globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.10.001
Scopus记录号: 2-s2.0-84991585368
论文题名:
Episodic expansion of Drangajökull, Vestfirðir, Iceland, over the last 3 ka culminating in its maximum dimension during the Little Ice Age
作者: Harning D.J.; Geirsdóttir Á.; Miller G.H.; Anderson L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 152
起始页码: 118
结束页码: 131
语种: 英语
英文关键词: Dead vegetation ; Drangajökull ; Glaciers ; Iceland ; Lake sediment ; Little Ice Age ; Moraines ; Paleoclimate ; Sea ice
Scopus关键词: Biology ; Catchments ; Climate change ; Glacial geology ; Glaciers ; Lakes ; Sea ice ; Sediments ; Snow ; Soils ; Vegetation ; Icelands ; Lake sediments ; Little Ice Age ; Moraines ; Paleoclimates ; Ice
英文摘要: Non-linear climate change is often linked to rapid changes in ocean circulation, especially around the North Atlantic. As the Polar Front fluctuated its latitudinal position during the Holocene, Iceland's climate was influenced by both the warm Atlantic currents and cool, sea ice-bearing Arctic currents. Drangajökull is Iceland's fifth largest ice cap. Climate proxies in lake sediment cores, dead vegetation emerging from beneath the ice cap, and moraine segments identified in a new DEM constrain the episodic expansion of the ice cap over the past 3 ka. Collectively, our data show that Drangajökull was advancing at ∼320 BCE, 180 CE, 560 CE, 950 CE and 1400 CE and in a state of recession at ∼450 CE, 1250 CE and after 1850 CE. The Late Holocene maximum extent of Drangajökull occurred during the Little Ice Age (LIA), occupying 262 km2, almost twice its area in 2011 CE and ∼20% larger than recent estimates of its LIA dimensions. Biological proxies from the sediment fill in a high- and low-elevation lake suggest limited vegetation and soil cover at high elevations proximal to the ice cap, whereas thick soil cover persisted until ∼750 CE at lower elevations near the coast. As Drangajökull expanded into the catchment of the high-elevation lake beginning at ∼950 CE, aquatic productivity diminished, following a trend of regional cooling supported by proxy records elsewhere in Iceland. Correlations between episodes of Drangajökull's advance and the documented occurrence of drift ice on the North Icelandic Shelf suggest export and local production of sea ice influenced the evolution of NW Iceland's Late Holocene climate. © 2016 Elsevier Ltd
资助项目: This project was supported by RANNIS (grant #130775051) and the ANATILS RANNIS Grant-of-Excellence (grant #141573-052) awarded by the Icelandic Center for Research to ÁG and GHM. We thank Brian Harning for assistance in dead vegetation collection, Devin Hougardy and the University of Minnesota Duluth for lake seismic surveys, and þorsteinn Jónsson and Sveinbjörn Steinþórsson for diligent lake coring. Siggi and Áslaug are thanked for their warm hospitality during fieldwork at the road's end in Dalbær, west of the ice cap. Joaquín M.C. Belart constructed the southern margin DEM, for which his help is greatly appreciated. The manuscript benefitted from fruitful discussions with John Andrews, Sarah Crump, Chris Florian, Sydney Gunnarson, Steffen Mischke, Simon Pendleton, Tayo van Boeckel, þorvaldur þórðarson and the rest of the ANATILS working group. We also thank two anonymous reviewers for their constructive comments, which helped strengthen the manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59397
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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.,et al. Episodic expansion of Drangajökull, Vestfirðir, Iceland, over the last 3 ka culminating in its maximum dimension during the Little Ice Age[J]. Quaternary Science Reviews,2016-01-01,152
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