干旱区生态环境知识资源中心(Arid): Climatic evolution in the Australian region over the last 94 ka - spanning human occupancy -, and unveiling the Last Glacial Maximum

Arid

DOI	10.1016/j.quascirev.2020.106593
	Climatic evolution in the Australian region over the last 94 ka - spanning human occupancy -, and unveiling the Last Glacial Maximum
	De Deckker, P.; Moros, M.; Perner, K.; Blanz, T.; Wacker, L.; Schneider, R.; Barrows, T. T.; O'Loingsigh, T.; Jansen, E.
通讯作者	De Deckker, P
来源期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
出版年	2020
卷号	249
英文摘要	The Quaternary is well known for being a period of the geological record that saw significant and alternating climatic fluctuations. Here, we concentrate on the last 94 millennia that saw Australia and its surrounding seas undergo significant environmental changes. Importantly also it is during that this period of time includes the arrival and settlement of humans in Australia. Following on from Marine Isotopic Stage 4 (MIS4) that saw, over the period of 71-59 ka BP, a significant eustatic sea level drop (similar to 100 m), low sea-surface temperatures as well as glacial conditions on land, Australia experienced wet conditions again, but eventually progressively entered into a glacial phase. By then, humans had arrived on this large continent and later the megafauna progressively became extinct. This paper describes in detail the climate over this period, based principally on the high-resolution record of two marine sediment cores located offshore of the southern Australian margin, and that are then compared with known events on land as well as other deep-sea cores. Particular emphasis is placed on the period that spans the Last Glacial Maximum (LGM), the extent of which thus far had been poorly defined in the Australian region. Emphasis is placed on the period from 34 to 14 ka to demonstrate that (1) the LGM, defined here as the period 24 to 18 ka, was not always extremely dry and cold, and (2) that people were able to live in inland Australia as water existed in places, despite generally cold conditions. We also show using a series of ten maps-at 2 ka intervals over the 34-14 ka period-the waxing and waning of oceanic fronts such as the Subtropical and Subantarctic Fronts, link sea-surface temperatures (SST) with periods of glacial expansion in the Australian Alps and Tasmania, as well as the South Island of New Zealand, and the extent of the Leeuwin Current down to south of Australia. Aeolian dust was transported at sea over the main core site from similar to 26 to 18 ka period, pointing to arid conditions in Australia, but this period was punctuated by two significant reductions in dust transport to both core sites, coinciding with a retreat of the Subantarctic Front away from the Australian southern coastline, and slight SST shifts for a few centuries at similar to 24 and 22-21 ka BP. At the peak of the cold phase, from 23 to 18.4 ka, summer SST were of the order of 9 degrees C below that experienced during the middle of the Holocene at about 6 ka BP. A similar temperature drop was also experienced offshore the northwestern corner of Western Australia. Periglacial activity dates for the Australian mainland and Tasmania pool around similar to 22 ka. On either side of the 24 ka event, the chain of lakes in the Willandra Lakes retained water and human activity was registered in the area. Elsewhere in Australia, water was present to sustain human populations during the cold and dry times. It is postulated here that northern Australia was at times quite wet, especially during MIS4. The cessation of the LGM is set on 18.4 ka from offshore southern Australia as confirmed for the deepsea cores by several proxies, and more likely at 18 ka inland. Finally, we document that it took two millennia for glacial conditions to end in the Australian region as registered in our deep-sea core records, well after the lowest global sea level similar to 20.6 and 20 ka, respectively, started to rise. There is also evidence of another very cold period determined on the Australian mainland, Tasmania and the South Island of New Zealand centred around 27 ka, after which time warmer conditions occurred before the start of the LGM. This is matched with our deep-sea records with very cold conditions and changes in oceanographic conditions. (C) 2020 Elsevier Ltd. All rights reserved.
英文关键词	Oceanic fronts Leeuwin Current Foraminifer faunal analysis Marine isotopic stages Last Glacial Maximum Palaeoceanography Sea-surface temperature Moraines Modern analogue technique Subantarctic Front G. ruber
类型	Review
语种	英语
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000589910600006
WOS关键词	SEA-SURFACE TEMPERATURE ; PAST 100 KA ; LATE PLEISTOCENE ; SOUTHERN ALPS ; NEW-ZEALAND ; HUMAN OCCUPATION ; ATMOSPHERIC CO2 ; INDIAN-OCEAN ; TASMAN SEA ; PALEOENVIRONMENTAL CHANGE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327535
作者单位	[De Deckker, P.] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia; [Moros, M.; Perner, K.] Leibniz Inst Balt Sea Res, Seestr 15, D-18119 Rostock, Germany; [Blanz, T.] Univ Kiel, Inst Geosci, Ludwig Meyn Str 10, D-24118 Kiel, Germany; [Wacker, L.; Schneider, R.] ETH, Lab Ion Beam Phys LIP, Otto Stern Weg 5, CH-8093 Zurich, Switzerland; [Barrows, T. T.] Univ Wollongong, Sch Earth Atmospher & Life Sci, Wollongong, NSW 2500, Australia; [Barrows, T. T.] Univ Portsmouth, Sch Environm Geog & Geosci, Portsmouth, Hants, England; [O'Loingsigh, T.] Griffith Univ, Sch Environm & Sci, Nathan, Qld 4111, Australia; [Jansen, E.] Univ Bergen, Dept Earth Sci, Jahnebakken 5, N-5020 Bergen, Norway; [Jansen, E.] Univ Bergen, Bjerknes Ctr Climate Res, Jahnebakken 5, N-5020 Bergen, Norway; [Jansen, E.] NORCE Norwegian Res Ctr Climate, Jahnebakken 5, N-5020 Bergen, Norway; [Jansen, E.] Bjerknes Ctr Climate Res, Jahnebakken 5, N-5020 Bergen, Norway
推荐引用方式 GB/T 7714	De Deckker, P.,Moros, M.,Perner, K.,et al. Climatic evolution in the Australian region over the last 94 ka - spanning human occupancy -, and unveiling the Last Glacial Maximum[J],2020,249.
APA	De Deckker, P..,Moros, M..,Perner, K..,Blanz, T..,Wacker, L..,...&Jansen, E..(2020).Climatic evolution in the Australian region over the last 94 ka - spanning human occupancy -, and unveiling the Last Glacial Maximum.QUATERNARY SCIENCE REVIEWS,249.
MLA	De Deckker, P.,et al."Climatic evolution in the Australian region over the last 94 ka - spanning human occupancy -, and unveiling the Last Glacial Maximum".QUATERNARY SCIENCE REVIEWS 249(2020).