DOI: 10.1016/j.quascirev.2015.02.007
Scopus记录号: 2-s2.0-84924032425
论文题名: Reconstructing Holocene glacier activity at Langfjordjøkelen, Arctic Norway, using multi-proxy fingerprinting of distal glacier-fed lake sediments
作者: Wittmeier H.E. ; Bakke J. ; Vasskog K. ; Trachsel M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 114 起始页码: 78
结束页码: 99
语种: 英语
英文关键词: Arctic Norway
; Glaciers
; Holocene glacier activity
; Lake sediments
; Langfjordjøkelen
; Late Glacial
; PCA
Scopus关键词: Climate change
; Glacial geology
; Glaciers
; Ice
; Lakes
; Magnetic susceptibility
; Sediments
; Snow
; Arctic Norway
; Holocenes
; Lake sediments
; Late Glacial
; PCA
; Principal component analysis
; climate variation
; glacial deposit
; Holocene
; lacustrine deposit
; proxy climate record
; Arctic Ocean
; Langfjordjokelen
; Norway
; Norway
英文摘要: Late Glacial and Holocene glacier fluctuations are important indicators of climate variability in the northern polar region and contain knowledge vital to understanding and predicting present and future climate changes. However, there still is a lack of robustly dated terrestrial climate records from Arctic Norway. Here, we present a high-resolution relative glacier activity record covering the past ~10,000cal. a BP from the northern outlet of the Langfjordjøkelen ice cap in Arctic Norway. This record is reconstructed from detailed geomorphic mapping, multi-proxy sedimentary fingerprinting and analyses of distal glacier-fed lake sediments. We used Principal Component Analysis to characterize sediments of glacial origin and trace them in a chain of downstream lakes. Of the variability in the sediment record of the uppermost Lake Jøkelvatnet, 73% can be explained by the first Principal Component axis and tied directly to upstream glacier erosion, whereas the glacial signal becomes weaker in the more distal Lakes Store Rundvatnet and Storvatnet. Magnetic susceptibility and titanium count rates were found to be the most suitable indicators of Holocene glacier activity in the distal glacier-fed lakes. The complete deglaciation of the valley of Sør-Tverrfjorddalen occurred ~10,000cal. a BP, followed by a reduced or absent glacier during the Holocene Thermal Optimum. The Langfjordjøkelen ice cap reformed with the onset of the Neoglacial ~4100cal. a BP, and the gradually increasing glacier activity culminated at the end of the Little Ice Age in the early 20th century. Over the past 2000cal. a BP, the record reflects frequent high-amplitude glacier fluctuations. Periods of reduced glacier activity were centered around 1880, 1600, 1250 and 950cal. a BP, while intervals of increased glacier activity occurred around 1680, 1090, 440 and 25cal. a BP. The large-scale Holocene glacier activity of the Langfjordjøkelen ice cap is consistent with regional temperature proxy reconstructions and glacier variability across Norway. Long-term changes in the extent of the northern outlet of the Langfjordjøkelen ice cap largely followed trends in regional summer temperatures, whereas winter season atmospheric variability may have triggered decadal-scale glacial fluctuations and generally affected the amplitude of glacier events. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59962
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Science, University of Bergen, Allégaten 41, Bergen, Norway; Bjerknes Centre for Climate Research, Allégaten 70, Bergen, Norway; Uni Climate, Uni Research, Allégaten 55, Bergen, Norway; Department of Biology, University of Bergen, Thormøhlensgate 53A, Bergen, Norway
Recommended Citation:
Wittmeier H.E.,Bakke J.,Vasskog K.,et al. Reconstructing Holocene glacier activity at Langfjordjøkelen, Arctic Norway, using multi-proxy fingerprinting of distal glacier-fed lake sediments[J]. Quaternary Science Reviews,2015-01-01,114