气候变化领域集成服务门户(CCPortal): Insights into subtropical Australian aridity from Welsby Lagoon; north Stradbroke Island; over the past 80;000 years

CCPortal

DOI	10.1016/j.quascirev.2020.106262
	Insights into subtropical Australian aridity from Welsby Lagoon; north Stradbroke Island; over the past 80;000 years
	Lewis R.J.; Tibby J.; Arnold L.J.; Barr C.; Marshall J.; McGregor G.; Gadd P.; Yokoyama Y.
发表日期	2020
ISSN	0277-3791
卷号	234
英文摘要	Terrestrial sedimentary archives that record environmental responses to climate over the last glacial cycle are underrepresented in subtropical Australia. Limited spatial and temporal palaeoenvironmental record coverage across large parts of eastern Australia contribute to uncertainty regarding the relationship between long-term climate change and palaeoecological turnover; including the extinction of Australian megafauna during the late Pleistocene. This study presents a new, high-resolution, calibrated geochemical record and numerical dating framework from Welsby Lagoon, a wetland from North Stradbroke Island that records key periods of late Pleistocene environmental change. Single-grain optically stimulated luminescence and radiocarbon dating are integrated into a Bayesian age-depth model for the sedimentary sequence spanning Marine Isotope Stage (MIS) 5 to the present. Scanning micro X-ray fluorescence (XRF) and bulk sediment XRF assays are used to infer past dust dynamics, with changes in the abundance of silica and potassium interpreted as proxies for aridity across local and regional sources. Variations in dust flux were contemporaneous with hydrological change, concordant with changes in vegetation cover on the island and, relate to deflation events at major dust source regions on the Australian continent. The Welsby Lagoon record supports the notion of a variable MIS4 within which an increased dust flux (71–67 ka), may be indicative of drier climate. Additionally, the record also shows a lower dust flux through the Last Glacial Maximum (LGM) than is evident in other Australian aeolian records. However, this low LGM flux is attributed to the wetland's evolution, rather than a reduction in total dust flux. © 2020 Elsevier Ltd
英文关键词	Aeolian deposition; Australia; Dust; Geochronology; Last glacial maximum; Optical methods; Optically stimulated luminescence dating; Palaeolimnology; Quaternary
语种	英语
scopus关键词	Dust; Geochronology; Glacial geology; Lakes; Luminescence; Sedimentology; Silica; Tropics; Wetlands; Aeolian deposition; Australia; Last Glacial Maximum; Optical methods; Optically stimulated luminescence; Palaeolimnology; Quaternary; Climate change; aridity; climate change; dust; eolian deposit; geochronology; Last Glacial Maximum; paleolimnology; Pleistocene; Quaternary; radiocarbon dating; sedimentary sequence; vegetation cover; wetland; Australia; North Stradbroke Island; Queensland
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/151536
作者单位	Department of Earth Sciences, School of Physical Sciences, University of Adelaide, North TerraceSouth Australia 5005, Australia; Sprigg Geobiology Centre, University of Adelaide, North TerraceSouth Australia 5005, Australia; Department of Geography, Environment and Population, University of Adelaide, North TerraceSouth Australia 5005, Australia; Environment Institute, and Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, North Terrace Campus, Adelaide, SA 5005, Australia; Australian Nuclear Science and Technology Organisation (ANSTO), Locked Bag 2001, Kirrawee DCNSW 2232, Australia; Department of Environment and Science, Queensland Government, GPO Box 2454., Brisbane, Queensland 4001, Australia; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, 277-8564, Japan; Australian Rivers Institute, Griffith University, NathanQueensland 4111, Australia
推荐引用方式 GB/T 7714	Lewis R.J.,Tibby J.,Arnold L.J.,et al. Insights into subtropical Australian aridity from Welsby Lagoon; north Stradbroke Island; over the past 80;000 years[J],2020,234.
APA	Lewis R.J..,Tibby J..,Arnold L.J..,Barr C..,Marshall J..,...&Yokoyama Y..(2020).Insights into subtropical Australian aridity from Welsby Lagoon; north Stradbroke Island; over the past 80;000 years.Quaternary Science Reviews,234.
MLA	Lewis R.J.,et al."Insights into subtropical Australian aridity from Welsby Lagoon; north Stradbroke Island; over the past 80;000 years".Quaternary Science Reviews 234(2020).