DOI: 10.1016/j.quascirev.2018.01.002
Scopus记录号: 2-s2.0-85041350954
论文题名: Aeolian stratigraphy describes ice-age paleoenvironments in unglaciated Arctic Alaska
作者: Gaglioti B.V. ; Mann D.H. ; Groves P. ; Kunz M.L. ; Farquharson L.M. ; Reanier R.E. ; Jones B.M. ; Wooller M.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 182 起始页码: 175
结束页码: 190
语种: 英语
英文关键词: Alaska
; Arctic
; Ice age
; Loess
; Mammoth steppe
; North slope
; Paleoenvironments
; Permafrost
; Pleistocene
; Sand sea
; Sand sheet
; Stratigraphy
; Yedoma
Scopus关键词: Climate change
; Deposition
; Forestry
; Glacial geology
; Permafrost
; Sand
; Sediments
; Soils
; Stratigraphy
; Vegetation
; Alaska
; Arctic
; Ice age
; Loess
; Mammoth steppe
; North slope
; Paleoenvironments
; Pleistocene
; Sand sheet
; Yedoma
; Ice
; climate effect
; climate variation
; continental slope
; environmental change
; eolian process
; floodplain
; interstadial
; Last Glacial Maximum
; loess
; paleoenvironment
; permafrost
; Pleistocene
; proxy climate record
; sedimentology
; steppe
; stratigraphy
; Alaska
; Arctic
; United States
英文摘要: Terrestrial paleoenvironmental records with high dating resolution extending into the last ice age are rare from the western Arctic. Such records can test the synchronicity and extent of ice-age climatic events and define how Arctic landscapes respond to rapid climate changes. Here we describe the stratigraphy and sedimentology of a yedoma deposit in Arctic Alaska (the Carter Section) dating to between 37,000 and 9000 calibrated radiocarbon years BP (37–9 ka) and containing detailed records of loess and sand-sheet sedimentation, soil development, carbon storage, and permafrost dynamics. Alternation between sand-sheet and loess deposition provides a proxy for the extent and activity of the Ikpikpuk Sand Sea (ISS), a large dune field located immediately upwind. Warm, moist interstadial times (ca. 37, 36.3–32.5, and 15–13 ka) triggered floodplain aggradation, permafrost thaw, reduced loess deposition, increased vegetation cover, and rapid soil development accompanied by enhanced carbon storage. During the Last Glacial Maximum (LGM, ca. 28–18 ka), rapid loess deposition took place on a landscape where vegetation was sparse and non-woody. The most intense aeolian activity occurred after the LGM between ca. 18 and 15 ka when sand sheets fringing the ISS expanded over the site, possibly in response to increasingly droughty conditions as summers warmed and active layers deepened. With the exception of this lagged LGM response, the record of aeolian activity at the Carter Section correlates with other paleoenvironmental records from unglaciated Siberia and Alaska. Overall, rapid shifts in geomorphology, soils, vegetation, and permafrost portray an ice-age landscape where, in contrast to the Holocene, environmental change was chronic and dominated by aeolian processes. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112307
Appears in Collections: 气候减缓与适应
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作者单位: Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9w, Palisades, NY 10964, United States; Department of Geosciences, University of Alaska Fairbanks, 900 Yukon Dr., Fairbanks, AK 99775, United States; Institute of Arctic Biology, University of Alaska Fairbanks, 902 North Koyukuk Dr., Fairbanks, AK 99775, United States; School of Natural Resources and Extension, University of Alaska Fairbanks, P.O. Box 757140, Fairbanks, AK 99775, United States; Reanier & Associates Inc., 1215 SW 170th St., Seattle, WA 98166, United States; Alaska Science Center, US Geological Survey, 4210 University Dr., Anchorage, AK 99508, United States; Water and Environmental Research Center & School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, 306 Tanana Dr., Fairbanks, AK 99775, United States
Recommended Citation:
Gaglioti B.V.,Mann D.H.,Groves P.,et al. Aeolian stratigraphy describes ice-age paleoenvironments in unglaciated Arctic Alaska[J]. Quaternary Science Reviews,2018-01-01,182