Climates of the last three interglacials in subtropical eastern Australia inferred from wetland sediment geochemistry

Kemp, Christopher; Tibby, John; Arnold, Lee J.; Barr, Cameron; Gadd, Patricia; Marshall, Jonathan; McGregor, Glenn B.; Jacobsen, Geraldine

doi:10.1016/j.palaeo.2019.109463

Cited by 18 publications

(42 citation statements)

References 108 publications

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“…(For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.) wetland sediments (Kemp et al, 2020;Lewis et al, 2020). Geochemical variation driven by inorganic material deposition is further supported by the separate grouping of biogenic and lithogenic element proxies and ratios (Supplementary Fig.…”

Section: μXrf Elemental Scanning and Principal Component Analysismentioning

confidence: 70%

“…These elements provided accurate estimates of detrital and biochemical input based on their positions and grouping on the PC1 axis for Brown Lake (Supplementary Fig. S1) and other sites on North Stradbroke Island (e.g., Kemp et al, 2020;Lewis et al, 2020). Element count data were normalized by inc/ coh because this was found to correlate with measured LOI values (r 2 = 0.90; p-value <0.05) (Supplementary Fig.…”

Section: Core Correlationmentioning

confidence: 99%

“…Stradbroke Island wetland localities (e.g., Kemp et al, 2020;Lewis et al, 2020). The final D e values of these five samples (BL18-A, NSI18-1, NSI18-2, NSI18-3, and NSI18-6) have therefore been calculated using the central age model (CAM) (Galbraith et al, 1999).…”

Section: Lab Codementioning

confidence: 99%

“…The disparity in ages observed between parts of the BL18 and BL09 cores highlights the need to understand basin morphology, and the importance of developing robust age models before drawing inferences from paleoenvironmental proxies. Patterns of aeolian deposition in subtropical Australia through the last glacial and deglacial periods (Grant et al, 2014) (R.S.L.=relative sea level) along with the Brown Lake, Fern Gully Lagoon (Kemp et al, 2020), and Welsby Lagoon (Lewis et al, 2020) inorganic sediment accumulation records. The pink areas represent hiatus periods experienced at these wetlands.…”

Section: Brown Lake Bl09 and Bl18 Age Modelsmentioning

confidence: 99%

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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: μXrf Elemental Scanning and Principal Component Analysismentioning

confidence: 70%

Section: Core Correlationmentioning

confidence: 99%

Section: Lab Codementioning

confidence: 99%

Section: Brown Lake Bl09 and Bl18 Age Modelsmentioning

confidence: 99%

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

et al. 2021

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“…These dynamic climate subsystems likely have expanded and contracted through time, thereby influencing the long-term climate of the Orakei area. Kidson (2000) described six regional climate zones in New Zealand from north to south, which experience very different climate parameters. Persistent mid-latitude westerly circulation brings moisture-laden air masses to much of New Zealand (Hessell, 1988), although the northern parts of the archipelago, including the Orakei area, are also seasonally influenced by the subtropical anticyclonic belt (Alloway et al, 2007;Barrell et al, 2013).…”

Section: Regional Settingmentioning

confidence: 99%

Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand

et al. 2020

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Abstract. Northern New Zealand is an important location for understanding Last Glacial Interval (LGI) palaeoclimate dynamics, since it is influenced by both tropical and polar climate systems which have varied in relative strength and timing. Sediments from the Auckland Volcanic Field maar lakes preserve records of such large-scale climatic influences on regional palaeo-environment changes, as well as past volcanic eruptions. The sediment sequence infilling Orakei maar lake is continuous, laminated, and rapidly deposited, and it provides a high-resolution (sedimentation rate above ∼ 1 m kyr−1) archive from which to investigate the dynamic nature of the northern New Zealand climate system over the LGI. Here we present the chronological framework for the Orakei maar sediment sequence. Our chronology was developed using Bayesian age modelling of combined radiocarbon ages, tephrochronology of known-age rhyolitic tephra marker layers, 40Ar∕39Ar-dated eruption age of a local basaltic volcano, luminescence dating (using post-infrared–infrared stimulated luminescence, or pIR-IRSL), and the timing of the Laschamp palaeomagnetic excursion. We have integrated our absolute chronology with tuning of the relative palaeo-intensity record of the Earth's magnetic field to a global reference curve (PISO-1500). The maar-forming phreatomagmatic eruption of the Orakei maar is now dated to > 132 305 years (95 % confidence range: 131 430 to 133 180 years). Our new chronology facilitates high-resolution palaeo-environmental reconstruction for northern New Zealand spanning the last ca. 130 000 years for the first time as most NZ records that span all or parts of the LGI are fragmentary, low-resolution, and poorly dated. Providing this chronological framework for LGI climate events inferred from the Orakei sequence is of paramount importance in the context of identification of leads and lags in different components of the Southern Hemisphere climate system as well as identification of Northern Hemisphere climate signals.

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Climate, fire and vegetation history from subtropical North Stradbroke Island (Minjerribah), eastern Australia, during the last three interglacials

Kemp

Tibby

Barr

et al. 2021

J Quaternary Science

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Records of Australian palaeoclimate beyond the last glacial cycle are rare, limiting detailed analysis of long‐term climate trends and associated ecosystem responses. This study analyses a discontinuous pollen and charcoal record from Fern Gully Lagoon, North Stradbroke Island (Minjerribah), subtropical Queensland, Australia, which covers much of the last ~210 ,000 years. Climate variation is inferred from changes in vegetation, while analysis of micro‐ and macrocharcoal is used to infer fire activity. Pollen assemblages consist of ~40% rainforest taxa during marine isotope stage (MIS) 7a–c and early MIS 5. These are inferred to result from high rainfall in the Australian subtropics, which was also evident in north‐east and central Australia. Human impact from 21 ,000 years ago likely supressed post‐MIS 2 rainforest expansion to some extent. However, the increased Holocene abundance of herbs and grasses and reduced representation of aquatic taxa suggest that the Holocene was relatively dry when compared with early MIS 5 and MIS 7a–c. Similar MIS 5 and early MIS 7a–c climates, in contrast to a notably drier Holocene, suggest that the progressive interglacial drying trend most strongly recorded in central Australia was not a major feature of subtropical eastern Australian climates.

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Climates of the last three interglacials in subtropical eastern Australia inferred from wetland sediment geochemistry

Cited by 18 publications

References 108 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

Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand

Climate, fire and vegetation history from subtropical North Stradbroke Island (Minjerribah), eastern Australia, during the last three interglacials

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