noaa-lake-11176 Kangerlussuaq, West Greenland 6000 Year Lake Alkenone Data D'Andrea, W.J.; Huang, Y.; Fritz, S.C.; Anderson, N.J. Kangerlussuaq, West Greenland 6000 Year Lake Alkenone Data 2011-05-31 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/11176 Investigator W.J. D'Andrea Investigator Y. Huang Investigator S.C. Fritz Investigator N.J. Anderson earth science paleoclimate paleolimnology alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology geochemistry geoscientificInformation abrupt climate change 6119 cal yr BP -55 cal yr BP Complete 67 67 -50.7 -50.7 170 170 Continent North America Greenland Lake E>LATITUDE 67>LONGITUDE -50.7 Continent North America Greenland Braya So Lake>LATITUDE 67>LONGITUDE -50.7 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 William J. D’Andrea, Yongsong Huang, Sherilyn C. Fritz and N. John Anderson 2011 Proceedings of the National Academy of Sciences 108 24 9765-9769 10.1073/pnas.1101708108 http://www.pnas.org/content/108/24/9765

West Greenland has had multiple episodes of human colonization and cultural transitions over the past 4,500 y. However, the explanations for these large-scale human migrations are varied, including climatic factors, resistance to adaptation, economic marginalization, mercantile exploration, and hostile neighborhood interactions. Evaluating the potential role of climate change is complicated by the lack of quantitative paleoclimate reconstructions near settlement areas and by the relative stability of Holocene temperature derived from ice cores atop the Greenland ice sheet. Here we present high-resolution records of temperature over the past 5,600 y based on alkenone unsaturation in sediments of two lakes in West Greenland. We find that major temperature changes in the past 4,500 y occurred abruptly (within decades), and were coeval in timing with the archaeological records of settlement and abandonment of the Saqqaq, Dorset, and Norse cultures, which suggests that abrupt temperature changes profoundly impacted human civilization in the region. Temperature variations in West Greenland display an antiphased relationship to temperature changes in Ireland over centennial to millennial timescales, resembling the interannual to multidecadal temperature seesaw associated with the North Atlantic Oscillation. STUDY NOTES: Alkenone unsaturation measurements from Holocene sediment cores of two lakes in Kangerlussuaq, West Greenland (Braya So and Lake E) and a stacked record derived by averaging the overlapping sections of the two records (Kanger Stack). The age model was developed by aligning the independently radiocarbon dated UK37 records from Braya So and Lake E within the 2 sigma error of their respective chronological uncertainties prior to 20-yr resampling utilized in the Kanger Stack.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/kangerlussuaq2011.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/kangerlussuaq2011.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11