noaa-lake-10750 Seven Mile Lake, Yukon 1000 Year Oxygen Isotope Data Anderson, L.; Finney, B.P.; Shapley, M.D. Seven Mile Lake, Yukon 1000 Year Oxygen Isotope Data 2011-04-06 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/10750 Investigator L. Anderson Investigator B.P. Finney Investigator M.D. Shapley earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology delta 18O,carbonate,null,per mil VPDB,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology oxygen isotopes geoscientificInformation Little Ice Age (LIA) hydrology 962 cal yr BP -49 cal yr BP Complete 62.17916 62.17916 -136.38323 -136.38323 520 520 Continent North America Canada Yukon Territory Seven Mile Lake>LATITUDE 62.17916>LONGITUDE -136.38323 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 Anderson, L., B.P. Finney, and M.D. Shapley. 2011. Lake carbonate d18O records from the Yukon Territory, Canada: Little Ice Age moisture variability and patterns. Quaternary Science Reviews, Vol. 30, Issues 7-8, April 2011, pp. 887-898. doi:10.1016/j.quascirev.2011.01.005

A 1000-yr history of climate change in the central Yukon Territory, Canada, is inferred from sediment composition and isotope geochemistry from small, groundwater fed, Seven Mile Lake. Recent observations of lake-water d18O, lake level, river discharge, and climate variations, suggest that changes in regional effective moisture (precipitation minus evaporation) are reflected by the lake's hydrologic balance. The observations indicate that the lake is currently 18O-enriched by summer evaporation and that during years of increased precipitation, when groundwater inflow rates to the lake increase, lakewater d18O values decrease. Past lake-water d18O values are inferred from oxygen isotope ratios of fine-grained sedimentary endogenic carbonate. Variations in carbonate d18O, supplemented by those in carbonate and organic d13C, C/N ratios, and organic carbon, carbonate and biogenic silica accumulation rates, document changes in effective moisture at decadal time scales during the early Little Ice Age period to present. Results indicate that between ~AD 1000 and 1600, effective moisture was higher than today. A shift to more arid climate conditions occurred after ~AD 1650. The 19th and 20th centuries have been the driest of the past millennium. Temporal variations correspond with inferred shifts in summer evaporation from Marcella Lake d18O, a similarly small, stratified, alkaline lake located ~250 km to the southwest, suggesting that the combined reconstructions accurately document the regional paleoclimate of the east-central interior. Comparison with regional glacial activity suggests differing regional moisture patterns during early and late Little Ice Age advances. STUDY NOTES: High resolution sediment d18O data from Seven Mile Lake, Yukon covering the last 1000 years. Carbonate d18O ratios of 32um bulk sediment size fraction from continuous intervals of 0.5 cm from 0 to 55.5 cm depth. Intervals of low percent carbonate (and corresponding isotope data gaps) are interpreted as dry periods.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/yukon/seven-mile2011.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/yukon/seven-mile2011.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11