Sedimentological, biogeomcial and geochronological data of thermokarst lake sediment core PG1967 ...

• Main Authors: Lenz, Josefine, Fritz, Michael, Schirrmeister, Lutz, Lantuit, Hugues, Wooller, Matthew J, Pollard, Wayne H, Wetterich, Sebastian
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2013
• Subjects: Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; Herschel; Herschel Island; Ice; Magnetic susceptibility; permafrost; Thermokarst; Yukon
• Online Access: https://dx.doi.org/10.1594/pangaea.855420; https://doi.pangaea.de/10.1594/PANGAEA.855420

Ice-rich permafrost landscapes are sensitive to climate and environmental change due to the melt-out of ground ice during thermokarst development. Thermokarst processes in the northern Yukon Territory are currently not well-documented. Lake sediments from Herschel Island (69°36'N; 139°04'W) in the western Canadian Arctic provide a record of thermokarst lake development since the early Holocene. A 727 cm long lake sediment core was analyzed for radiographic images, magnetic susceptibility, granulometry, and biogeochemical parameters (organic carbon, nitrogen, and stable carbon isotopes). Based on eight calibrated AMS radiocarbon dates, the sediment record covers the last ~ 11,500 years and was divided into four lithostratigraphic units (A to D) reflecting different thermokarst stages. Thermokarst initiation at the study area began ~ 11.5 cal ka BP. From ~ 11.5 to 10.0 cal ka BP, lake sediments of unit A started to accumulate in an initial lake basin created by melt-out of massive ground ice and thaw ... : Supplement to: Lenz, Josefine; Fritz, Michael; Schirrmeister, Lutz; Lantuit, Hugues; Wooller, Matthew J; Pollard, Wayne H; Wetterich, Sebastian (2013): Periglacial landscape dynamics in the western Canadian Arctic: Results from a thermokarst lake record on a push moraine (Herschel Island, Yukon Territory). Palaeogeography, Palaeoclimatology, Palaeoecology, 381-382, 15-25 ...