noaa-lake-8659 Lake Korttajarvi, Finland 2000 Year Varved Sediment Data Tiljander, M.; Saarnisto, M.; Ojala, A.E.K.; Saarinen, T. Lake Korttajarvi, Finland 2000 Year Varved Sediment Data 2009-09-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/8659 Investigator M. Tiljander Investigator M. Saarnisto Investigator A.E.K. Ojala Investigator T. Saarinen earth science paleoclimate paleolimnology varve thickness,null,null,millimeter,null,paleolimnology,null,null,N,x10-4 mm; varve mineral layer thickness earth science paleoclimate paleolimnology age,null,null,year Common Era,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology varve thickness,null,null,millimeter,null,paleolimnology,null,null,N,x10-4 mm; varve organic layer thickness earth science paleoclimate paleolimnology absorbance,null,null,dimensionless,null,paleolimnology,null,x-ray densitometry,N,Measured on a grayscale of 0-255 earth science paleoclimate paleolimnology physical properties geoscientificInformation PAGES 2k Network PAGES Arctic 2k 1950 cal yr BP -35 cal yr BP Complete 62.33 62.33 25.683 25.683 94 94 Continent Europe Northern Europe Scandanavia Finland Lake Korttajärvi>LATITUDE 62.33>LONGITUDE 25.683 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Tiljander, M., M. Saarnisto, A.E.K. Ojala, and T. Saarinen 2003 Boreas 26 566-577

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 local 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, which 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 lasting 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 the 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. STUDY NOTES: Sediment varve thickness and X-Ray density data from Lake Korttajarvi, central Finland.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/finland/korttajarvi2003.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/finland/korttajarvi2003.xls USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11