DOI: 10.1016/j.quascirev.2018.04.009
Scopus记录号: 2-s2.0-85045379333
论文题名: Punctuated Holocene climate of Vestfirðir, Iceland, linked to internal/external variables and oceanographic conditions
作者: Harning D.J. ; Geirsdóttir Á. ; Miller G.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 189 起始页码: 31
结束页码: 42
语种: 英语
英文关键词: 8.2 ka event
; Dead vegetation
; Glaciers
; Holocene
; Iceland
; Lake sediment
; Little Ice Age
; Neoglaciation
; North Atlantic
; Paleoclimate
Scopus关键词: Glacial geology
; Glaciers
; Lakes
; Productivity
; Sediments
; Silicon compounds
; Vegetation
; 8.2 ka event
; Holocenes
; Icelands
; Lake sediments
; Little Ice Age
; Neoglaciation
; North Atlantic
; Paleoclimates
; Boron compounds
; climate conditions
; climate feedback
; climate forcing
; cooling
; glacier
; historical record
; Holocene
; ice cap
; lacustrine deposit
; Little Ice Age
; marine environment
; Neoglacial
; paleoclimate
; proxy climate record
; reconstruction
; vegetation history
; Arctic Ocean
; Atlantic Ocean
; Atlantic Ocean (North)
; Iceland
; North Icelandic Shelf
; Vestfirdir
; algae
; Bacillariophyta
英文摘要: Emerging Holocene paleoclimate datasets point to a non-linear response of Icelandic climate against a background of steady orbital cooling. The Vestfirðir peninsula (NW Iceland) is an ideal target for continued climate reconstructions due to the presence of a small ice cap (Drangajökull) and numerous lakes, which provide two independent means to evaluate existing Icelandic climate records and to constrain the forcing mechanisms behind centennial-scale cold anomalies. Here, we present new evidence for Holocene expansions of Drangajökull based on 14C dates from entombed dead vegetation as well as two continuous Holocene lake sediment records. Lake sediments were analyzed for both bulk physical (MS) and biological (%TOC, δ13C, C/N, and BSi) parameters. Composite BSi and C/N records from the two lakes yield a sub-centennial qualitative perspective on algal (diatom) productivity and terrestrial landscape stability, respectively. The Vestfirðir lake proxies suggest initiation of the Holocene Thermal Maximum by ∼8.8 ka with subsequent and pronounced cooling not apparent until ∼3 ka. Synchronous periods of reduced algal productivity and accelerated landscape instability point to cold anomalies centered at ∼8.2, 6.6, 4.2, 3.3, 2.3, 1.8, 1, and 0.25 ka. Triggers for cold anomalies are linked to variable combinations of freshwater pulses, low total solar irradiance, explosive and effusive volcanism, and internal modes of climate variability, with cooling likely sustained by ocean/sea-ice feedbacks. The climate evolution reflected by our glacial and organic proxy records corresponds closely to marine records from the North Iceland Shelf. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112198
Appears in Collections: 气候减缓与适应
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作者单位: Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland; INSTAAR and Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Harning D.J.,Geirsdóttir Á.,Miller G.H.. Punctuated Holocene climate of Vestfirðir, Iceland, linked to internal/external variables and oceanographic conditions[J]. Quaternary Science Reviews,2018-01-01,189