{"NOAAStudyId":"8659","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":"2009-09-01","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-8659.xml","doi":null,"earliestYearBP":1950,"earliestYearCE":0,"entryId":"noaa-lake-8659","funding":[],"investigators":"Tiljander, M.; Saarnisto, M.; Ojala, A.E.K.; Saarinen, T.","mostRecentYearBP":-35,"mostRecentYearCE":1985,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/8659","originalSource":null,"publication":[{"abstract":"High-resolution physical analyses (varve thickness and relative X-ray density) were conducted on a 3000-year varved sediment sequence in Lake Korttajarvi, central Finland. Climate and the \r\nlocal environment strongly influence the properties of the lake sediments, and, through a combination of physical proxies, severe and favourable climate periods and anthropogenic effects on sedimentation with an annual to decadal resolution could be detected. We observed previously identified historical climate periods in the Lake Korttajarvi varve record. The Medieval Climate Anomaly (often termed the Medieval Warm Period) of AD 980-1250, \r\nwhich is characterized by highly organic sediment and a minor minerogenic flux during mild winters, started and terminated abruptly, but also included a short (30-year) colder period \r\nlasting between AD 1115 and AD 1145. The Little Ice Age, however, was not clear in our record, although there were two minor cooling periods in AD 1580-1630 and AD 1650-1710. Natural variability in the sediment record was disrupted by increased human impact in\r\nthe catchment area at AD 1720. There is a distinct positive anomaly in mineral matter accumulation between 907 and 875 BC, which indicates more severe climate conditions. This period exists contemporary with a cold event, recorded worldwide, c. 2800 years ago.","author":{"name":"Tiljander, M., M. Saarnisto, A.E.K. Ojala, and T. Saarinen"},"citation":"Tiljander, M., M. Saarnisto, A.E.K. Ojala, and T. Saarinen. 2003. A 3000-year palaeoenvironmental record from annually laminated sediment of Lake Korttajarvi, central Finland. Boreas, 26, 566-577. ","edition":null,"identifier":null,"issue":null,"journal":"Boreas","pages":"566-577","pubRank":"1","pubYear":2003,"reportNumber":null,"title":"A 3000-year palaeoenvironmental record from annually laminated sediment of Lake Korttajarvi, central Finland","type":"publication","volume":"26"}],"reconstruction":"N","scienceKeywords":["PAGES 2k Network","PAGES Arctic 2k"],"site":[{"NOAASiteId":"22956","geo":{"geoType":"Feature","geometry":{"coordinates":["62.33","25.683"],"type":"POINT"},"properties":{"easternmostLongitude":"25.683","maxElevationMeters":"94","minElevationMeters":"94","northernmostLatitude":"62.33","southernmostLatitude":"62.33","westernmostLongitude":"25.683"}},"locationName":"Continent>Europe>Northern Europe>Scandanavia>Finland","mappable":"Y","paleoData":[{"NOAADataTableId":"12535","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/finland/korttajarvi2003.txt","linkText":"korttajarvi2003.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":"x10-4 mm; varve mineral layer thickness","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"millimeter","cvWhat":"physical property>length>varve thickness"},{"cvAdditionalInfo":"x10-4 mm; varve organic layer thickness","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"millimeter","cvWhat":"physical property>length>varve thickness"},{"cvAdditionalInfo":"Measured on a grayscale of 0-255","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"x-ray densitometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"electromagnetic property>absorbance"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/finland/korttajarvi2003.xls","linkText":"korttajarvi2003.xls","urlDescription":"Data","variables":[]}],"dataTableName":"Lake Korttajärvi Core KORTTA","dataTableNotes":null,"earliestYear":1950,"earliestYearBP":1950,"earliestYearCE":0,"mostRecentYear":-35,"mostRecentYearBP":-35,"mostRecentYearCE":1985,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Lake Korttajärvi"}],"studyCode":null,"studyName":"Lake Korttajarvi, Finland 2000 Year Varved Sediment Data","studyNotes":"Sediment varve thickness and X-Ray density data from Lake Korttajarvi, central Finland.","version":"1.0","xmlId":"2289"}