DOI: 10.1016/j.quascirev.2015.05.004
Scopus记录号: 2-s2.0-84930226104
论文题名: Lake Store Finnsjøen - a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains
作者: Paus A. ; Boessenkool S. ; Brochmann C. ; Epp L.S. ; Fabel D. ; Haflidason H. ; Linge H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 121 起始页码: 36
结束页码: 51
语种: 英语
英文关键词: Beryllium-10 surface exposure ages
; Central Scandes
; Deglaciation
; Early Holocene
; Ice models
; Lateglacial
; Pollen
; Sedimentary ancient DNA
; Stratigraphy
; Vegetation development
Scopus关键词: Catchments
; Forestry
; Glacial geology
; Lakes
; Landforms
; Plant shutdowns
; Plants (botany)
; Sedimentology
; Sediments
; Snow
; Stratigraphy
; Vegetation
; Ancient dnas
; Central Scandes
; Deglaciations
; Early Holocene
; Ice model
; Lateglacial
; Pollen
; Surface exposure age
; Ice
; coniferous tree
; deciduous tree
; DNA
; glacial-interglacial cycle
; ice sheet
; lacustrine deposit
; lamination
; late glacial
; microfossil
; palynology
; Preboreal
; radiocarbon dating
; vegetation dynamics
; Younger Dryas
; Ice
; Mountains
; Plants
; Sediments
; Finnsjon
; Norway
; Scandes Mountains
; Sweden
; Uppsala [Sweden]
; Artemisia norvegica
; Betula nana
; Campanula uniflora
; Empetrum nigrum
; Juniperus
; Koenigia
; Oxyria
; Papaver
; Salix
; Salix polaris
; Saxifraga
; Silene acaulis
英文摘要: The Lateglacial (LG) deglaciation and vegetation development in the Scandes Mountains has been debated for a century. Here we present new evidence from microfossils, radiocarbon dated plant macrofossils and sedimentary ancient DNA from laminated sediments in Lake Store Finnsjøen (1260ma.s.l.) at Dovre, Central Norway. Combined with previous results from three other Dovre lakes, this allows for new interpretations of events during and immediately after the LG deglaciation. The Finnsjøen sediments present the first uninterrupted record of local vegetation development in the Scandes Mountains from the late Younger Dryas (YD), ca 12,000calyearsBP, to the early Holocene around 9700calyearsBP. The local vegetation in late YD/early Holocene was extremely sparse with pioneer herbs (e.g. Artemisia norvegica, Beckwithia, Campanula cf. uniflora, Koenigia, Oxyria, Papaver, Saxifraga spp.) and dwarf-shrubs (. Betula nana, Salix including Salix polaris). From 11,300calyearsBP, local vegetation rapidly closed with dominant Dryas, Saxifraga spp., and Silene acaulis. From ca 10,700calyears BP, open birch-forests with juniper, Empetrum nigrum and other dwarf-shrubs developed. Pine forests established within the area from 10,300calyearsBP. We identified the cold Preboreal Oscillation (PBO), not earlier described from pollen data in South Norway, around 11,400calyearsBP by a regional pollen signal. Distinct local vegetation changes were not detected until the post-PBO warming around 11,300calyearsBP. Apparently, the earlier warming at the YD/Holocene transition at 11,650calyearsBP was too weak and short-lived for vegetation closure at high altitudes at Dovre. For the first time, we demonstrate a regional glacier readvance and local ice cap formations during the YD in the Scandes Mountains. In two of the deep lakes with small catchments, YD glaciation blocked sedimentation without removing old sediments and caused a hiatus separating sediments of the ice-free LG interstadial (LGI) from those of the ice-free Holocene period. Both regional glaciers and local ice caps caused hiati. Ice-free pre-YD conditions at Dovre followed by a YD readvance point to a scenario that is intermediate between the maximum ice model postulating a thick glacier during the entire LG, and the minimum ice model postulating thin and multi-domed early LG ice. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59903
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Biology, University of Bergen, P.O. Box 7803, Thormøhlens Gate 53 A, Bergen, Norway; Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, Oslo, Norway; School of Geographical and Earth Sciences, University of Glasgow, Glasgow, Scotland, United Kingdom; Department of Earth Science, University of Bergen, and Bjerknes Centre for Climate Research, P.O. Box 7803, Bergen, Norway; Centre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, Oslo, Norway; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research, Am Telegrafenberg A43, Potsdam, Germany
Recommended Citation:
Paus A.,Boessenkool S.,Brochmann C.,et al. Lake Store Finnsjøen - a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains[J]. Quaternary Science Reviews,2015-01-01,121