noaa-lake-22194 Lake Kalliojärvi, Finland 4,000 Year Varve Thickness Data Saarni, S.; Saarinen, T.; Dulski, P. Lake Kalliojärvi, Finland 4,000 Year Varve Thickness Data 2017-06-06 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22194 Investigator S. Saarni Investigator T. Saarinen Investigator P. Dulski earth science paleoclimate paleolimnology absorbance,sediment,null,dimensionless,null,paleolimnology,raw,x-ray densitometry,N,Light sum (accumulation of minerogenic clasts) - summation of the area below the x-ray density curve in grayscale values for each varve earth science paleoclimate paleolimnology depth,null,null,millimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology varve thickness,null,null,millimeter,null,paleolimnology,raw,null,N,null earth science paleoclimate paleolimnology age,null,null,year Common Era,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology physical properties geoscientificInformation -2183 AD 1900 AD 4133 cal yr BP 50 cal yr BP Complete 63.227 63.227 25.366 25.366 121 121 Continent Europe Northern Europe Scandanavia Finland Lake Kalliojärvi>LATITUDE 63.227>LONGITUDE 25.366 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 Saija Saarni, Timo Saarinen, Peter Dulski 2016 The Holocene 26 3 423-431 10.1177/0959683615609747

Clastic-organic varved sediments from the boreal Lake Kalliojärvi, Central Finland, record changes in snow accumulation for more than 4000 years. The varve record was reconstructed using digital image analysis from 4132 varve yr BP to present with 2.2% counting error and is supported by paleomagnetic data. Two laminae are identified in a typical varve structure: (1) the minerogenic lamina, which accumulates during spring as a result of catchment erosion triggered by spring floods and (2) the organic lamina, which is composed of allochthonous and autochthonous organic matter that accumulates during summer, autumn, and winter. The minerogenic influx is related to variations in snow accumulation and follows the different phases of the North Atlantic Oscillation (NAO). Decreased snow accumulation is related to a weakened NAO phase. Thus, the minerogenic influx record provides additional information about NAO variation. The Fe/Mn ratio is related to changes in redox conditions at the lake floor. The oxygen availability in the lake floor depends on the duration of the ice cover during winter. Strengthened Siberian High (SH) causes colder autumn and winter temperatures and therefore leads to extended duration of ice cover. Fe/Mn can be considered as a proxy for SH. The sediment record suggests pronounced, generally positive but strongly fluctuating NAO phase, from ca. 4100 to 3200 varve yr BP. Periods of strengthened SH are observed at 3900-3600, 1900-1500, and 1200-750 varve yr BP. Our study suggests that NAO and SH operate individually, are not clearly linked, and do not entirely block each other. STUDY NOTES: Varve thickness data from Lake Kalliojärvi, Eastern Finland for the past 4,000 years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/finland/kalliojarvi2016varve.txt Formatted Text Data File; Lake Kalliojärvi Varve Thickness Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11