noaa-lake-5465 Baffin Island 500 Year Summer Temperature Reconstruction Hughen, K.A.; Overpeck, J.T.; Anderson, R.F. Baffin Island 500 Year Summer Temperature Reconstruction 2003-10-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/5465 Investigator K.A. Hughen Investigator J.T. Overpeck Investigator R.F. Anderson earth science paleoclimate climate reconstructions|paleolimnology surface air temperature,varve thickness,null,degree Celsius,Jun,climate reconstructions|paleolimnology,null,null,N,based on varve thickness earth science paleoclimate climate reconstructions|paleolimnology age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology varve thickness,null,null,millimeter,null,paleolimnology,null,null,N,dark laminae earth science paleoclimate paleolimnology reconstruction earth science paleoclimate paleolimnology physical properties geoscientificInformation Air Temperature Reconstruction 436 cal yr BP -42 cal yr BP Complete 62.9167 62.9167 -69.8833 -69.8833 Continent North America Canada Northwest Territories Upper Soper Lake>LATITUDE 62.9167>LONGITUDE -69.8833 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 Hughen, K.A., J.T. Overpeck, R.F. Anderson. 2000. Recent Warming in a 500-Year Paleotemperature Record from Varved Sediments: Upper Soper Lake, Baffin Island, Canada. The Holocene Vol. 10, no. 1, pp. 9-19

Laminated sediments from Upper Soper Lake on southern Baffin Island provide a new 500-year record of temperature change in the Arctic. Radiometric dating, using 210 Pb and Pu, shows that the light- and dark-coloured laminae couplets are annually deposited varves. Dark laminae thickness is strongly correlated to average June temperature from Kimmirut (r = 0.82), reflecting the influence of temperature on snowmelt and fluxes of runoff and suspended sediment. This relationship allowed the construction of a palaeotemperature record that documents large-amplitude interannual to decadal variability superimposed on distinct century-scale trends, including 2°C average warming and maximum temperatures during the 1900s. Similar patterns of change are seen in individual and regionally averaged palaeotemperature records from around the circum-Arctic. Upper Soper Lake records temperatures, rates of change and variance during the twentieth century that are all anomalously high within the context of the last 500 years, and outside the observed range of natural variability. Comparisons of Upper Soper Lake and Arctic average palaeotemperature to proxy-records of hypothesized forcing mechanisms suggest that the recent warming trend is mostly due to anthropogenic emissions of atmospheric greenhouse gases. The magnitude of the warming and decade-scale variability throughout the records, however, indicate that natural forcing mechanisms such as changing solar irradiance and volcanic activity, as well as positive feedbacks within the Arctic environment, also play an important role. STUDY NOTES: Summer temperature reconstruction based on laminae thickness in sediments from Upper Soper Lake, Baffin Island, Canada.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/soper_2000.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11