Multiple thermo-erosional episodes during the past six millennia: Implications for the response of Arctic permafrost to climate change

noaa-lake-20289 North Slope, Alaska 6,000 Year Lake Sediment Geochemical Data Chipman, M.L.; Kling, G.W.; Lundstrom, C.C.; Hu, F.S. North Slope, Alaska 6,000 Year Lake Sediment Geochemical Data 2016-06-16 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20289 Investigator M.L. Chipman Investigator G.W. Kling Investigator C.C. Lundstrom Investigator F.S. Hu earth science paleoclimate paleolimnology carbon isotopes earth science paleoclimate paleolimnology geochemistry geoscientificInformation 6135 cal yr BP -58 cal yr BP Complete 68.6744 68.9414 -150.4994 -149.6264 400 700 Continent North America United States Of America Alaska Perch Lake Alaska>LATITUDE 68.9414>LONGITUDE -150.4994 Continent North America United States Of America Alaska Lake NE14>LATITUDE 68.6744>LONGITUDE -149.6264 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 Melissa L. Chipman, George W. Kling, Craig C. Lundstrom, Feng Sheng Hu 2016 Multiple thermo-erosional episodes during the past six millennia: Implications for the response of Arctic permafrost to climate change Geology 44 6 439-442 10.1130/G37693.1 http://geology.gsapubs.org/content/44/6/439.abstract

Anthropogenic warming may promote rapid permafrost thaw in the Arctic and alter the global carbon cycle. Although several studies suggest increased thermo-erosion as a result of recent warming, a long-term context is necessary to assess the linkages of thermokarst processes with climate variability. We analyzed sediment cores from two lakes on the Alaskan North Slope (USA), one with (Lake NE14) and one without (Perch Lake) watershed thermo-erosion. Distinct geochemical and lithological characteristics provide evidence for sedimentary input from carbonate-rich permafrost soils associated with past retrogressive thaw slumping at Lake NE14 but not at Perch Lake. These characteristics include increases in Ca:Sr, Ca:K, carbonate:[feldspar + clay minerals], percent CaCO3, and d13C, and decreases in 87Sr:86Sr. At least ten episodes of thermo-erosion occurred over the past 6000 yr at Lake NE14. Most of these episodes coincided with periods of elevated summer temperatures, but moisture variation and geomorphic factors likely played a role in driving their occurrence. Our results suggest that positive feedbacks facilitate reactivation of thermo-erosion in ice-rich terrain, adding to the growing body of evidence that these Arctic landscapes are unstable in a changing climate. STUDY NOTES: Geochemical data from 2 lakes on the North Slope of Alaska, USA for the past 6,000 years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/ne14-2016sr.txt Data File; Lake NE14 87Sr/86Sr Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/perch2016loi.txt Data File; Perch Lake LOI Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/ne14-2016loi.txt Data File; Lake NE14 LOI Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/ne14-2016d13c.txt Data File; Lake NE14 d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/ne14-2016xrd.txt Data File; Lake NE14 XRD Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/perch2016xrf.txt Data File; Perch Lake XRF Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/ne14-2016xrf.txt Data File; Lake NE14 XRF Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11