{"NOAAStudyId":"8702","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-8702.xml","doi":null,"earliestYearBP":288440,"earliestYearCE":-286490,"entryId":"noaa-ocean-8702","funding":[],"investigators":"Crosta, X.; Sturm, A.; Armand, L.; Pichon, J.-J.","mostRecentYearBP":3220,"mostRecentYearCE":-1270,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/8702","originalSource":null,"publication":[{"abstract":"A Modern Analog Technique (MAT5201/31) has been applied to fossil diatom assemblages to provide down-core\r\nestimates of February sea-surface temperatures (SSTs) and of sea ice duration over the past 220 000 years at 56‡40PS,\r\n160‡14PE. At the core location, sea ice progression lagged the SST drop by V1 ka at interglacial^glacial transitions,\r\nand sea ice retreat was almost synchronous to the SST increase at glacial^interglacial terminations. Sea ice increased\r\ncontinuously during glacial periods to reach its maximum extent at the end of glacial times, although SSTs were\r\nalmost constant during glacials. This indicates that SSTs are the major parameter determining the advance and retreat\r\nof sea ice at transitions, but that the sea ice advance during glacial conditions may be related to positive feedbacks of\r\nthe ice on albedo, air temperature and meridional wind stress. The strong correlation (r =0.75) between sea ice\r\nduration at the core location and the Vostok CO2 record argues for a control of Antarctic sea ice extent on\r\natmospheric CO2 concentration via the modification of the ocean-to-atmosphere gas balance.","author":{"name":"Crosta, X., A. Sturm, L. Armand, and J.-J. Pichon"},"citation":"Crosta, X., A. Sturm, L. Armand, and J.-J. Pichon. 2004. Late Quaternary sea ice history in the Indian sector of the Southern Ocean as recorded by diatom assemblages. Marine Micropaleontology, 50, 209-223. doi: 10.1016/S0377-8398(03)00072-0","edition":null,"identifier":{"id":"10.1016/S0377-8398(03)00072-0","type":"doi","url":"http://dx.doi.org/10.1016/S0377-8398(03)00072-0"},"issue":null,"journal":"Marine Micropaleontology","pages":"209-223","pubRank":"1","pubYear":2004,"reportNumber":null,"title":"Late Quaternary sea ice history in the Indian sector of the Southern Ocean as recorded by diatom assemblages","type":"publication","volume":"50"}],"reconstruction":"Y","scienceKeywords":["Sea Surface Temperature Reconstruction","Sea Ice Reconstruction"],"site":[{"NOAASiteId":"19153","geo":{"geoType":"Feature","geometry":{"coordinates":["-56.67","160.23"],"type":"POINT"},"properties":{"easternmostLongitude":"160.23","maxElevationMeters":"-3912","minElevationMeters":"-3912","northernmostLatitude":"-56.67","southernmostLatitude":"-56.67","westernmostLongitude":"160.23"}},"locationName":"Ocean>Pacific Ocean>South Pacific Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"34873","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>reconstruction"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/crosta2004/crosta2004.txt","linkText":"crosta2004.txt","urlDescription":"Original Data and Full Metadata","variables":[{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>biological assemblage>diatom assemblage","cvMethod":null,"cvSeasonality":"1-month period>Feb","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>sea water temperature>sea surface temperature"},{"cvAdditionalInfo":"month per year","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>biological assemblage>diatom 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Group","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"biological material>organism>diatom>identified diatom"},{"cvAdditionalInfo":"Diatom SAZ (Subantarctic Zone) Group","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"biological material>organism>diatom>identified diatom"},{"cvAdditionalInfo":"Eucampia antarctica","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"biological material>organism>diatom>identified diatom"},{"cvAdditionalInfo":"Extinct diatoms","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"biological material>organism>diatom>identified diatom"},{"cvAdditionalInfo":"Hemidiscus karstenii","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"biological material>organism>diatom>identified diatom"}]}],"dataTableName":"SO136-111 Crosta2004","dataTableNotes":null,"earliestYear":288440,"earliestYearBP":288440,"earliestYearCE":-286490,"mostRecentYear":3220,"mostRecentYearBP":3220,"mostRecentYearCE":-1270,"species":[],"timeUnit":"cal yr BP"}],"siteName":"SO136-111"}],"studyCode":null,"studyName":"Crosta et al. 2004 Southern Ocean Diatom SST-Sea Ice Recons","studyNotes":null,"version":"1.0","xmlId":"2735"}