Geochemical changes recorded in Lynch's Crater, Northeastern Australia, over the past 50 ka

Turney, Chris S. M.; Kershaw, A. Peter; James, Sarah; Branch, Nick; Cowley, Joan; Fifield, L.K.; Jacobsen, Geraldine; Moss, Patrick

doi:10.1016/j.palaeo.2005.09.009

Cited by 20 publications

(10 citation statements)

References 35 publications

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“…9) and may be a product of different conditions between each catchment, or their respective age models. Nevertheless, the mechanism influencing precipitation across the catchments is likely regional, possibly linked to the Antarctic Cold Reversal (Barr et al, 2017), or ENSO because geographically separate climate records across the Australian continent also indicate a change towards more positive moisture balance during the deglacial phase (Turney et al, 2006b; Williams et al, 2009; Petherick et al, 2013).…”

Section: Discusssionmentioning

confidence: 99%

Patterns of aeolian deposition in subtropical Australia through the last glacial and deglacial periods

et al. 2021

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Debate about the nature of climate and the magnitude of ecological change across Australia during the last glacial maximum (LGM; 26.5–19 ka) persists despite considerable research into the late Pleistocene. This is partly due to a lack of detailed paleoenvironmental records and reliable chronological frameworks. Geochemical and geochronological analyses of a 60 ka sedimentary record from Brown Lake, subtropical Queensland, are presented and considered in the context of climate-controlled environmental change. Optically stimulated luminescence dating of dune crests adjacent to prominent wetlands across North Stradbroke Island (Minjerribah) returned a mean age of 119.9 ± 10.6 ka; indicating relative dune stability soon after formation in Marine Isotope Stage 5. Synthesis of wetland sediment geochemistry across the island was used to identify dust accumulation and applied as an aridification proxy over the last glacial-interglacial cycle. A positive trend of dust deposition from ca. 50 ka was found with highest influx occurring leading into the LGM. Complexities of comparing sedimentary records and the need for robust age models are highlighted with local variation influencing the accumulation of exogenic material. An inter-site comparison suggests enhanced moisture stress regionally during the last glaciation and throughout the LGM, returning to a more positive moisture balance ca. 8 ka.

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Section: Discusssionmentioning

confidence: 99%

Patterns of aeolian deposition in subtropical Australia through the last glacial and deglacial periods

et al. 2021

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“…The LGM globally is considered to have occurred between 27 and 19 ka (Clark et al, 2009). For Australia the timing of the LGM was defined to have started later; it centred on~21 ka (Suggate, 1990) and lasted 3-4 ka (Bowler, 1976;Harrison, 1993;Barrows et al, 2001), or occurred from 23 to 18 cal ka BP (Kershaw, 1986;D'Costa et al, 1989;Turney et al, 2006) and was characterized by limited glacial advances in the Snowy Mountains and Tasmanian Highlands. Both of these regions recorded a maximum glacier extent at~19 ka.…”

Section: -18 Ka Last Glacial Maximummentioning

confidence: 99%

Glacial and Holocene terrestrial temperature variability in subtropical east Australia as inferred from branched GDGT distributions in a sediment core from Lake McKenzie

et al. 2014

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Branched glycerol dialkyl glycerol tetraether (GDGT) distributions observed in a sediment core from Lake McKenzie were utilized to quantitatively reconstruct the pattern of mean annual air temperature (MAAT) from coastal subtropical eastern Australia between 37 and 18.3 cal ka BP and 14.0 cal ka BP to present. Both the reconstructed trend and amplitude of MAAT changes from the top of the sediment core were nearly identical to a local instrumental MAAT record from Fraser Island, providing confidence that in this sediment core branched GDGTs could be used to produce a quantitative record of past MAAT. The reconstructed trend of MAAT during 37 to 18.3 cal ka BP and timing of the Last Glacial Maximum (LGM) in the Lake McKenzie record were in agreement with previously published nearby marine climate records. The amplitude of lower-than-present MAAT during the LGM potentially provides information on the latitude of separation of the Tasman Front from the East Australian current in the subtropical western Pacific. The Lake McKenzie record shows an earlier onset of near modern day warm temperatures in the early Holocene compared to marine records and the presence of a warmer than present day period during the mid-Holocene.

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“…The disparity between palaeo-records on both regional and hemispheric scales highlights the need for further high resolution terrestrial palaeoenvironmental records for the Southern Hemisphere, particularly for periods of major and rapid change such as the LGM. With specific reference to eastern Australia, the Atherton Tablelands (tropical northern Queensland: Kershaw, 1976Kershaw, , 1994Haberle, 2005;Turney et al, 2006), Ulungra Springs (New South Wales: Dodson and Wright, 1989), Redhead Lagoon (eastern New South Wales: Williams et al, 2006) and Barrington Tops (New South Wales: Dodson et al, 1986;Sweller and Martin, 2001) have provided long records of palaeoenvironmental variability. However, there are few comparable records geographically between these sites, with records from subtropical Australia being rare.…”

Section: Introductionmentioning

confidence: 99%

Climate variability during the Last Glacial Maximum in eastern Australia: evidence of two stadials?

Petherick

McGowan

Moss

2008

J Quaternary Science

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A high-resolution, multiproxy record encompassing the last glacial-interglacial transition is presented for Native Companion Lagoon, a coastal site in subtropical eastern Australia. Rates of aeolian sedimentation in the lake were established by trace element analyses of lacustrine sediments and used as a proxy for aridity. In conjunction with sediment moisture content, charcoal and pollen these provide a multi-decadal record of palaeoenvironmental variability for the period 33-18 k cal. yr BP. Results indicate that the Last Glacial Maximum in eastern Australia spanned almost 10 k cal. yr, and was characterised by two distinct cold dry events at approximately 30.8 k cal. yr BP and 21.7 k cal. yr BP. Provenance of selected sediment samples by trace element geochemical fingerprinting shows that continental sourced aeolian sediments originated primarily from South Australia during these cold events and from sites in central Australia during the intervening time. Used in combination with a pollen record, the provenance of long-travelled dust to mainland sites shows that the two cold events were characterised by frequent meridional dry southwesterly winds rather than zonal westerly airflow as previously believed. The intervening period was cool and humid, which we infer as being associated with more frequent southeasterly winds of maritime origin. These results lend support to previous research that indicates the Southern Hemisphere experienced a period of widespread climatic amelioration at the height of the last glacial known as the Antarctic Isotopic Maximum.

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Geochemical changes recorded in Lynch's Crater, Northeastern Australia, over the past 50 ka

Cited by 20 publications

References 35 publications

Patterns of aeolian deposition in subtropical Australia through the last glacial and deglacial periods

Patterns of aeolian deposition in subtropical Australia through the last glacial and deglacial periods

Glacial and Holocene terrestrial temperature variability in subtropical east Australia as inferred from branched GDGT distributions in a sediment core from Lake McKenzie

Climate variability during the Last Glacial Maximum in eastern Australia: evidence of two stadials?

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