Big Round Lake, Baffin Island 1,000 Year Varve Thickness Data Thomas, E.K.; Briner, J.P. Thomas, E.K. Briner, J.P. Air Temperature Reconstruction PAGES 2k Network PAGES Arctic 2k 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 (Big Round Lake>LATITUDE 69.866>LONGITUDE -68.833) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Thomas, E.K. Investigator : Briner, J.P. 2008-11-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6203 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/big-round2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/big-round2008.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/big-round2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/big-round2008.txt English https://www.ncdc.noaa.gov/paleo/study/6203 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/big-round2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/big-round2008.txt Thomas, E.K. and J.P. Briner2009Climate of the past millennium inferred from varved proglacial lake sediments on northeast Baffin Island, Arctic CanadaJournal of Paleolimnology411209-22410.1007/s10933-008-9258-7 START YEAR: 979 cal yr BP * END YEAR: -53 cal yr BP -68.833 69.866 -68.833 69.866