{"NOAAStudyId":"6200","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":"2008-11-01","dataPublisher":"NOAA","dataType":"PALEOLIMNOLOGY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/lake","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-6200.xml","doi":null,"earliestYearBP":2652,"earliestYearCE":-702,"entryId":"noaa-lake-6200","funding":[],"investigators":"Peros, M.C.; Gajewski, K.J.","mostRecentYearBP":-56,"mostRecentYearCE":2006,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/6200","originalSource":null,"publication":[{"abstract":"Two lake-sediment cores from the western and central Canadian Arctic \r\nwere used to investigate late Holocene climate variability in the region. \r\nBoth cores were analyzed for pollen, organic matter, biogenic silica, \r\nand magnetic susceptibility, and were dated using a combination of 210Pb \r\nand 14C techniques. Core MB01, from southwestern Victoria Island, \r\nprovides a 2600-year-long record.  Fossil pollen percentages, along with \r\nother parameters, suggest the occurrence of a cold period around \r\n2400 cal year BP (450 BC), followed by slightly warmer conditions \r\nby 1800 cal year BP (150 AD), and a return to cooler conditions throughout \r\nmuch of the last millennium.  Core SL06, from southern Boothia Peninsula, \r\nshows more subtle changes in pollen percentages over its 2500-year duration, \r\nbut an increase in Cyperaceae and decrease in Oxyria pollen around 1400 \r\ncal year BP (550 AD) are indicative of warmer conditions at that time. \r\nQuantitative climate reconstructions from these pollen sequences were \r\ncompared to two other pollen-based climate records from the region \r\nand indicate the presence of a widespread wet period ~1500 cal year BP \r\n(450 AD), and a cool and dry Little Ice Age. In the reconstructions \r\nbased on pollen percentage data, the twentieth century summer temperature \r\nand annual precipitation in the central and western Canadian Arctic were \r\ncomparable to that which occurred over the last 2500 years. However, \r\npollen-influx values increase in the most recent sediments, suggesting \r\nhigh plant productivity during the late twentieth century.\r\n","author":{"name":"Peros, M.C. and K. Gajewski"},"citation":"Peros, M.C. and K. Gajewski. 2009. Pollen-based reconstructions of late Holocene climate from the central and western Canadian Arctic. Journal of Paleolimnology, 41(1), 161-175. doi: 10.1007/s10933-008-9256-9","edition":null,"identifier":{"id":"10.1007/s10933-008-9256-9","type":"doi","url":"http://dx.doi.org/10.1007/s10933-008-9256-9"},"issue":"1","journal":"Journal of Paleolimnology","pages":"161-175","pubRank":"1","pubYear":2009,"reportNumber":null,"title":"Pollen-based reconstructions of late Holocene climate from the central and western Canadian Arctic","type":"publication","volume":"41"}],"reconstruction":"Y","scienceKeywords":["PAGES Arctic 2k","PAGES 2k Network","Precipitation Reconstruction","Air Temperature Reconstruction"],"site":[{"NOAASiteId":"20676","geo":{"geoType":"Feature","geometry":{"coordinates":["69.806","-112.075"],"type":"POINT"},"properties":{"easternmostLongitude":"-112.075","maxElevationMeters":"290","minElevationMeters":"290","northernmostLatitude":"69.806","southernmostLatitude":"69.806","westernmostLongitude":"-112.075"}},"locationName":"Continent>North America>Canada>Nunavut","mappable":"Y","paleoData":[{"NOAADataTableId":"9521","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.txt","linkText":"nunavut2008.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"loss on ignition","cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"biological material>bulk biological material>organic matter"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"loss on ignition","cvSeasonality":null,"cvShortName":null,"cvUnit":"milligram per square centimeter per year","cvWhat":"biological material>bulk biological material>organic matter"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"milligram per square centimeter per year","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless (SI system)","cvWhat":"magnetic property>magnetic moments>magnetic susceptibility"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.xls","linkText":"nunavut2008.xls","urlDescription":"Data","variables":[]}],"dataTableName":"Lake MB01 Core MB01","dataTableNotes":null,"earliestYear":2652,"earliestYearBP":2652,"earliestYearCE":-702,"mostRecentYear":-50,"mostRecentYearBP":-50,"mostRecentYearCE":2000,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Lake MB01"},{"NOAASiteId":"56266","geo":{"geoType":"Feature","geometry":{"coordinates":["68.5893","-91.8922"],"type":"POINT"},"properties":{"easternmostLongitude":"-91.8922","maxElevationMeters":"243","minElevationMeters":"243","northernmostLatitude":"68.5893","southernmostLatitude":"68.5893","westernmostLongitude":"-91.8922"}},"locationName":"Continent>North America>Canada>Nunavut","mappable":"Y","paleoData":[{"NOAADataTableId":"27318","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.txt","linkText":"nunavut2008.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"loss on ignition","cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"biological material>bulk biological material>organic matter"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"loss on ignition","cvSeasonality":null,"cvShortName":null,"cvUnit":"milligram per square centimeter per year","cvWhat":"biological material>bulk biological material>organic matter"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"milligram per square centimeter per year","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless (SI system)","cvWhat":"magnetic property>magnetic moments>magnetic susceptibility"}]},{"NOAAKeywords":["earth 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