globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.04.009
论文题名:
Periglacial landscape dynamics in the western canadian arctic: Results from a thermokarst lake record on a push moraine (Herschel Island, Yukon Territory)
作者: Lenz J.; Fritz M.; Schirrmeister L.; Lantuit H.; Wooller M.J.; Pollard W.H.; Wetterich S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 381-382
起始页码: 15
结束页码: 25
语种: 英语
英文关键词: Canadian Arctic ; Herschel Island ; Holocene thermal maximum ; Paleolimnology ; Permafrost ; Thermokarst
英文摘要: 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 subsidence. Between 10.0 and 7.0. cal ka BP (unit B) the lake basin expanded in size and depth, attributed to talik formation during the Holocene thermal maximum. Higher-than-modern summer air temperatures led to increased lake productivity and widespread terrain disturbances in the lake's catchment. Thermokarst lake development between 7.0 and 1.8. cal ka BP (unit C) was characterized by a dynamic equilibrium, where lake basin and talik steadily expanded into ambient ice-rich terrain through shoreline erosion. Once lakes become deeper than the maximum winter lake ice thickness, thermokarst lake sediments show a great preservation potential. However, site-specific geomorphic factors such as episodic bank-shore erosion or sudden drainage through thermo-erosional valleys or coastal erosion breaching lake basins can disrupt continuous deposition. A hiatus in the record from 1.8 to 0.9. cal ka BP in Lake Herschel likely resulted from lake drainage or allochthonous slumping due to collapsing shore lines before continuous sedimentation of unit D recommenced during the last 900. years. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69729
Appears in Collections:过去全球变化的重建

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作者单位: Alfred Wegener Institute for Polar and Marine Research, Department of Periglacial Research, Telegrafenberg A43, 14473 Potsdam, Germany; University of Alaska Fairbanks, Water and Environmental Research Center, School of Fisheries and Ocean Sciences, Fairbanks, AK 99775, United States; University of Alaska Fairbanks, Alaska Quaternary Center, Fairbanks, AK 99775, United States; McGill University, Department of Geography, 805 Sherbrooke St. West, H3A2K6 Montreal, QC, Canada

Recommended Citation:
Lenz J.,Fritz M.,Schirrmeister L.,et al. Periglacial landscape dynamics in the western canadian arctic: Results from a thermokarst lake record on a push moraine (Herschel Island, Yukon Territory)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,381-382
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