{"NOAAStudyId":"10355","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":"2011-01-05","dataPublisher":"NOAA","dataType":"CLIMATE RECONSTRUCTIONS","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/climate-reconstruction","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-recon-10355.xml","doi":null,"earliestYearBP":3202320,"earliestYearCE":-3200370,"entryId":"noaa-recon-10355","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE0623310"},{"fundingAgency":"Ocean Drilling Program","fundingGrant":"Schlanger Fellowship"}],"investigators":"Lawrence, K.T.; Sosdian, S.M.; White, H.E.; Rosenthal, Y.","mostRecentYearBP":247830,"mostRecentYearCE":-245880,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/10355","originalSource":null,"publication":[{"abstract":"During the Plio-Pleistocene, the Earth witnessed the growth of large \nnorthern hemisphere ice sheets and profound changes in both North \nAtlantic and global climate. Here, we present a ~3.2 Myr long, \norbitally-resolved alkenone sea surface temperature (SST) record \nfrom Deep Sea Drilling Project (DSDP) Site 607 (41°N, 33°W, water \ndepth 3427 m) in the North Atlantic Ocean. We employ a multi-proxy \napproach comparing these new observations with existing bottom water \ntemperature (BWT) and stable isotope time series from the same site \nand SST time series from other sites, shedding new light on \nPlio-Pleistocene climate change. North Atlantic temperature records \nshow a long-term cooling with two major steps occurring during the \nlate Pliocene (3.1 to 2.4 Ma) and the mid-Pleistocene (1.5 to 0.8 Ma), \nclosely timed with intervals of major change in northern hemisphere \nice sheets. Existing evidence suggests that the late Pliocene cooling \nmay have been caused by a thresholded response to secular changes \nin atmospheric carbon dioxide (CO2). While an explanation for the \nmid-Pleistocene cooling may involve glacial-interglacial changes \nin atmospheric CO2, it seems to also require a change in the behavior \nof the ice sheets themselves. North Atlantic climate responses were \nclosely phased with benthic oxygen isotope (d18O) changes during the \n\"41 kyr world,\" indicating a strong common northern hemisphere high \nlatitude imprint on North Atlantic climate signals. After the mid-\nPleistocene transition (MPT), North Atlantic SST records and the \nSite 607 benthic carbon isotope (d13C) record are more closely \nphased with d18O, whereas BWT significantly leads d18O in the \n100 kyr band, suggesting a shift from a northern to a southern \nhemisphere influence on North Atlantic BWT. We propose that the\nexpansion of the West Antarctic ice sheet (WAIS) across the MPT \nincreased the production and export of Antarctic Bottom Water \nfrom the Southern Ocean and subsequently controlled its incursion \ninto the North Atlantic, especially during glacial intervals. \nIt follows that the early 100 kyr response of BWT implies an \nearly response of the WAIS relative to the northern hemisphere \ndeglaciation. Thus, in the \"100 kyr world,\" both northern \nhemisphere and southern hemisphere processes affect climate \nconditions in the North Atlantic Ocean.\n\n","author":null,"citation":"Lawrence, K.T., S. Sosdian, H.E. White, and Y. Rosenthal. 2010. \nNorth Atlantic climate evolution through the Plio-Pleistocene \nclimate transitions. \nEarth and Planetary Science Letters, Vol. 300, Issues 3-4, \n1 December 2010, pp. 329-342. \ndoi:10.1016/j.epsl.2010.10.013","edition":null,"identifier":{"id":"10.1016/j.epsl.2010.10.013","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2010.10.013"},"issue":null,"journal":"Earth and Planetary Science Letters","pages":null,"pubRank":"1","pubYear":2010,"reportNumber":null,"title":"North Atlantic climate evolution through the Plio-Pleistocene  climate transitions","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["Sea Surface Temperature Reconstruction"],"site":[{"NOAASiteId":"30611","geo":{"geoType":"Feature","geometry":{"coordinates":["41.000019","-32.950122"],"type":"POINT"},"properties":{"easternmostLongitude":"-32.950122","maxElevationMeters":"-3427","minElevationMeters":"-3427","northernmostLatitude":"41.000019","southernmostLatitude":"41.000019","westernmostLongitude":"-32.950122"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"19127","coreLengthMeters":135,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>sea surface temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lawrence2010/lawrence2010.txt","linkText":"lawrence2010.txt","urlDescription":"Original Data and Full Metadata","variables":[{"cvAdditionalInfo":"Site Section Interval (cm)","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>sample identification"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar kiloyear before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"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":"dimensionless","cvWhat":"chemical composition>compound>organic compound>organic compound index>alkenone unsaturation index>alkenone unsaturation index Uk37 prime"}]},{"NOAAKeywords":["earth science>paleoclimate>reconstructions>sea surface temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lawrence2010/lawrence2010.xls","linkText":"lawrence2010.xls","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"DSDP607H","dataTableNotes":null,"earliestYear":3202320,"earliestYearBP":3202320,"earliestYearCE":-3200370,"mostRecentYear":247830,"mostRecentYearBP":247830,"mostRecentYearCE":-245880,"species":[],"timeUnit":"cal yr BP"}],"siteName":"DSDP 607"}],"studyCode":null,"studyName":"North Atlantic DSDP607 Plio-Pleistocene Alkenone SST Reconstructions ","studyNotes":"This dataset consists of North Atlantic Alkenone Sea Surface \nTemperature estimates from DSDP Site 607 from 3.2 Ma to 0.25 Ma \nat ~3-4 kyr resolution. Alkenones are lipid compounds created by \na few species of ocean surface dwelling algae. The alkenone \nunsaturation index (Uk'37 = [C37:2]/[C37:2] + [C37:3]) has been \nlinearly calibrated to organism growth temperature and thus has \nbeen used as a means of estimating past ocean surface temperatures \n[Brassell, et al., 1986; Prahl and Wakeham, 1987]. We use the \nPrahl et al. [1988] calibration to generate estimates of past \nsea surface temperatures.  \n","version":"1.0","xmlId":"9011"}