Bulk sediment parameter of three sediment cores from permafrost lowlands, Alaska Arctic Coastal Plain ...

• Main Authors: Lenz, Josefine, Jones, Benjamin M, Wetterich, Sebastian, Tjallingii, Rik, Fritz, Michael, Arp, Chistopher D, Rudaya, Natalia, Grosse, Guido
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; Ice; permafrost; Thermokarst; Alaska
• Online Access: https://dx.doi.org/10.1594/pangaea.864814; https://doi.pangaea.de/10.1594/PANGAEA.864814

Arctic lowland landscapes have been modified by thermokarst lake processes throughout the Holocene. Thermokarst lakes form as a result of ice-rich permafrost degradation and they may expand over time through thermal and mechanical shoreline erosion. We studied proximal and distal sedimentary records from a thermokarst lake located on the Arctic Coastal Plain of northern Alaska to reconstruct the impact of catchment dynamics and morphology on the lacustrine depositional environment and to quantify carbon accumulation in thermokarst lake sediments. Short cores were collected for analysis of pollen, sedimentological and geochemical proxies. Radiocarbon and Pb/Cs dating, as well as extrapolation of measured historic lake expansion rates, were applied to estimate a minimum lake age of ~ 1,400 calendar years BP. The pollen record is in agreement with the young lake age as it does not include evidence of the "alder high" that occurred in the region ~ 4.0 cal ka BP. The lake most likely initiated from a remnant pond ... : Supplement to: Lenz, Josefine; Jones, Benjamin M; Wetterich, Sebastian; Tjallingii, Rik; Fritz, Michael; Arp, Chistopher D; Rudaya, Natalia; Grosse, Guido (2016): Impacts of shore expansion and catchment characteristics on lacustrine thermokarst records in permafrost lowlands, Alaska Arctic Coastal Plain. arktos - The Journal of Arctic Geosciences ...