气候变化领域集成服务门户(CCPortal): A geomorphology based reconstruction of ice volume distribution at the Last Glacial Maximum across the Southern Alps of New Zealand

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DOI	10.1016/j.quascirev.2019.06.035
	A geomorphology based reconstruction of ice volume distribution at the Last Glacial Maximum across the Southern Alps of New Zealand
	James W.H.M.; Carrivick J.L.; Quincey D.J.; Glasser N.F.
发表日期	2019
ISSN	0277-3791
起始页码	20
结束页码	35
卷号	219
英文摘要	We present a 3D reconstruction of ice thickness distribution across the New Zealand Southern Alps at the Last Glacial Maximum (LGM, c. 30–18 ka). To achieve this, we used a perfect plasticity model which could easily be applied to other regions, hereafter termed REVOLTA (Reconstruction of Volume and Topography Automation). REVOLTA is driven by a Digital Elevation Model (DEM), which was modified to best represent LGM bed topography. Specifically, we removed contemporary ice, integrated offshore bathymetry and removed contemporary lakes. A review of valley in-fill sediments, uplift and denudation was also undertaken. Down-valley ice extents were constrained to an updated geo-database of LGM ice limits, whilst the model was tuned to best-fit known vertical limits from geomorphological and geochronological dating studies. We estimate a total LGM ice volume of 6,800 km3, characterised predominantly by valley style glaciation but with an ice cap across Fiordland. With a contemporary ice volume of approximately 50 km3, this represents a loss of 99.25% since the LGM. Using the newly created ice surface, equilibrium line altitudes (ELAs) for each glacier were reconstructed, revealing an average ELA depression of approximately 950 m from present. Analysis of the spatial variation of glacier-specific ELAs and their depression relative to today shows that whilst an east-west ELA gradient existed during the LGM it was less pronounced than at present. The reduced ELA gradient is attributed to an overall weakening of westerlies, a conclusion consistent with those derived from the latest independent climate models. © 2019 The Authors
英文关键词	Geomorphology; Glacial; Glaciation; Glaciology; Quaternary; Southern pacific
语种	英语
scopus关键词	Climate models; Geochronology; Geomorphology; Glacial geology; Landforms; Offshore oil well production; Surveying; Topography; Glacial; Glaciation; Glaciology; Quaternary; Southern pacific; Ice; bathymetry; denudation; equilibrium line; geomorphology; ice cap; ice thickness; Last Glacial Maximum; reconstruction; sea ice; spatial variation; uplift; Fiordland; New Zealand; Pacific Ocean; Pacific Ocean (South); South Island; Southern Alps; Southland
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151832
作者单位	School of Geography and Leeds Institute for Data Analytics, University of Leeds, Leeds, West Yorkshire LS2 9JT, United Kingdom; School of Geography and water@leeds, University of Leeds, Leeds, West Yorkshire LS2 9JT, United Kingdom; Department of Geography and Earth Sciences, Aberystwyth UniversityWales SY23 3DB, United Kingdom
推荐引用方式 GB/T 7714	James W.H.M.,Carrivick J.L.,Quincey D.J.,et al. A geomorphology based reconstruction of ice volume distribution at the Last Glacial Maximum across the Southern Alps of New Zealand[J],2019,219.
APA	James W.H.M.,Carrivick J.L.,Quincey D.J.,&Glasser N.F..(2019).A geomorphology based reconstruction of ice volume distribution at the Last Glacial Maximum across the Southern Alps of New Zealand.Quaternary Science Reviews,219.
MLA	James W.H.M.,et al."A geomorphology based reconstruction of ice volume distribution at the Last Glacial Maximum across the Southern Alps of New Zealand".Quaternary Science Reviews 219(2019).