Single non-normalized data of electron probe analyses of all glass shard samples from the Seward Peninsula and the Lipari obsidian reference standard ...

• Main Authors: Lenz, Josefine, Wetterich, Sebastian, Jones, Benjamin M, Meyer, Hanno, Bobrov, Anatoly A, Grosse, Guido
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; Rapid Permafrost Thaw in a Warming Arctic and Impacts on the Soil Organic Carbon Pool PETA-CARB; Ice; Magnetic susceptibility; permafrost; Seward Peninsula; Thermokarst; Alaska; Beringia
• Online Access: https://dx.doi.org/10.1594/pangaea.859554; https://doi.pangaea.de/10.1594/PANGAEA.859554

Permafrost degradation influences the morphology, biogeochemical cycling and hydrology of Arctic landscapes over a range of time scales. To reconstruct temporal patterns of early to late Holocene permafrost and thermokarst dynamics, site-specific palaeo-records are needed. Here we present a multi-proxy study of a 350-cm-long permafrost core from a drained lake basin on the northern Seward Peninsula, Alaska, revealing Lateglacial to Holocene thermokarst lake dynamics in a central location of Beringia. Use of radiocarbon dating, micropalaeontology (ostracods and testaceans), sedimentology (grain-size analyses, magnetic susceptibility, tephra analyses), geochemistry (total nitrogen and carbon, total organic carbon, d13Corg) and stable water isotopes (d18O, dD, d excess) of ground ice allowed the reconstruction of several distinct thermokarst lake phases. These include a pre-lacustrine environment at the base of the core characterized by the Devil Mountain Maar tephra (22 800±280 cal. a BP, Unit A), which has ... : Supplement to: Lenz, Josefine; Wetterich, Sebastian; Jones, Benjamin M; Meyer, Hanno; Bobrov, Anatoly A; Grosse, Guido (2016): Evidence of multiple thermokarst lake generations from an 11 800-year-old permafrost core on the northern Seward Peninsula, Alaska. Boreas, 20 pp ...