DOI: 10.1016/j.quascirev.2014.11.005
Scopus记录号: 2-s2.0-84911899901
论文题名: Sea-level changes in Iceland and the influence of the North Atlantic Oscillation during the last half millennium
作者: Saher M.H. ; Gehrels W.R. ; Barlow N.L.M. ; Long A.J. ; Haigh I.D. ; Blaauw M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 108 起始页码: 23
结束页码: 36
语种: 英语
英文关键词: Diatoms
; Iceland
; Little ice age
; NAO
; Ocean dynamics
; Sea-level rise
Scopus关键词: Atmospheric pressure
; Glacial geology
; Tectonics
; Tide gages
; Wetlands
; Diatoms
; Icelands
; Little Ice Age
; NAO
; Ocean dynamics
; Sea level rise
; Sea level
; air-sea interaction
; data set
; foraminifera
; low pressure
; North Atlantic Oscillation
; reconstruction
; sea level change
; timescale
; wind forcing
; Iceland
; Bacillariophyta
英文摘要: We present a new, diatom-based sea-level reconstruction for Iceland spanning the last ~500 years, and investigate the possible mechanisms driving the sea-level changes. A sea-level reconstruction from near the Icelandic low pressure system is important as it can improve understanding of ocean-atmosphere forcing on North Atlantic sea-level variability over multi-decadal to centennial timescales. Our reconstruction is from Viarhólmi salt marsh in Snæfellsnes in western Iceland, a site from where we previously obtained a 2000-yr record based upon less precise sea-level indicators (salt-marsh foraminifera). The 20th century part of our record is corroborated by tide-gauge data from Reykjavik. Overall, the new reconstruction shows ca0.6m rise of relative sea level during the last four centuries, of which ca0.2m occurred during the 20th century. Low-amplitude and high-frequency sea-level variability is super-imposed on the pre-industrial long-term rising trend of 0.65m per 1000 years. Most of the relative sea-level rise occurred in three distinct periods: AD 1620-1650, AD 1780-1850 and AD 1950-2000, with maximum rates of ~3±2mm/yr during the latter two of these periods. Maximum rates were achieved at the end of large shifts (from negative to positive) of the winter North Atlantic Oscillation (NAO) Index as reconstructed from proxy data. Instrumental data demonstrate that a strong and sustained positive NAO (a deep Icelandic Low) generates setup on the west coast of Iceland resulting in rising sea levels. There is no strong evidence that the periods of rapid sea-level rise were caused by ocean mass changes, glacial isostatic adjustment or regional steric change. We suggest that wind forcing plays an important role in causing regional-scale coastal sea-level variability in the North Atlantic, not only on (multi-)annual timescales, but also on multi-decadal to centennial timescales. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60049
Appears in Collections: 过去全球变化的重建
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作者单位: School of Ocean Sciences, Bangor University, Menai Bridge, United Kingdom; Environment Department, University of York, Heslington, York, United Kingdom; Department of Geography, Durham University, South Road, Durham, United Kingdom; Ocean and Earth Science, National Oceanography Centre, University of Southampton, European Way Southampton, United Kingdom; School of Geography, Archaeology and Palaeoecology, Queen's University Belfast, Elmwood Avenue, Belfast, United Kingdom
Recommended Citation:
Saher M.H.,Gehrels W.R.,Barlow N.L.M.,et al. Sea-level changes in Iceland and the influence of the North Atlantic Oscillation during the last half millennium[J]. Quaternary Science Reviews,2015-01-01,108