DOI: 10.1016/j.quascirev.2018.05.031
Scopus记录号: 2-s2.0-85047818586
论文题名: Millennial-scale variability in south-east Australian hydroclimate between 30,000 and 10,000 years ago
作者: Falster G. ; Tyler J. ; Grant K. ; Tibby J. ; Turney C. ; Löhr S. ; Jacobsen G. ; Kershaw A.P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 192 起始页码: 106
结束页码: 122
语种: 英语
英文关键词: Australasia
; Carbon isotopes
; Lake sediment
; Last glacial maximum (LGM)
; Monte Carlo empirical orthogonal function
; Palaeoclimatology
; Quaternary
; Scanning XRF
Scopus关键词: Climate change
; Glacial geology
; Isotopes
; Lakes
; Moisture
; Monte Carlo methods
; Oceanography
; Organic carbon
; Australasia
; Carbon isotopes
; Empirical Orthogonal Function
; Lake sediments
; Last Glacial Maximum
; Palaeoclimatology
; Quaternary
; Orthogonal functions
; atmosphere-ocean coupling
; carbon isotope
; carbon isotope ratio
; climate variation
; glacial-interglacial cycle
; global climate
; hydrological cycle
; hydrological response
; lacustrine deposit
; last deglaciation
; Last Glacial Maximum
; Monte Carlo analysis
; paleoclimate
; Quaternary
; sea surface temperature
; Southern Hemisphere
; X-ray fluorescence
; Australasia
; Australia
; Southern Ocean
英文摘要: Global climate variability during the late Quaternary is commonly investigated within the framework of the ‘bipolar seesaw’ pattern of asynchronous temperature variations in the northern and southern polar latitudes. The terrestrial hydrological response to this pattern in south-eastern Australia is not fully understood, as continuous, high-resolution, well-dated proxy records for the hydrological cycle in the region are sparse. Here we present a well-dated, highly resolved record of moisture balance spanning 30000–10000 calendar years before present (30–10 ka BP), based on x-ray fluorescence and organic carbon isotope (δ13COM) measurements of a sedimentary sequence from Lake Surprise in south-eastern Australia. The data provide a locally coherent record of the hydrological cycle. Elevated Si (reflecting windblown quartz and clays), and relatively high δ13COM indicate an extended period of relative aridity between 28 and 18.5 ka BP, interrupted by millennial-scale episodes of decreased Si and δ13COM, suggesting increased moisture balance. This was followed by a rapid deglacial shift to low Si and δ13COM at 18.5 ka BP, indicative of wetter conditions. We find that these changes are coeval with other records from south-eastern Australia and New Zealand, and use a Monte Carlo Empirical Orthogonal Function approach to extract a common trend from three high-resolution records. Our analyses suggest that drivers of the regional hydrological cycle have varied on multi-millennial time scales, in response to major shifts in global atmosphere-ocean dynamics during the last glacial-interglacial transition. Southern Ocean processes were the dominant control on hydroclimate during glacial times, via a strong influence of cold sea surface temperatures on moisture uptake and delivery onshore. Following the last deglaciation (around 18 ka BP), the southward migration of cold Southern Ocean fronts likely resulted in the establishment of conditions more like those of the present day. Millennial-scale variability in records from the region is dominated by a persistent ca. 2300-year periodicity, consistent with other records across the Southern Hemisphere mid-latitudes; however, this pervasive periodicity is not obviously linked to the ‘bipolar seesaw’ and the mechanism remains equivocal. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112150
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Sciences, University of Adelaide, North TerraceSouth Australia 5005, Australia; Sprigg Geobiology Centre, University of Adelaide, North TerraceSouth Australia 5005, Australia; Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia; Department of Geography, Environment and Population, University of Adelaide, North TerraceSouth Australia 5005, Australia; Palaeontology, Geobiology and Earth Archives Research Centre, ARC Centre of Excellence in Australian Biodiversity and Heritage, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Department of Earth & Planetary Sciences and Macquarie University Marine Research Centre, Macquarie University, North Ryde, 2109, Australia; Centre for Accelerator Science, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2232, Australia; School of Earth, Atmosphere and Environment, Monash University, Melbourne, Victoria 3800, Australia
Recommended Citation:
Falster G.,Tyler J.,Grant K.,et al. Millennial-scale variability in south-east Australian hydroclimate between 30,000 and 10,000 years ago[J]. Quaternary Science Reviews,2018-01-01,192