DOI: 10.1016/j.quascirev.2014.07.017
Scopus记录号: 2-s2.0-85027923765
论文题名: A tephra lattice for Greenland and a reconstruction of volcanic events spanning 25-45 ka b2k
作者: Bourne A.J. ; Cook E. ; Abbott P.M. ; Seierstad I.K. ; Steffensen J.P. ; Svensson A. ; Fischer H. ; Schüpbach S. ; Davies S.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 118 起始页码: 122
结束页码: 141
语种: 英语
英文关键词: Cryptotephra
; Greenland ice-cores
; Iceland
; Rapid climate changes
; Tephrochronological framework
; Tephrostratigraphy
Scopus关键词: Climate change
; Deposits
; Glacial geology
; Salinity measurement
; Stratigraphy
; Volcanoes
; Cryptotephra
; Greenland ice cores
; Icelands
; Rapid climate change
; Tephrochronological framework
; Tephrostratigraphy
; Ice
; climate variation
; Dansgaard-Oeschger cycle
; GRIP
; ice community
; ice core
; Last Glacial
; lattice dynamics
; NorthGRIP
; paleoclimate
; reconstruction
; synchrony
; tephra
; tephrochronology
; volcanic eruption
; volcanic glass
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Greenland
; Grimsvotn
; Iceland
; Kverkfjoll
英文摘要: Tephra layers preserved within the Greenland ice-cores are crucial for the independent synchronisation of these high-resolution records to other palaeoclimatic archives. Here we present a new and detailed tephrochronological framework for the time period 25,000-45,000 a b2k that brings together results from 4 deep Greenland ice-cores. In total, 99 tephra deposits, the majority of which are preserved as cryptotephra, are described from the NGRIP, NEEM, GRIP and DYE-3 records. The major element signatures of single glass shards within these deposits indicate that 93 are basaltic in composition all originating from Iceland. Specifically, 43 originate from Grimsvötn, 20 are thought to be sourced from the Katla volcanic system and 17 show affinity to the Kverkfjöll system. Robust geochemical characterisations, independent ages derived from the GICC05 ice-core chronology, and the stratigraphic positions of these deposits relative to the Dansgaard-Oeschger climate events represent a key framework that provides new information on the frequency and nature of volcanic events in the North Atlantic region between GS-3 and GI-12. Of particular importance are 19 tephra deposits that lie on the rapid climatic transitions that punctuate the last glacial period. This framework of well-constrained, time-synchronous tie-lines represents an important step towards the independent synchronisation of marine, terrestrial and ice-core records from the North Atlantic region, in order to assess the phasing of rapid climatic changes during the last glacial period. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60070
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, College of Science, Swansea University, Swansea, United Kingdom; Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Denmark; Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland
Recommended Citation:
Bourne A.J.,Cook E.,Abbott P.M.,et al. A tephra lattice for Greenland and a reconstruction of volcanic events spanning 25-45 ka b2k[J]. Quaternary Science Reviews,2015-01-01,118