{"NOAAStudyId":"2648","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":"2006-07-01","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-2648.xml","doi":null,"earliestYearBP":5089802,"earliestYearCE":-5087852,"entryId":"noaa-ocean-2648","funding":[],"investigators":"Lawrence, K.T.; Liu, Z.; Herbert, T.D.","mostRecentYearBP":6010,"mostRecentYearCE":-4060,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/2648","originalSource":null,"publication":[{"abstract":"A tropical Pacific climate state resembling that of a permanent El Niņo is hypothesized to have ended as a result of a reorganization of the ocean heat budget ~3 million years ago, a time when large ice sheets appeared in the high latitudes of the Northern Hemisphere. We report a high-resolution alkenone reconstruction of conditions in the heart of the eastern equatorial Pacific (EEP) cold tongue that reflects the combined influences of changes in the equatorial thermocline, the properties of the thermocline's source waters, atmospheric greenhouse gas content, and orbital variations on sea surface temperature (SST) and biological productivity over the past 5 million years. Our data indicate that the intensification of Northern Hemisphere glaciation ~3 million years ago did not interrupt an almost monotonic cooling of the EEP during the Plio-Pleistocene. SST and productivity in the eastern tropical Pacific varied in phase with global ice volume changes at a dominant 41,000-year (obliquity) frequency throughout this time. Changes in the Southern Hemisphere most likely modulated most of the changes observed.","author":{"name":"Lawrence, K.T., Z. Liu and T.D. Herbert"},"citation":"Lawrence, K.T., Z. Liu and T.D. Herbert. 2006. Evolution of the Eastern Tropical Pacific Through Plio-Pleistocene Glaciation. Science, 312, 79-83.","edition":null,"identifier":null,"issue":null,"journal":"Science","pages":null,"pubRank":"1","pubYear":2006,"reportNumber":null,"title":"Evolution of the Eastern Tropical Pacific Through Plio-Pleistocene Glaciation","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["Sea Surface Temperature Reconstruction"],"site":[{"NOAASiteId":"19107","geo":{"geoType":"Feature","geometry":{"coordinates":["-3.095","-90.81833"],"type":"POINT"},"properties":{"easternmostLongitude":"-90.81833","maxElevationMeters":"-3296","minElevationMeters":"-3296","northernmostLatitude":"-3.095","southernmostLatitude":"-3.095","westernmostLongitude":"-90.81833"}},"locationName":"Ocean>Pacific Ocean>South Pacific Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"4374","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>reconstruction","earth science>paleoclimate>paleocean>age control","earth science>paleoclimate>paleocean>biomarkers"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lawrence2006","linkText":"lawrence2006","urlDescription":"Original Data and Full Metadata","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>age control","earth science>paleoclimate>paleocean>reconstruction","earth science>paleoclimate>paleocean>biomarkers"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp846l6-tab.txt","linkText":"odp846l6-tab.txt","urlDescription":"Alternate Format Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>organic compound index>alkenone unsaturation index","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>sea water temperature>sea surface temperature"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"radiocarbon year before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"nanomole per gram","cvWhat":"chemical composition>compound>organic compound>organooxygen compound>ketone>alkenone>C37 alkenone"}]}],"dataTableName":"ODP846L6","dataTableNotes":null,"earliestYear":5089802,"earliestYearBP":5089802,"earliestYearCE":-5087852,"mostRecentYear":5228,"mostRecentYearBP":6010,"mostRecentYearCE":-4060,"species":[],"timeUnit":"14C yr BP"}],"siteName":"ODP 846"}],"studyCode":null,"studyName":"Eastern Equatorial Pacific 5 Myr Alkenone SST and Paleoproductivity Reconstruction","studyNotes":"","version":"1.0","xmlId":"1718"}