Evidence for a change in wind regime during the Last Glacial Maximum from the Sydney region

被引:7
作者
Thom, B. G. [1 ,2 ]
Oliver, T. S. N. [2 ,3 ]
机构
[1] Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia
[2] Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW 2500, Australia
[3] Univ New South Wales, Australian Def Force Acad, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia
关键词
Cliff-top dunes; podzolised sands; sand transport; wind circulation patterns; glacial low stand; past sea-level; NEW-SOUTH-WALES; COASTAL DUNES; LATE PLEISTOCENE; EASTERN AUSTRALIA; CLIMATE-CHANGE; LUMINESCENCE; QUEENSLAND; SAND; COOLOOLA; NORTHERN;
D O I
10.1080/08120099.2019.1522668
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
This paper presents the results of a small number of dates from sand samples collected at building sites in the eastern suburbs of Sydney. OSL ages of well-sorted, quartz sand ranges from 31 to 24 ka from within well-developed podzol soil profiles within a metre of the surface. The source of this sand appears to be from the east off the inner continental shelf during a period just prior to the maximum of the Last Glacial Maximum (LGM, Marine Isotope Stage 2) when sea-level was approximately 70-90 m below present level. During a later phase of the LGM, there is evidence from other coastal sites in central NSW and Gippsland, Victoria, that the dominant wind was from the west consistent with evidence from arid and semiarid Australia. Dune orientations in northern NSW into Queensland and other evidence at this time appear to reflect winds from the southeast quadrant. This study highlights the existence of a potential pivot area in dominant wind direction during the LGM between sustained westerly flow in southern area including Victoria and northeast Tasmania and southeast flow of northern NSW into Queensland. In central NSW, the circulation switched from easterly in Stage 2 to westerly as the glacial stage intensified in the LGM sometime after ca 25 ka.
引用
收藏
页码:279 / 288
页数:10
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