noaa-lake-22193 Lake Kallio-Kourujärvi, Central Finland 3,000 Year Varve Thickness Data Saarni, S.; Saarinen, T.; Lensu, A. Lake Kallio-Kourujärvi, Central Finland 3,000 Year Varve Thickness Data 2017-06-05 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22193 Investigator S. Saarni Investigator T. Saarinen Investigator A. Lensu earth science paleoclimate paleolimnology depth,null,null,millimeter,null,paleolimnology,null,null,N,null 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,raw,microscopy,N,null earth science paleoclimate paleolimnology physical properties geoscientificInformation -1000 AD 1950 AD 2950 cal yr BP 0 cal yr BP Complete 62.561 62.561 27.003 27.003 117 117 Continent Europe Northern Europe Scandanavia Finland Lake Kallio-Kourujärvi>LATITUDE 62.561>LONGITUDE 27.003 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, Anssi Lensu 2015 Journal of Paleolimnology 53 4 401-413 10.1007/s10933-015-9832-8 https://link.springer.com/article/10.1007/s10933-015-9832-8

Annually laminated (varved) sediments from Lake Kallio-Kourujärvi, Central Finland, provide high-resolution sedimentological data for the last three millennia. These varves consist of two laminae that represent (1) deposition during the spring-to-autumn growing season, composed of degraded organic matter and a variety of microfossils, and (2) deposition during winter, composed of fine-grained homogenous organic matter. Because of the absence of a clastic lamina, these varves differ from the typical, well-described, clastic-organic varve sequences in Fennoscandian lakes. Such organic varves in Finnish lakes have not been studied in detail before. Three thousand varves were counted and their seasonal deposition was distinguished. Comparison of varve thickness with meteorological data revealed a positive correlation between organic varve thickness and precipitation. This suggests that catchment erosion processes and consequent organic matter and nutrient inputs are important factors in organic varve formation. The correlation between temperature and growing-season lamina thickness varied from insignificant, to positive, to negative during different time spans. This suggests that organic matter accumulation can sometimes have a significant, but unpredictable role in organic varve formation, via organic matter production and degradation, processes that are influenced strongly by water column temperature. The organic varves of Lake Kallio-Kourujärvi enable a unique, high-resolution approach for the study of past climate and environment. Our results suggest that decadal periods of increased precipitation occurred during BP 2150-2090, 1710-1620, 1410-1360, 920-870 (1030-1080 AD), and after 370 BP (1580 AD). Dryer intervals occurred during BP 2750-2720, 1900-1850, 1800-1740, 1600-1500, and 780-700 (1170-1250 AD), 590-520 (1360-1430 AD). STUDY NOTES: Varve thickness data from Lake Kallioi-Kourujärvi, Central Finland for the past 3,000 years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/finland/kallio-kourujarvi2015varve.txt Formatted Text Data Files; Lake Kallio-Kourujärvi Varve Thickness Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11