globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.02.008
Scopus记录号: 2-s2.0-84959245820
论文题名:
Holocene ice-wedge polygon development in northern Yukon permafrost peatlands (Canada)
作者: Fritz M.; Wolter J.; Rudaya N.; Palagushkina O.; Nazarova L.; Obu J.; Rethemeyer J.; Lantuit H.; Wetterich S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 147
起始页码: 279
结束页码: 297
语种: 英语
英文关键词: Arctic ; Deuterium excess ; Diatoms ; Ice-wedge polygon ; Permafrost peatlands ; Plant macrofossils ; Pollen ; Stable water isotopes ; Talik ; Thermokarst
Scopus关键词: Biogeochemistry ; Carbon ; Climate change ; Geometry ; Grain size and shape ; Isotopes ; Lakes ; Mass spectrometry ; Organic carbon ; Particle accelerator accessories ; Permafrost ; Plants (botany) ; Revegetation ; Soil conservation ; Vegetation ; Wetlands ; Arctic ; Deuterium excess ; Diatoms ; Ice wedges ; Peat land ; Plant macrofossils ; Pollen ; Stable water isotopes ; Talik ; Thermokarst ; Ice ; arctic environment ; crack ; deuterium ; diatom ; fossil record ; grain size ; Holocene ; lacustrine environment ; paleoenvironment ; peatland ; permafrost ; pollen ; polygon ; radiocarbon dating ; stable isotope ; subarctic region ; thermokarst ; Canada ; Herschel Island ; Yukon Basin ; Yukon Territory ; Bacillariophyta ; Sus
英文摘要: Ice-wedge polygon (IWP) peatlands in the Arctic and Subarctic are extremely vulnerable to climatic and environmental change. We present the results of a multidisciplinary paleoenvironmental study on IWPs in the northern Yukon, Canada. High-resolution laboratory analyses were carried out on a permafrost core and the overlying seasonally thawed (active) layer, from an IWP located in a drained lake basin on Herschel Island. In relation to 14 Accelerator Mass Spectrometry (AMS) radiocarbon dates spanning the last 5000 years, we report sedimentary data including grain size distribution and biogeochemical parameters (organic carbon, nitrogen, C/N ratio, δ13C), stable water isotopes (δ18O, δD), as well as fossil pollen, plant macrofossil and diatom assemblages. Three sediment units (SUs) correspond to the main stages of deposition (1) in a thermokarst lake (SU1: 4950 to 3950 cal yrs BP), (2) during transition from lacustrine to palustrine conditions after lake drainage (SU2: 3950 to 3120 cal yrs BP), and (3) in palustrine conditions of the IWP field that developed after drainage (SU3: 3120 cal yrs BP to 2012 CE). The lacustrine phase (pre 3950 cal yrs BP) is characterized by planktonic-benthic and pioneer diatom species indicating circumneutral waters, and very few plant macrofossils. The pollen record has captured a regional signal of relatively stable vegetation composition and climate for the lacustrine stage of the record until 3950 cal yrs BP. Palustrine conditions with benthic and acidophilic diatom species characterize the peaty shallow-water environments of the low-centered IWP. The transition from lacustrine to palustrine conditions was accompanied by acidification and rapid revegetation of the lake bottom within about 100 years. Since the palustrine phase we consider the pollen record as a local vegetation proxy dominated by the plant communities growing in the IWP. Ice-wedge cracking in water-saturated sediments started immediately after lake drainage at about 3950 cal yrs BP and led to the formation of an IWP mire. Permafrost aggradation through downward closed-system freezing of the lake talik is indicated by the stable water isotope record. The originally submerged IWP center underwent gradual drying during the past 2000 years. This study highlights the sensitivity of permafrost landscapes to climate and environmental change throughout the Holocene. © 2016 Elsevier Ltd
资助项目: We thank the Yukon Territorial Government, the Yukon Parks (Herschel Island Qiqiktaruk Territorial Park), Parks Canada office (Ivvavik National Park) and the Aurora Research Institute – Aurora College (ARI) in Inuvik, NWT, for administrative and logistical support. This study was partly funded by the International Bureau of the German Federal Ministry of Education and Research (BMBF grant № CAN 09/001, 01DM12002 to H.L.) and the Helmholtz Association (grant № VH-NG-801 to H.L.). The study contributes to the Arctic Ecological Network (BMBF grant № 01DJ14003 to S.W.). L.N. and O.P. were sponsored by the Russian Government Program of Competitive Growth of Kazan Federal University and L.N. by the DFG (grant № NA 760/5-1). Analytical work received great help from Ute Kuschel, Tyne Brückner, Izabela Milczarek, and Christin Kramer at AWI and from Heiko Baschek at GeoForschungsZentrum Potsdam, Germany. George Tanski assisted in the field and Stefanie Burmeister assisted in technical preparation of the paper.
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被引频次[WOS]:37   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59508
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作者单位: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Department of Periglacial Research, Telegrafenberg A43, Potsdam, Germany; Utrecht University, Department of Earth Sciences, Heidelberglaan 2, Utrecht, Netherlands; University of Potsdam, Institute of Earth and Environmental Sciences, Karl-Liebknecht-Str. 24-25, Potsdam-Golm, Germany; Institute of Archaeology & Ethnography, Ac. Lavrentiev Ave. 17, SB RAS, Novosibirsk, Russian Federation; Novosibirsk State University, Pirogova Str. 2, Novosibirsk, Russian Federation; Altai State University, Lenin Ave. 46, Barnaul, Russian Federation; Kazan (Volga Region) Federal University, Kremlevskaya Str., 18, Kazan, Russian Federation; University of Cologne, Institute for Geology and Mineralogy, Zülpicher Str. 49a, Cologne, Germany

Recommended Citation:
Fritz M.,Wolter J.,Rudaya N.,et al. Holocene ice-wedge polygon development in northern Yukon permafrost peatlands (Canada)[J]. Quaternary Science Reviews,2016-01-01,147
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