noaa-recon-18515 Canadian Arctic and Greenland 15,000 Year July Temperature Reconstructions Gajewski, K.J. Canadian Arctic and Greenland 15,000 Year July Temperature Reconstructions 2015-03-20 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/18515 Investigator K.J. Gajewski earth science paleoclimate climate reconstructions|pollen surface temperature,null,null,degree Celsius,Jul,climate reconstructions|pollen,interpolated,modern analogue technique,N,regional averages interpolated to 200-year intervals earth science paleoclimate climate reconstructions|pollen surface temperature,null,null,degree Celsius,Jul,climate reconstructions|pollen,anomalized|interpolated,modern analogue technique,N,regional averages interpolated to 200-year intervals earth science paleoclimate climate reconstructions|pollen sample identification,null,null,null,null,climate reconstructions|pollen,null,null,N,Record number earth science paleoclimate climate reconstructions|pollen surface temperature,null,squared chord distance,dimensionless,Jul,climate reconstructions|pollen,null,modern analogue technique,N,First of top 3 analogue distances earth science paleoclimate climate reconstructions|pollen surface temperature,null,one standard deviation lower bound,degree Celsius,Jul,climate reconstructions|pollen,interpolated,modern analogue technique,N,null earth science paleoclimate climate reconstructions|pollen sample identification,null,null,null,null,climate reconstructions|pollen,null,null,C,Lake Name code and depth earth science paleoclimate climate reconstructions|pollen surface temperature,null,one standard deviation lower bound,degree Celsius,Jul,climate reconstructions|pollen,anomalized|interpolated,modern analogue technique,N,regional averages interpolated to 200-year intervals earth science paleoclimate climate reconstructions|pollen age,null,null,calendar year before present,null,climate reconstructions|pollen,null,null,N,present defined as 2000 AD earth science paleoclimate climate reconstructions|pollen surface temperature,null,squared chord distance,dimensionless,Jul,climate reconstructions|pollen,null,modern analogue technique,N,Second of top 3 analogue distances earth science paleoclimate climate reconstructions|pollen number of samples,null,null,count,null,climate reconstructions|pollen,null,null,N,Number of sites used for average earth science paleoclimate climate reconstructions|pollen surface temperature,null,one standard deviation upper bound,degree Celsius,Jul,climate reconstructions|pollen,anomalized|interpolated,modern analogue technique,N,regional averages interpolated to 200-year intervals earth science paleoclimate climate reconstructions|pollen sample identification,null,null,null,null,climate reconstructions|pollen,null,null,N,Region Code earth science paleoclimate climate reconstructions|pollen surface temperature,null,squared chord distance,dimensionless,Jul,climate reconstructions|pollen,null,modern analogue technique,N,average dissimilarity earth science paleoclimate climate reconstructions|pollen sample identification,null,null,null,null,climate reconstructions|pollen,null,null,N,Site number earth science paleoclimate climate reconstructions|pollen longitude,null,null,degree east,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate climate reconstructions|pollen surface temperature,null,null,degree Celsius,Jul,climate reconstructions|pollen,interpolated,modern analogue technique,N,null earth science paleoclimate climate reconstructions|pollen age,null,null,calendar year before present,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate climate reconstructions|pollen surface temperature,null,one standard deviation upper bound,degree Celsius,Jul,climate reconstructions|pollen,interpolated,modern analogue technique,N,null earth science paleoclimate climate reconstructions|pollen surface temperature,null,squared chord distance,dimensionless,Jul,climate reconstructions|pollen,null,modern analogue technique,N,Third of top 3 analogue distances earth science paleoclimate climate reconstructions|pollen latitude,null,null,degree north,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate reconstructions air temperature geoscientificInformation Air Temperature Reconstruction 15000 cal yr BP 0 cal yr BP Complete 60 83 -125 -20 Geographic Region Arctic Canadian Arctic and Greenland>LATITUDE >LONGITUDE 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 Gajewski, K. 2015 Global and Planetary Change 128 14-23 10.1016/j.gloplacha.2015.02.003 http://www.sciencedirect.com/science/article/pii/S0921818115000417

Holocene temperature variations were reconstructed for the Canadian Arctic Archipelago and coastal Greenland using pollen data from 39 radiocarbon-dated lake sediment cores. Using the modern analog technique, mean July temperatures were estimated for the past 10.2 ka, and regional averages computed. In the western and central Arctic, maximum temperatures were found before 7 ka. In the eastern Canadian Arctic, north Greenland and east Greenland, maximum temperatures were found between 8 and 5 ka, and in southern Greenland after 4 ka. When combined with previously published reconstructions from boreal Canada and eastern Beringia, the Holocene climate history of this region can be divided into three parts with major transitions at 8.0 and 5.2 ka, however, the different regions had different histories. STUDY NOTES: July temperatures based on pollen from lake sediments across the Canadian Arctic Archipelago and Greenland. The Modern Analogue Technique was used to estimate Tjul for 1400 pollen spectra from 39 lakes. Values were then interpolated to 200 year intervals and regional averages computed.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015northgreenland.txt Data File; Northern Greenland Temperature Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015eastcanada.txt Data File; Eastern Arctic Canada Temperature Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015.xlsx Excel Data File; Arctic, Regional, and Individual Site Temperature Reconstructions GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015eastgreenland.txt Data File; Eastern Greenland Temperature Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015arcticbysite.txt Data File; Temperature Reconstructions for Individual Pollen Sites GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015arctic-interp.txt Data File; Temperature Reconstructions for Individual Pollen Sites, 200 Year Interpolations GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015westcanada.txt Data File; Western Arctic Canada Temperature Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015arctic.txt Data File; Arctic Regional Temperature Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015southgreenland.txt Data File; Southern Greenland Temperature Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/northamerica/gajewski2015centralcanada.txt Data File; Central Arctic Canada Temperature Reconstruction USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11