ORCID Profile
0000-0003-2614-7177
Current Organisation
UNSW Sydney
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Physical Geography and Environmental Geoscience | Geochronology | Palaeoclimatology | Palaeoecology | Quaternary Environments | Geology | Geomorphology | Glaciology | Geomorphology and Regolith and Landscape Evolution | Glaciology | Climatology (Incl. Palaeoclimatology)
Climate change | Ecosystem Adaptation to Climate Change | Effects of Climate Change and Variability on Australia (excl. Social Impacts) | Climate Variability (excl. Social Impacts) | Climate Change Models | Earth sciences |
Publisher: Hindawi Limited
Date: 26-07-2021
DOI: 10.1002/HUMU.24251
Publisher: Wiley
Date: 2013
Publisher: Elsevier
Date: 2011
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 08-2013
Publisher: Elsevier BV
Date: 08-2006
Publisher: Geological Society of London
Date: 2010
DOI: 10.1144/SP346.10
Publisher: Elsevier BV
Date: 06-2007
Publisher: Elsevier BV
Date: 06-2007
Publisher: Elsevier BV
Date: 04-2010
Publisher: Elsevier BV
Date: 08-2013
Publisher: Cambridge University Press (CUP)
Date: 28-12-2022
DOI: 10.1017/QUA.2021.72
Abstract: Only a small area of the Australian mainland was glaciated during the Pleistocene, whereas periglacial deposits are far more common, indicating that cold environments were extensive and a major influence on landscape evolution. Here we identify representative low-elevation ex les of scree slopes and frost action, together with fans and valley fills, indicating pronounced erosion cycles during the Pleistocene. To date the deposits, we explore approaches using radiocarbon, optically stimulated luminescence, and profile dating using the cosmogenic nuclide 10 Be. The radiocarbon and optical ages show that screes, alluvial valley fill, and fans were deposited between 66–13 ka during the coldest part of the last glacial cycle, and within the previous glacial cycle. Exposure dating indicates further landscape erosion cycles back to the mid Pleistocene. Together, the deposits indicate the frost cracking limit was ~1300 m lower at 680 ± 10 m and mean winter temperature was 8.2 ± 0.5°C colder than present. Periglacial conditions probably affected much of southeastern Australia. The treeless and dry conditions resulted in widespread erosion and increased run off. Combined with increased snow storage within catchments, rivers were paradoxically larger, with high seasonal discharge and sediment loads.
Publisher: Elsevier BV
Date: 2018
Publisher: Wiley
Date: 2006
DOI: 10.1002/JQS.1073
Publisher: Elsevier BV
Date: 2002
Publisher: American Geophysical Union (AGU)
Date: 02-08-2013
DOI: 10.1002/PALO.20035
Publisher: SAGE Publications
Date: 23-08-2018
Abstract: Relict landforms provide a wealth of information on the evolution of the modern landscape and climate change in the past. To improve understanding of the origin and development of these landforms we need better spatial measurements across a variety of scales. This can be challenging using conventional surveying techniques due to difficulties in landform recognition on the ground (e.g. weak visual/topographic expression) and spatially variable areas of interest. Here we explore the appropriateness of existing remote sensing datasets (aerial LiDAR and aerial photography) and newly acquired unmanned aerial vehicle (UAV) imagery of a test site on the upland of Dartmoor in SW England (Leeden Tor) for the recognition and automated mapping of relict patterned ground composed of stripes and polygons. We find that the recognition of these landforms is greatly enhanced by automated mapping using spectral two-dimensional imagery. Image resolution is important, with the recognition of elements (boulders) of m maximised from the highest resolution imagery (UAV red-green-blue (RGB)) and recognition of landforms (10–100 m scale) maximised on coarser resolution aerial imagery. Topographic metrics of these low relief (0.5 m) landforms are best extracted from structure-from-motion (SfM) processed UAV true-colour imagery, and in this context the airborne LiDAR data proved less effective. Integrating automated mapping using spectral attributes and SfM-derived digital surface models from UAV RGB imagery provides a powerful tool for rapid reconnaissance of field sites to facilitate the extraction of meaningful topographic and spatial metrics that can inform on the origin of relict landform features. Care should be given to match the scale of features under consideration to the appropriate scale of datasets available.
Publisher: Elsevier BV
Date: 12-2014
Publisher: American Geophysical Union (AGU)
Date: 24-05-2007
DOI: 10.1029/2006PA001328
Publisher: Wiley
Date: 20-03-2013
DOI: 10.1002/ESP.3402
Publisher: Elsevier BV
Date: 06-2020
Publisher: Schweizerbart
Date: 09-2011
Publisher: Elsevier BV
Date: 04-2005
Publisher: Cambridge University Press (CUP)
Date: 03-2001
Abstract: Late Pleistocene glaciation of the Australian mainland was restricted to a small area of the southeastern highlands. Geomorphic mapping of the area and exposure dating using the in situ produced cosmogenic isotope 10 Be provides evidence for at least two distinct glaciations. The Early Kosciuszko glaciation consisted of a single glacier advance before 59,300 ± 5400 years ago (Snowy River Advance). The Late Kosciuszko glaciation comprised three glacier advances 32,000 ± 2500 (Headley Tarn Advance), 19,100 ± 1600 (Blue Lake Advance), and 16,800 ± 1400 years ago (Mt. Twynam Advance). The Early Kosciuszko glaciation was the most extensive and the Late Kosciuszko advances were progressively less extensive. These periods of glaciation in the highlands correspond to episodes of periglacial activity and peaks in lake levels and river discharge at lower elevations in southeastern Australia. Glacier advances on the Kosciuszko Massif correlate with advances in Tasmania, South America, and New Zealand and are broadly representative of hemispheric climate changes during the last glacial cycle.
Publisher: Elsevier BV
Date: 09-2011
Publisher: Elsevier
Date: 2011
Publisher: Elsevier BV
Date: 03-1999
Publisher: Informa UK Limited
Date: 15-10-2019
Publisher: Cambridge University Press (CUP)
Date: 1999
DOI: 10.1017/S0033822200019482
Abstract: We present results that validate a new wet oxidation, stepped-combustion procedure for dating “old” charcoal s les. An acid–base–wet oxidation (ABOX) pretreatment procedure has been developed that is used in place of the conventional acid-base-acid (ABA) pretreatment. Combustions and graphitizations are performed in a vacuum line that is insulated from the atmosphere by a second backing vacuum to eliminate the risk of atmospheric leakage into the line at any stage of the procedure. Combustions are performed at 3 temperatures (330 °, 630 ° and 850 °) with a graphite target produced from the CO 2 evolved during each combustion step. In this way, the removal of any contamination can be monitored, and a high degree of confidence can be placed on the final age. The pretreatment, combustion, graphitization, and measurement blank for the procedure, based on the analysis of a “radiocarbon-dead” graphite, is 0.5 ± 0.5 μg C (1σ, n=14), equivalent to 0.04 ± 0.02 pMC or an “age” of approximately 60 ka for a 1 mg graphite target. Analyses of a “radiocarbon-dead” natural charcoal after ABOX pretreatment and stepped combustion suggest that the total blank (including contamination not removed by pretreatment) may be higher than for graphite, ranging up to 0.10 ± 0.02 pMC. Additional experiments confirm good agreement with accepted values for the international low- 14 C “New Kauri” standard (0.16–0.25 pMC). They also confirm excellent reproducibility, with 3 separate dates on different aliquots of a charcoal s le from Ngarrabullgan Cave (Queensland, Australia) ranging from 35.2 to 35.5 ka 14 C BP. It is also demonstrated that the ABOX pretreatment, in conjunction with the new vacuum line described here, is able to remove contamination not removed by the conventional ABA pretreatment, suggesting that the technique can be used to produce reliable 14 C dates on charcoal up to at least 50 ka.
Publisher: Elsevier BV
Date: 12-2015
Publisher: Elsevier BV
Date: 09-2007
Publisher: Elsevier BV
Date: 08-2013
Publisher: American Association for the Advancement of Science (AAAS)
Date: 09-05-2008
Abstract: Applegate et al . present the results of a moraine degradation model and suggest that the age of the Waiho Loop may be 1000 years older than the age we presented, thus raising the possibility that the moraine is a Younger Dryas landform. We show that this assessment is misleading on a number of grounds.
Publisher: Elsevier BV
Date: 05-2010
Publisher: Elsevier BV
Date: 08-2022
Publisher: SAGE Publications
Date: 29-03-2010
Abstract: Lake George is one of the largest freshwater lakes in Australia when full, and provides one of the most complete records of Quaternary sedimentation in the southeastern part of the continent. The lake is currently ephemeral, but sediments within the basin preserve evidence of multiple permanent and dry lake conditions in the past. We present an optically stimulated luminescence (OSL) chronology of recent lake shoreline sediments in order to reconstruct Holocene hydrologic variability at Lake George, providing past climatic context for the presently ephemeral lake conditions. The OSL chronology indicates three distinct periods of permanent lake conditions up to 15—18 m depth over the Holocene period, at approximately 10—8, 6—2.4 and 0.7—0.3 ka, with lower lake levels occurring in between those events. There appears to be a trend towards lake regression over this period despite relatively recent high lake levels. The chronology is broadly synchronous with comparable records of Holocene climatic variability across southeastern Australia. We also investigate the intrinsic luminescence characteristics of different sediment types as diagnostic tools, but these appear not to be appropriate in this context or form.
Publisher: Elsevier BV
Date: 05-2006
Publisher: Cambridge University Press (CUP)
Date: 04-2020
DOI: 10.1017/AOG.2020.35
Abstract: Airborne radio-echo sounding (RES) surveys are widely used to measure ice-sheet bed topography. Measuring bed topography as accurately and widely as possible is of critical importance to modelling ice dynamics and hence to constraining better future ice response to climate change. Measurement accuracy of RES surveys is influenced both by the geometry of bed topography and the survey design. Here we develop a novel approach for simulating RES surveys over glaciated terrain, to quantify the sensitivity of derived bed elevation to topographic geometry. Furthermore, we investigate how measurement errors influence the quantification of glacial valley geometry. We find a negative bias across RES measurements, where off-nadir return measurement error is typically −1.8 ± 11.6 m. Topographic highlands are under-measured an order of magnitude more than lowlands. Consequently, valley depth and cross-sectional area are largely under-estimated. While overall estimates of ice thickness are likely too high, we find large glacier valley cross-sectional area to be under-estimated by −2.8 ± 18.1%. Therefore, estimates of ice flux through large outlet glaciers are likely too low when this effect is not taken into account. Additionally, bed mismeasurements potentially impact our appreciation of outlet-glacier stability.
Publisher: Informa UK Limited
Date: 1997
Publisher: The Royal Society
Date: 06-2022
DOI: 10.1098/RSOS.220312
Abstract: Glaciation during the late Middle Pleistocene is widely recognized across continental northwest Europe, but its extent and palaeoenvironmental significance in the British Isles are disputed. Although glaciogenic sediments at Wolston, Warwickshire, in the English West Midlands, have been used to define the stratotype of the Wolstonian Stage, their age has been variably assigned between marine isotope stages (MIS) 12 and 6. Here we present sedimentological and stratigraphical observations from five sites across the English West Midlands whose chronology is constrained by new luminescence ages from glaciofluvial sediments, supplemented by cosmogenic 36 Cl exposure dating of erratic boulders. The ages suggest that between 199 ± 5 and 147 ± 2.5 ka the British Ice Sheet advanced into the English West Midlands as far south as Moreton-in-Marsh, Gloucestershire. This advance is assigned to the Moreton Stadial of the Late Wolstonian Substage. Dating of the glaciation to this substage allows correlation of the Moreton Stadial glacial deposits in the English West Midlands with those of the Drenthe Stadial during the Late Saalian Substage across continental northwest Europe.
Publisher: Springer Science and Business Media LLC
Date: 18-01-2009
DOI: 10.1038/NGEO411
Publisher: Elsevier BV
Date: 09-1998
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-10-2007
Abstract: As the climate warmed at the end of the last glacial period, a rapid reversal in temperature, the Younger Dryas (YD) event, briefly returned much of the North Atlantic region to near full-glacial conditions. The event was associated with climate reversals in many other areas of the Northern Hemisphere and also with warming over and near Antarctica. However, the expression of the YD in the mid- to low latitudes of the Southern Hemisphere (and the southwest Pacific region in particular) is much more controversial. Here we show that the Waiho Loop advance of the Franz Josef Glacier in New Zealand was not a YD event, as previously thought, and that the adjacent ocean warmed throughout the YD.
Publisher: Wiley
Date: 2006
DOI: 10.1002/JQS.989
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 06-2007
Publisher: Wiley
Date: 28-05-2012
DOI: 10.1002/ESP.3260
Publisher: Elsevier BV
Date: 02-2011
Publisher: Cambridge University Press (CUP)
Date: 12-05-2021
DOI: 10.1017/QUA.2021.16
Abstract: The timing and duration of the coldest period in the last glacial stage, often referred to as the last glacial maximum (LGM), has been observed to vary spatially and temporally. In Australia, this period is characterised by colder, and in some places more arid, climates than today. We applied Monte-Carlo change point analysis to all available continuous proxy records covering this period, primarily pollen records, from across Australia (n = 37) to assess this change. We find a significant change point occurred (within uncertainty) at 28.6 ± 2.8 ka in 25 records. We interpret this change as a shift to cooler climates, associated with a widespread decline in biological productivity. An additional change point occurred at 17.7 ± 2.2 ka in 24 records. We interpret this change as a shift towards warmer climates, associated with increased biological productivity. We broadly characterise the period between 28.6 (± 2.8) – 17.7 (± 2.2) ka as an extended period of maximum cooling, with low productivity vegetation that may have occurred as a combined response to reduced temperatures, lower moisture availability and atmospheric CO 2 . These results have implications for how the spatial and temporal coherence of climate change, in this case during the LGM, can be best interrogated and interpreted.
Publisher: Elsevier BV
Date: 08-2013
Publisher: Elsevier BV
Date: 04-2005
Publisher: Schweizerbart
Date: 06-2012
Publisher: Informa UK Limited
Date: 1990
DOI: 10.3109/00365529009095526
Abstract: Simultaneous recordings of pressure and slow-wave activity were obtained from the sphincter of Oddi (SO) and the duodenum in anesthetized rabbits. Histographic analysis of the recordings was performed when the following criteria were fulfilled: 1) slow waves must be present in the EMG recordings from both compartments and 2) only pressure recordings with sufficient pressure activity (greater than 50 peaks in 10 min) would be considered. Of 12 animals fulfilling the criteria for histographic analysis of 4 channels, a common basic-mode activity was found in all channels in 9 animals (75%). Of three animals fulfilling the criteria for histographic analysis of three channels, a common basic-mode activity was seen in all channels in all animals (100%). A correlation between the litude of the slow waves and the litude of the elicited pressure peaks in the SO was significant at a 5% level or better in 12 animals (80%). In some of the animals episodes of low- litude pressure activity was observed in the SO, occurring synchronously with slow waves devoid of spike activity. It is concluded that rabbit SO and duodenum are paced by slow waves with a common basic-mode activity in most animals. Slow waves may not only be the chief determinant of the contractile rhythm but may also have a certain influence on the force of the in idual SO contractions. It is suggested that slow waves per se may be able to mediate contractile activity.
Publisher: Elsevier BV
Date: 10-2007
Publisher: Wiley
Date: 2007
DOI: 10.1002/ESP.1415
Publisher: Springer Science and Business Media LLC
Date: 04-08-2017
Publisher: Elsevier BV
Date: 03-2004
Publisher: Springer International Publishing
Date: 2014
Publisher: Geological Society of America
Date: 2006
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer Science and Business Media LLC
Date: 15-09-2020
DOI: 10.1038/S41467-020-18327-6
Abstract: A hallmark of neurodegeneration is defective protein quality control. The E3 ligase Listerin (LTN1/Ltn1) acts in a specialized protein quality control pathway—Ribosome-associated Quality Control (RQC)—by mediating proteolytic targeting of incomplete polypeptides produced by ribosome stalling, and Ltn1 mutation leads to neurodegeneration in mice. Whether neurodegeneration results from defective RQC and whether defective RQC contributes to human disease have remained unknown. Here we show that three independently-generated mouse models with mutations in a different component of the RQC complex, NEMF/Rqc2, develop progressive motor neuron degeneration. Equivalent mutations in yeast Rqc2 selectively interfere with its ability to modify aberrant translation products with C-terminal tails which assist with RQC-mediated protein degradation, suggesting a pathomechanism. Finally, we identify NEMF mutations expected to interfere with function in patients from seven families presenting juvenile neuromuscular disease. These uncover NEMF’s role in translational homeostasis in the nervous system and implicate RQC dysfunction in causing neurodegeneration.
Publisher: Geological Society of America
Date: 02-2014
DOI: 10.1130/G35238.1
Publisher: Elsevier BV
Date: 11-2009
Publisher: Elsevier BV
Date: 08-2013
Publisher: American Geophysical Union (AGU)
Date: 14-05-2003
DOI: 10.1029/2002PA000877
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 08-2013
Publisher: American Geophysical Union (AGU)
Date: 02-2000
DOI: 10.1029/1999PA900047
Publisher: Elsevier BV
Date: 12-2020
Publisher: Springer Science and Business Media LLC
Date: 27-09-2017
Publisher: American Chemical Society (ACS)
Date: 15-03-2021
Publisher: American Geophysical Union (AGU)
Date: 10-2019
DOI: 10.1029/2019PA003632
Publisher: Cambridge University Press (CUP)
Date: 23-08-2023
DOI: 10.1017/QUA.2022.32
Abstract: Pleistocene periglacial activity in eastern Australia was widespread and has been predicted to have extended along much of the east coast. This paper describes block deposits in the New England Tablelands, Australia, as far north as 30°S. These deposits are characterized by openwork blocks on slopes below the angle of repose. The deposits are positioned where frost cracking was significant and range in area up to 8 ha. Surface exposure dating using the cosmogenic nuclide 36 Cl from four block deposits indicate all sites were active late during the last glacial cycle, with a concentration of activity between 15–30 ka. Modern temperature measurements from block deposits highlight the importance of local topography for promoting freezing. Periglacial deposits are likely to have been more extensive than previously recognized at these northern limits, and mean annual temperature more than 8°C colder than today.
Publisher: Elsevier BV
Date: 11-2005
Publisher: Wiley
Date: 04-10-2018
DOI: 10.1002/ESP.4483
Publisher: Elsevier BV
Date: 08-2008
Publisher: Springer Science and Business Media LLC
Date: 09-06-2017
Publisher: Wiley
Date: 09-2019
DOI: 10.1111/MAPS.13378
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2011
End Date: 06-2015
Amount: $360,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2005
End Date: 12-2008
Amount: $290,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2018
End Date: 02-2024
Amount: $900,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2010
End Date: 12-2012
Amount: $160,000.00
Funder: Australian Research Council
View Funded Activity