noaa-lake-26170 Scoop Lake, South Greenland 3000 Year Chironomid d18O and Temperature Lasher, G.E.; Axford, Y. Scoop Lake, South Greenland 3000 Year Chironomid d18O and Temperature 2019-02-11 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/26170 Investigator G.E. Lasher Investigator Y. Axford earth science paleoclimate paleolimnology oxygen isotopes geoscientificInformation 2782 cal yr BP -66 cal yr BP Complete 60.697 60.697 -45.419 -45.419 477 477 Continent North America Greenland Scoop Lake>LATITUDE 60.697>LONGITUDE -45.419 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 Lasher, G. Everett; Axford, Yarrow 2019 Geology 10.1130/G45833.1 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/568708/medieval-warmth-confirmed-at-the-norse-eastern

Recent work has documented glacier advances in West Greenland coincident with the Medieval Climate Anomaly (MCA) and warmth across much of northern Europe. The North Atlantic Oscillation (NAO) has been invoked to explain antiphasing of temperatures between these North Atlantic regions. Historical and model observations suggest negative correlation between the mode of NAO and both temperature and d18O values of precipitation over much of Greenland. We test for a hypothesized positive NAO mode and associated cool conditions during the MCA in South Greenland within the Norse Eastern Settlement by reconstructing d18O values of precipitation at subcentennial resolution over the past 3000 yr using aquatic insect subfossils preserved in lake sediments. More positive d18O values are found between 900 and 1400 CE, indicating a period of warmth in South Greenland superimposed on late Holocene insolation-forced Neoglacial cooling, and thus not supporting a positive NAO anomaly during the MCA. Highly variable d18O values record an unstable climate at the end of the MCA, preceding Norse abandonment of Greenland. The spatial pattern of paleoclimate in this region supports proposals that North Atlantic subpolar ocean currents modulated South Greenland's climate over the past 3000 yr, particularly during the MCA. Terrestrial climate in the Labrador Sea and Baffin Bay regions may be spatially heterogeneous on centennial time scales due in part to the influence of the subpolar gyre. STUDY NOTES: Oxygen isotope record measured on chironomid head capsule macrofossils. Paleo lake water is inferred from chironomid d18O values

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/scoop2019.txt NOAA Template File; Scoop Lake Chironomid d18O and Temperature USA/NOAA DIF Version 9.8.4 2019-02-15 2019-02-15