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Source - receptor analysis of lignin and lipid macromolecules in karst to quantify stalagmite biomarker proxies of vegetation and temperature change. Cave stalagmites are archives of past climate and environmental changes. This project seeks to develop two novel biomarkers, lignin and bacterial membrane lipids, from which we will generate new records of historic and prehistoric vegetation and temperature change.
To what extent does fire affect karst processes? Burning questions for fire management. Fire management is of crucial importance for both asset protection and ecosystem management. However, the effects of fire in karst systems is poorly understood. This project will undertake experiments to determine the effects of fire on surface and subsurface processes, including stalagmite formation, that can be used to improve fire management policy.
Understanding interglacial diversity. This project intends to improve our understanding of interglacial processes. Interglacials, the relatively brief warm intervals of Quaternary ice-age cycles, have varied significantly over the last 800 000 years in terms of their duration, timing, intensity and complexity. The reason for such diversity has eluded palaeoclimatologists for decades. This is because of the difficulty of dating marine and ice records, which best preserve interglacial histories. T ....Understanding interglacial diversity. This project intends to improve our understanding of interglacial processes. Interglacials, the relatively brief warm intervals of Quaternary ice-age cycles, have varied significantly over the last 800 000 years in terms of their duration, timing, intensity and complexity. The reason for such diversity has eluded palaeoclimatologists for decades. This is because of the difficulty of dating marine and ice records, which best preserve interglacial histories. The projects plans to compile precisely dated time series of past interglacials that can be linked directly to these records, allowing robust comparisons between interglacial properties and changes in Earth's astronomical parameters. This would advance palaeoclimate theory and provide a new perspective on the future evolution of the climate system.Read moreRead less
Millennial climate change in southern Australia during the Last Glacial. Abrupt warming and cooling events were a persistent feature of Earth's most recent climate cycle. Surprisingly, little is known of how these events affected the climate of Australia. This project will produce precisely dated reconstructions of rainfall and temperature trends in southern Australia during these events. These new terrestrial and ocean data will be compared with model simulations to determine how rapidly abrupt ....Millennial climate change in southern Australia during the Last Glacial. Abrupt warming and cooling events were a persistent feature of Earth's most recent climate cycle. Surprisingly, little is known of how these events affected the climate of Australia. This project will produce precisely dated reconstructions of rainfall and temperature trends in southern Australia during these events. These new terrestrial and ocean data will be compared with model simulations to determine how rapidly abrupt climate perturbations in the Northern Hemisphere reached our region, and the processes by which this occurred. The results will advance theory on how abrupt climate change propagates globally and provide a long-awaited climatic context for capstone events in Australia's natural history.Read moreRead less
New insights on the forcing of Quaternary ice-age terminations. This project investigates the period when Earth's climate last experienced a major step change. Using novel techniques, it combines information from an exceptional archive of cave deposits and ocean sediments to precisely determine the timing of ice-age cycles. The results will provide the first robust test of hypotheses proposed to explain these cycles, leading to refinements in the astronomical theory of the ice ages. They will al ....New insights on the forcing of Quaternary ice-age terminations. This project investigates the period when Earth's climate last experienced a major step change. Using novel techniques, it combines information from an exceptional archive of cave deposits and ocean sediments to precisely determine the timing of ice-age cycles. The results will provide the first robust test of hypotheses proposed to explain these cycles, leading to refinements in the astronomical theory of the ice ages. They will also provide an essential reference record of Northern Hemisphere ice-sheet history, which will complement data from forthcoming Antarctic ice cores. Together, this will better contextualise current and projected greenhouse warming.Read moreRead less
Landscape evolution, environmental change and human occupation history of Lake George - an outstanding natural archive. This project will study the environmental and human history of Lake George, where sand and gravel are mined to supply the Canberra region's construction industry. The project will investigate past vegetation and climate changes, lake level fluctuations, groundwater flow, sediment deposition, archaeology and sustainable resource management outcomes.
From ancient to modern environments in southeastern Australia: evidence from the unique natural archives of Lake George. Lake George is an outstanding natural archive - it contains the longest continuous sedimentary record of any Australian lake and has a long, unresolved human occupation history. It also supplies 80 per cent of sand used in the Canberra region construction industry. This multidisciplinary study aims to determine the sedimentary, vegetation, climatic, hydrological, tectonic and ....From ancient to modern environments in southeastern Australia: evidence from the unique natural archives of Lake George. Lake George is an outstanding natural archive - it contains the longest continuous sedimentary record of any Australian lake and has a long, unresolved human occupation history. It also supplies 80 per cent of sand used in the Canberra region construction industry. This multidisciplinary study aims to determine the sedimentary, vegetation, climatic, hydrological, tectonic and archaeological history of the area, including application of cutting-edge dating methods. Project outcomes aim to increase knowledge of landscape evolution and human history in eastern Australia from an improved understanding of the responses of Lake George to past and future climate change and human impact, as well as optimising sustainable extraction of sand and gravel.Read moreRead less
East Australian climate extremes through the Holocene. The project aims to document climate variability in eastern Australia over the Holocene, the last 11,500 years. It seeks to develop Australia’s two highest-resolution Holocene climate records using novel techniques to infer past rainfall, temperature and evaporation. The project will combine the expertise of international drought and climate specialists with novel techniques developed by the Australian investigators to derive an unparalleled ....East Australian climate extremes through the Holocene. The project aims to document climate variability in eastern Australia over the Holocene, the last 11,500 years. It seeks to develop Australia’s two highest-resolution Holocene climate records using novel techniques to infer past rainfall, temperature and evaporation. The project will combine the expertise of international drought and climate specialists with novel techniques developed by the Australian investigators to derive an unparalleled record of drought duration, frequency and intensity. In particular, the project aims to determine the frequency, duration and causes of mega-droughts in eastern Australia, of which little is known. Expected project outcomes include improved decision making capacity for natural resource management, and planning.Read moreRead less
When the ice melts: a new perspective on the causes of Quaternary glacial terminations. The project will assemble an unprecedented palaeoclimate time series extending back to 1.2 million years ago that will allow marine and ice core records to be placed onto an absolute time scale. This will allow testing of fundamental hypotheses on why the Earth's climate shifts from glacial to interglacial states, with flow-on effects to climate models.
Discovery Early Career Researcher Award - Grant ID: DE120102530
Funder
Australian Research Council
Funding Amount
$375,000.00
Summary
Are northern- and southern-hemisphere climates synchronised on orbital timescales? New insight into Earth's climate history. This project will generate a very high (1-100 year) resolution palaeoclimate record in order to test whether southern hemisphere ice age climate changes 1.5 million years ago were synchronised with the northern hemisphere. This will provide a critical test of theories on the mechanisms driving glacial- interglacial climate changes.