气候变化领域集成服务门户(CCPortal): Pleistocene glacial history of the New Zealand subantarctic islands

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DOI	10.5194/cp-15-423-2019
	Pleistocene glacial history of the New Zealand subantarctic islands
	Rainsley E.; Turney C.S.M.; Golledge N.R.; Wilmshurst J.M.; McGlone M.S.; Hogg A.G.; Li B.; Thomas Z.A.; Roberts R.; Jones R.T.; Palmer J.G.; Flett V.; De Wet G.; Hutchinson D.K.; Lipson M.J.; Fenwick P.; Hines B.; Binetti U.; Fogwill C.J.
发表日期	2019
ISSN	18149324
起始页码	423
结束页码	448
卷号	15 期号:2
英文摘要	The New Zealand subantarctic islands of Auckland and Campbell, situated between the subtropical front and the Antarctic Convergence in the Pacific sector of the Southern Ocean, provide valuable terrestrial records from a globally important climatic region. Whilst the islands show clear evidence of past glaciation, the timing and mechanisms behind Pleistocene environmental and climate changes remain uncertain. Here we present a multidisciplinary study of the islands-including marine and terrestrial geomorphological surveys, extensive analyses of sedimentary sequences, a comprehensive dating programme, and glacier flow line modelling-to investigate multiple phases of glaciation across the islands. We find evidence that the Auckland Islands hosted a small ice cap 384 000±26 000 years ago (384±26 ka), most likely during Marine Isotope Stage 10, a period when the subtropical front was reportedly north of its present-day latitude by several degrees, and consistent with hemispheric-wide glacial expansion. Flow line modelling constrained by field evidence suggests a more restricted glacial period prior to the LGM that formed substantial valley glaciers on the Campbell and Auckland Islands around 72-62 ka. Despite previous interpretations that suggest the maximum glacial extent occurred in the form of valley glaciation at the Last Glacial Maximum (LGM; ∼ 21 ka), our combined approach suggests minimal LGM glaciation across the New Zealand subantarctic islands and that no glaciers were present during the Antarctic Cold Reversal (ACR; ∼ 15-13 ka). Instead, modelling implies that despite a regional mean annual air temperature depression of ∼ 5 °C during the LGM, a combination of high seasonality and low precipitation left the islands incapable of sustaining significant glaciation. We suggest that northwards expansion of winter sea ice during the LGM and subsequent ACR led to precipitation starvation across the middle to high latitudes of the Southern Ocean, resulting in restricted glaciation of the subantarctic islands. © 2019 Author(s).
语种	英语
scopus关键词	air temperature; annual variation; glacial history; glaciation; Last Glacial Maximum; latitude; precipitation (climatology); sea ice; seasonality; subantarctic region; valley glacier; Auckland Islands; Pacific Ocean; Southern Ocean
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146845
作者单位	ICELAB, School of Geography, Geology and the Environment, University of Keele, Staffordshire, ST55BG, United Kingdom; Palaeontology, Geobiology and Earth Archives Research Centre (PANGEA), School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, Australia; Australian Research Council, Centre of Excellence for Australian Biodiversity and Heritage (CABAH), University of New South WalesNSW 2052, Australia; Antarctic Research Centre, Victoria University of Wellington, Wellington, 6140, New Zealand; GNS Science, Avalon-Lower-Hutt, 5011, New Zealand; Long Term Ecology Laboratory, Landcare Research, Lincoln, New Zealand; School of Environment, University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand; Waikato Radiocarbon Laboratory, University of Waikato, Private Bag 3105, Hamilton, New Zealand; Australian Research Council (ARC), Centre of Excellence for Australian Biodiversity and Heritage, University of Waikato, Hamilton, 3240, New Zealand; Centre for Archaeo...
推荐引用方式 GB/T 7714	Rainsley E.,Turney C.S.M.,Golledge N.R.,et al. Pleistocene glacial history of the New Zealand subantarctic islands[J],2019,15(2).
APA	Rainsley E..,Turney C.S.M..,Golledge N.R..,Wilmshurst J.M..,McGlone M.S..,...&Fogwill C.J..(2019).Pleistocene glacial history of the New Zealand subantarctic islands.Climate of the Past,15(2).
MLA	Rainsley E.,et al."Pleistocene glacial history of the New Zealand subantarctic islands".Climate of the Past 15.2(2019).