Nunavut, Canada Pollen and Lake Sediment 2,500 Year Geochemical Data Peros, M.C.; Gajewski, K.J. Peros, M.C. Gajewski, K.J. Air Temperature Reconstruction PAGES 2k Network PAGES Arctic 2k Precipitation Reconstruction earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,milligram per square centimeter per year,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,milligram per square centimeter per year,null,paleolimnology,null,loss on ignition,N,null) earth science/paleoclimate/paleolimnology (Lake MB01>LATITUDE 69.806>LONGITUDE -112.075) (Lake SL06>LATITUDE 68.5893>LONGITUDE -91.8922) Two lake-sediment cores from the western and central Canadian Arctic were used to investigate late Holocene climate variability in the region. Both cores were analyzed for pollen, organic matter, biogenic silica, and magnetic susceptibility, and were dated using a combination of 210Pb and 14C techniques. Core MB01, from southwestern Victoria Island, provides a 2600-year-long record. Fossil pollen percentages, along with other parameters, suggest the occurrence of a cold period around 2400 cal year BP (450 BC), followed by slightly warmer conditions by 1800 cal year BP (150 AD), and a return to cooler conditions throughout much of the last millennium. Core SL06, from southern Boothia Peninsula, shows more subtle changes in pollen percentages over its 2500-year duration, but an increase in Cyperaceae and decrease in Oxyria pollen around 1400 cal year BP (550 AD) are indicative of warmer conditions at that time. Quantitative climate reconstructions from these pollen sequences were compared to two other pollen-based climate records from the region and indicate the presence of a widespread wet period ~1500 cal year BP (450 AD), and a cool and dry Little Ice Age. In the reconstructions based on pollen percentage data, the twentieth century summer temperature and annual precipitation in the central and western Canadian Arctic were comparable to that which occurred over the last 2500 years. However, pollen-influx values increase in the most recent sediments, suggesting high plant productivity during the late twentieth century. STUDY NOTES: Geochemical data (BSi, LOI, MS) and pollen data from 2 lakes in Nunavut, northern Canada. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Peros, M.C. Investigator : Gajewski, K.J. 2008-11-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6200 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.xls English https://www.ncdc.noaa.gov/paleo/study/6200 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/nunavut2008.xls Peros, M.C. and K. Gajewski2009Pollen-based reconstructions of late Holocene climate from the central and western Canadian ArcticJournal of Paleolimnology411161-17510.1007/s10933-008-9256-9 START YEAR: 2652 cal yr BP * END YEAR: -56 cal yr BP -112.075 68.5893 -91.8922 69.806