upper meter based on C-14 data of Anderson et al. (2008). \nFor V19-30, we used the age model from Shackelton et al. (1983). \n\n\nEXPLANATION OF DERIVED PARAMETERS:    \nxs230Th o and xs231Pa o    \nxs230Th o and xs231Pa o refer to the measured value as corrected for     \ningrowth of 230Th (or 231Pa) from sedimentary and detrital uranium.      \nThese values are calculated using measured concentrations of 230Th     \n(and 231Pa), 232Th and 238U, and assuming that all 232Th is detrital     \nin nature.  It also assumes a detrital U/Th ratio, which varies by region.    \nConcentrations are finally corrected for decay since deposition.    \nxs(Pa/Th)o    \nThe initial xs231Pa/xs230Th ratio refers to the ratio of xs230Th     \nand xs231Pa after both have been decay corrected using their     \nrespective half-lives.     \n    \n230Th-norm flux (g/cm^2/kyr) --230Th-normalized mass accumulation rate (or flux)    \nFor a discussion of this proxy and the relevant corrections and parameters, \nplease see Francois et al. (2004)\n    \nF(opal) (g/cm^2/kyr) ---230Th-normalized opal accumulation rate (or flux) \n= opal(%)*230Th-norm flux  \n  \n","version":"1.0","xmlId":"9192"}