DOI: 10.1016/j.quascirev.2013.03.009
Scopus记录号: 2-s2.0-84876381328
论文题名: Evolution of NAO and AMO strength and cyclicity derived from a 3-ka varve-thickness record from Iceland
作者: Ólafsdóttir K.B. ; Geirsdóttir T. ; Miller G.H. ; Larsen D.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 69 起始页码: 142
结束页码: 154
语种: 英语
英文关键词: Atlantic Multidecadal Oscillation
; Little Ice Age
; North Atlantic Oscillation
; Spectral Analysis
; Varves
Scopus关键词: Atlantic multidecadal oscillations
; Climate parameters
; Interannual variation
; Little Ice Age
; Low frequency variability
; North Atlantic oscillations
; Summer temperature
; Varves
; Atmospheric pressure
; Ice
; Sedimentology
; Spectrum analysis
; Lakes
; annual variation
; Atlantic Multidecadal Oscillation
; cyclicity
; erosion rate
; glacial erosion
; Holocene
; lacustrine deposit
; North Atlantic Oscillation
; spectral analysis
; varve
; Iceland
英文摘要: A 3000-year varve-thickness record from Hvítárvatn, a glacier-dominated lake in central Iceland, preserves inter-annual variations in the delivery of glacially eroded sediment to the lake. The first-order low-frequency trend in varve thickness reflects increased glacial erosion through the Late Holocene, reaching a peak during the Little Ice Age (LIA). Superimposed on this trend are large inter-annual to decadal fluctuations in varve thickness that we suggest reflect variability in climate parameters that determine the efficiency of the fluvial transport system to deliver glacially eroded sediment to the lake each year. We use spectral analysis to test whether regular high-frequency cyclicity in varve thickness exists in the 3-ka record after removing the low-frequency variability. Spectral analyses from three sediment cores recovered from the lake show essentially the same periods of 2.8-3.4, 13, 35-40 and 85-93, for the overlapping ~900-year period. Additionally, cycles of 55, 130 and 290 years are found in the spectrum for the 3000-year record that do not show up in the spectra for the shorter cores. Some of these cycles show similar variability to those of the North Atlantic Oscillation (NAO) and Atlantic Multidecadal Oscillation (AMO). This relationship is supported by a significant correlation between varve thickness and both the NAO (precipitation) and AMO (summer temperature) indices over the 180-year instrumental period. NAO cyclicities (2-15 years) are weakly expressed in the first half of the record, increase between 600 and 1000 AD, decrease in strength during medieval time, and are most strongly expressed between 1300 AD and the early 20th century. AMO cyclicities (50 to 130 years) are also relatively weak in the first half of the record, becoming quite strong between 600 and 1000 AD and again between 1100 and 1500 AD, but are essentially absent through the peak of the LIA, between 1500 and 1900 AD, a time when strong cyclicities of about 35 years appear. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60645
Appears in Collections: 过去全球变化的重建
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作者单位: Schneiderberg 26, 30167 Hannover, Germany; Institute of Earth Sciences, University of Iceland, Sturlugata 7, Reykjavík 101, Iceland; INSTAAR/Department of Geological Sciences, University of Colorado, UCB 450, Boulder, CO 80309, United States
Recommended Citation:
Ólafsdóttir K.B.,Geirsdóttir T.,Miller G.H.,et al. Evolution of NAO and AMO strength and cyclicity derived from a 3-ka varve-thickness record from Iceland[J]. Quaternary Science Reviews,2013-01-01,69