noaa-lake-6200 Nunavut, Canada Pollen and Lake Sediment 2,500 Year Geochemical Data Peros, M.C.; Gajewski, K.J. Nunavut, Canada Pollen and Lake Sediment 2,500 Year Geochemical Data 2008-11-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/6200 Investigator M.C. Peros Investigator K.J. Gajewski 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 geochemistry geoscientificInformation Air Temperature Reconstruction PAGES 2k Network PAGES Arctic 2k Precipitation Reconstruction 2652 cal yr BP -56 cal yr BP Complete 68.5893 69.806 -112.075 -91.8922 243 290 Continent North America Canada Nunavut Lake MB01>LATITUDE 69.806>LONGITUDE -112.075 Continent North America Canada Nunavut Lake SL06>LATITUDE 68.5893>LONGITUDE -91.8922 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 Peros, M.C. and K. Gajewski 2009 Journal of Paleolimnology 41 1 161-175 10.1007/s10933-008-9256-9

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.

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