noaa-lake-6203 Big Round Lake, Baffin Island 1,000 Year Varve Thickness Data Thomas, E.K.; Briner, J.P. Big Round Lake, Baffin Island 1,000 Year Varve Thickness Data 2008-11-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/6203 Investigator E.K. Thomas Investigator J.P. Briner earth science paleoclimate paleolimnology sample identification,null,null,null,null,paleolimnology,null,null,N,null earth science paleoclimate climate reconstructions|paleolimnology surface air temperature,varve thickness,null,degree Celsius,Jul-Sep,climate reconstructions|paleolimnology,null,null,N,varve inferred earth science paleoclimate paleolimnology varve thickness,sediment,null,millimeter,null,paleolimnology,null,null,N,sand thickness earth science paleoclimate paleolimnology volume magnetic susceptibility,sediment,null,dimensionless (CGS system),null,paleolimnology,null,null,N,null earth science paleoclimate climate reconstructions|paleolimnology surface air temperature,varve thickness,two standard deviations,degree Celsius,Jul-Sep,climate reconstructions|paleolimnology,null,null,N,varve inferred earth science paleoclimate climate reconstructions|paleolimnology age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology biogenic silica,sediment,null,percent,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology varve thickness,sediment,null,millimeter,null,paleolimnology,null,null,N,total thickness earth science paleoclimate paleolimnology water content,sediment,null,percent,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology varve thickness,null,null,millimeter,null,paleolimnology,null,null,N,total minus sand thickness earth science paleoclimate paleolimnology organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,null earth science paleoclimate paleolimnology physical properties geoscientificInformation Air Temperature Reconstruction PAGES 2k Network PAGES Arctic 2k 979 cal yr BP -53 cal yr BP Complete 69.866 69.866 -68.833 -68.833 180 180 Continent North America Canada Nunavut Big Round Lake>LATITUDE 69.866>LONGITUDE -68.833 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 Thomas, E.K. and J.P. Briner 2009 Journal of Paleolimnology 41 1 209-224 10.1007/s10933-008-9258-7

This study uses 239+240Pu-dated varved sediments from Big Round Lake, a proglacial lake on northeast Baffin Island, Arctic Canada to generate a 1000-year-long, annual-resolution record of past climate. Varve thickness is positively correlated with July-August-September temperature measured at Clyde River, 70 km to the north of the lake (r = 0.46, p<0.001). We therefore interpret the variability and trends in varve thickness to partially represent summer temperature. The coolest Little Ice Age temperatures occurred in this record from 1575 to 1760 AD and were approximately 1.5C cooler than today (average from 1995 to 2005 AD) and 0.2C cooler than the last millennium (average from 1000 to 2000 AD). Pre-twentieth-century warmth occurred during two intervals, 970-1150 AD and 1375-1575 AD; temperatures were approximately 1.2C cooler than today, but 0.1C warmer than the last millennium. The Big Round Lake varve-thickness record contains features similar to that reconstructed elsewhere in the eastern Canadian Arctic. This high-resolution quantitative record expands our understanding of arctic climate during the past millennium. STUDY NOTES: Varve thickness and varve-inferred July-August September temperature from Big Round Lake, Baffin Island, Nunavut, Canada

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/big-round2008.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/big-round2008.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11