{"NOAAStudyId":"2624","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":"2004-07-01","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-2624.xml","doi":null,"earliestYearBP":1833700,"earliestYearCE":-1831750,"entryId":"noaa-ocean-2624","funding":[],"investigators":"Liu, Z.; Herbert, T.D.","mostRecentYearBP":4472,"mostRecentYearCE":-2522,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/2624","originalSource":null,"publication":[{"abstract":"Many records of tropical sea surface temperature and marine productivity exhibit cycles of 23 kyr (orbital precession) and 100 kyr during the past 0.5Myr, whereas high-latitude sea surface temperature records display much more pronounced obliquity cycles at a period of about 41 kyr. Little is known, however, about tropical climate variability before the mid-Pleistocene transition about 900 kyr ago, which marks the change from a climate dominated by 41-kyr cycles (when ice-age cycles and high-latitude sea surface temperature variations were dictated by changes in the Earth?s obliquity) to the more recent 100-kyr cycles of ice ages. Here we analyse alkenones from marine sediments in the eastern equatorial Pacific Ocean to reconstruct sea surface temperatures and marine productivity over the past 1.8Myr. We find that both records are dominated by the 41-kyr obliquity cycles between 1.8 and 1.2Myr ago, with a relatively small contribution from orbital precession, and that early Pleistocene sea surface temperatures varied in the opposite sense to local annual insolation in the eastern equatorial Pacific Ocean. We conclude that during the early Pleistocene epoch, climate variability at our study site must have been determined by high-latitude processes that were driven by orbital obliquity forcing.","author":{"name":"Liu, Z. and T.D. Herbert"},"citation":"Liu, Z. and T.D. Herbert. 2004. High-latitude influence on the eastern equatorial Pacific climate in the early Pleistocene epoch. Nature, Vol. 427, No.6976, 720-723.","edition":null,"identifier":{"id":"10.1038/nature02338","type":"doi","url":"http://dx.doi.org/10.1038/nature02338"},"issue":null,"journal":"Nature","pages":null,"pubRank":"1","pubYear":2004,"reportNumber":null,"title":"High-latitude influence on the eastern equatorial Pacific climate in the early Pleistocene epoch","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":"4320","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>other","earth science>paleoclimate>paleocean>biomarkers","earth science>paleoclimate>paleocean>reconstruction","earth science>paleoclimate>paleocean>age control"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/liu2004","linkText":"liu2004","urlDescription":"Original Data and Full Metadata","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>biomarkers","earth science>paleoclimate>paleocean>reconstruction","earth science>paleoclimate>paleocean>other","earth science>paleoclimate>paleocean>age control"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp846-l-tab.txt","linkText":"odp846-l-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"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":"composited","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"}]}],"dataTableName":"ODP846-L","dataTableNotes":"Depth is a revised composite depth. Uncertainty of measurements in terms of SST is 0.2 C and in terms of alkenone contents is 5%. Age model is based on Mix et al. (1995, Benthic foraminerferal stable isotope stratigraphy of Site 846: 0-1.8 Ma, Scientific ","earliestYear":1833700,"earliestYearBP":1833700,"earliestYearCE":-1831750,"mostRecentYear":4000,"mostRecentYearBP":4472,"mostRecentYearCE":-2522,"species":[],"timeUnit":"14C yr BP"}],"siteName":"ODP 846"}],"studyCode":null,"studyName":"Eastern Pacific Pleistocene Alkenone Data and SST Reconstruction","studyNotes":"","version":"1.0","xmlId":"1695"}