DOI: 10.1016/j.quascirev.2015.08.031
Scopus记录号: 2-s2.0-84942037927
论文题名: A multi-proxy reconstruction of environmental change spanning the last 37,000 years from Burial Lake, Arctic Alaska
作者: Finkenbinder M.S. ; Abbott M.B. ; Finney B.P. ; Stoner J.S. ; Dorfman J.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 126 起始页码: 227
结束页码: 241
语种: 英语
英文关键词: Alaska
; Biogenic silica
; Carbon and nitrogen isotopes
; Climate change
; Eastern Beringia
; Holocene
; Last Glacial Maximum
; Late-Quaternary
; Magnetic susceptibility
; Scanning X-ray fluorescence
Scopus关键词: Biogeochemistry
; Biological materials
; Carbon
; Climate change
; Fluorescence
; Geochemistry
; Glacial geology
; Isotopes
; Lakes
; Magnetic susceptibility
; Magnetism
; Organic compounds
; Productivity
; Silica
; Alaska
; Biogenic silica
; Carbon and nitrogen isotopes
; Eastern Beringia
; Holocenes
; Last Glacial Maximum
; Late quaternary
; X ray fluorescence
; Sediments
; biogenic deposit
; carbon isotope
; climate variation
; Holocene
; intermediate water
; last deglaciation
; Last Glacial Maximum
; lithology
; magnetic susceptibility
; nitrogen isotope
; sediment core
; water depth
; Younger Dryas
; Bering Island
; Kamchatka
; Komandorski Islands
; Russian Federation
英文摘要: Sediment cores from Burial Lake located in the western Brooks Range in Arctic Alaska record paleoenvironmental changes that span the last 37,000 calendar years before present (cal yr BP). We identified four distinct lithologic subunits based on physical properties (dry bulk density, magnetic susceptibility), sediment composition, and geochemical proxies (organic matter, biogenic silica, C/N, organic matter δ13C and δ15N, and elemental data from scanning X-ray fluorescence). The multi-proxy approach and relatively high temporal resolution (at multi-decadal to centennial time scales) of our proxy analysis, compared with previous studies of intermediate water depth cores from Burial Lake, provide new insights into the paleoenvironmental history of the region spanning the period prior to the Last Glacial Maximum. Relatively high lake-levels and gradually decreasing in-lake and terrestrial productivity occur during the mid-Wisconsin interstadial from 37,200 to 29,600 cal yr BP. The subsequent period is defined by falling and lower lake-levels with decreasing effective-moisture, windier conditions, and sustained low aquatic productivity throughout the LGM between 29,600 and 19,600 cal yr BP. The last deglaciation that commenced by 19,600 cal yr BP is characterized by gradual changes in several sediment physical and geochemical proxies, including increasing C/N ratios and terrestrial productivity, decreasing magnetic susceptibility and clastic sediment flux, along with rising and relatively higher lake-levels. A decrease in aeolian activity after 16,500 cal yr BP is inferred from the appearance of fine (very fine sandy silt) sediment, compared to coarse sediments through the LGM and last deglaciation. The highest levels of terrestrial inputs along with increasing and variable aquatic productivity occur during the Lateglacial to early Holocene interval between 16,500 and 8800 cal yr BP. The absence of multi-proxy evidence for a strong climatic reversal during the Younger Dryas from Burial Lake sediments contrasts with some paleorecords showing cooler temperatures and/or dry conditions in northern Alaska at this time. Peak levels of sediment organic content and terrestrial productivity at Burial Lake between 10,500 and 9900 cal yr BP coincide with the early Holocene summer insolation maxima, which likely represents summertime warming and an enhanced flux of watershed derived organic matter from permafrost degradation. The remainder of the Holocene (since 8800 cal yr BP) at Burial Lake is characterized by relatively high and stable lake levels, landscape stabilization, and relatively high and variable levels of aquatic productivity. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60079
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology and Planetary Science, University of Pittsburgh, Pittsburgh, PA, United States; Department of Biological Sciences, Idaho State University, Pocatello, ID, United States; Department of Geosciences, Idaho State University, Pocatello, ID, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
Recommended Citation:
Finkenbinder M.S.,Abbott M.B.,Finney B.P.,et al. A multi-proxy reconstruction of environmental change spanning the last 37,000 years from Burial Lake, Arctic Alaska[J]. Quaternary Science Reviews,2015-01-01,126