{"NOAAStudyId":"8453","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":"2007-07-01","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-8453.xml","doi":null,"earliestYearBP":10843,"earliestYearCE":-8893,"entryId":"noaa-ocean-8453","funding":[],"investigators":"Crosta, X.; Debret, M.; Denis, D.; Courty, M.A.; Ther, O.","mostRecentYearBP":1000,"mostRecentYearCE":950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/8453","originalSource":null,"publication":[{"abstract":"Diatom data from a marine sediment core give insight on Holocene changes in sea-surface conditions and climate at high southern latitudes off Adélie Land, East Antarctica. The early to mid-Holocene was warmer than the late Holocene with a transition at ~4000 calendar years B. P. Sea ice was less present and spring-summer growing season was greater during the warm period relative to the cold one, thus limiting sea ice diatom production and favoring more open ocean diatom to develop. The long-term Holocene climatic evolution in East Antarctica is explained by a combination of a delayed response to local seasonal insolation changes coupled to the long memory of the Southern Ocean. Abrupt variations of the diatom relative abundances, indicating rapid climate changes, are superimposed to the Holocene long-term trends. Spectral analyses calculate robust frequencies at ~1600 a (where ŋaŋ is years), ~1250 a, ~1050 a, ~570 a, ~310 a, ~230 a, ~150ŋ125 a, ~110 a, ~90 a, and ~66 a. Such periods are very close to solar activity cyclicities, except for the periods at ~310 a and ~1250 a, which are close to internal climate variability cyclicities. Wavelet analyses estimate the same periods but indicate nonstationary cyclicities. Rapid climate changes at high southern latitudes may therefore be explained by a combination of external (solar) and internal (thermohaline circulation) forcings.","author":null,"citation":"Crosta, X., M. Debret, D. Denis, M. A. Courty, and O. Ther. 2007. Holocene long- and short-term climate changes off Adélie Land, East Antarctica. Geochem. Geophys. Geosyst., 8, Q11009.","edition":null,"identifier":null,"issue":null,"journal":"Geochemistry, Geophysics, Geosystems","pages":null,"pubRank":"1","pubYear":2007,"reportNumber":null,"title":"Holocene long- and short-term climate changes off Adélie Land, East Antarctica","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"22751","geo":{"geoType":"Feature","geometry":{"coordinates":["-66.051","138.557"],"type":"POINT"},"properties":{"easternmostLongitude":"138.557","maxElevationMeters":"-746","minElevationMeters":"-746","northernmostLatitude":"-66.051","southernmostLatitude":"-66.051","westernmostLongitude":"138.557"}},"locationName":"Continent>Antarctica","mappable":"Y","paleoData":[{"NOAADataTableId":"12245","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>population abundance","earth science>paleoclimate>paleocean>age control"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/crosta2007","linkText":"crosta2007","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"MD03-2601","dataTableNotes":null,"earliestYear":10843,"earliestYearBP":10843,"earliestYearCE":-8893,"mostRecentYear":1000,"mostRecentYearBP":1000,"mostRecentYearCE":950,"species":[],"timeUnit":"cal yr BP"}],"siteName":"MD03-2601"}],"studyCode":null,"studyName":"Adélie Land, East Antarctica Holocene Diatom Abundance Data","studyNotes":"","version":"1.0","xmlId":"2590"}