Drought, El Niño and Climate Change in Queensland over the last 200,000 years: the Lynch's Crater lake record. Lynch's Crater (Queensland) provides the longest, most sensitive terrestrial record of vegetation and climate change in the low altitude tropics. A multidisciplinary approach will exploit the potential of a core collected in 2003 through high-resolution multiproxy (sedimentology, geochemistry, stable and radiogenic isotopes, pollen, charcoal and diatoms) studies. The results will contri ....Drought, El Niño and Climate Change in Queensland over the last 200,000 years: the Lynch's Crater lake record. Lynch's Crater (Queensland) provides the longest, most sensitive terrestrial record of vegetation and climate change in the low altitude tropics. A multidisciplinary approach will exploit the potential of a core collected in 2003 through high-resolution multiproxy (sedimentology, geochemistry, stable and radiogenic isotopes, pollen, charcoal and diatoms) studies. The results will contribute substantially to the resolution of current debates on the role of the tropics in global climate forcing at a variety of temporal scales, including that of the El Niño phenomenon. The reconstruction of temperature and precipitation over the past 200,000 years will improve global climate databases and prediction models.Read moreRead less
Antarctic marine diatoms: Key to predicting the effects of global climate change on a temperature-sensitive ecosystem. This project aims to determine the effects of global climate change on Antarctic diatoms. Diatoms are a major component of the polar phytoplankton. They are sensitive to changes in their marine environment, detection of which is an essential part of the Antarctic climate change strategy. Understanding the environmental processes that cause natural variation in extant diatoms ....Antarctic marine diatoms: Key to predicting the effects of global climate change on a temperature-sensitive ecosystem. This project aims to determine the effects of global climate change on Antarctic diatoms. Diatoms are a major component of the polar phytoplankton. They are sensitive to changes in their marine environment, detection of which is an essential part of the Antarctic climate change strategy. Understanding the environmental processes that cause natural variation in extant diatoms will make it possible to reconstruct the response of fossil diatoms, preserved in marine sediments, to past climate change. This understanding is vital for predicting the effect of future anthropogenic warming on this ecosystem.Read moreRead less
PAST EAST ANTARCTIC ICE SHEET AND GLOBAL SEA-LEVEL VARIATIONS. Unique fossil-bearing, open marine sediments occur inland from the modern Antarctic coastline. These were deposited when a now-glaciated Antarctic basin became a marine embayment, during intervals of significantly reduced ice sheet volume and elevated global sea-level in the past. Urgent palaeontological, sedimentological and geochemical research on these sediments are vital to provide: directly datable in situ evidence for major i ....PAST EAST ANTARCTIC ICE SHEET AND GLOBAL SEA-LEVEL VARIATIONS. Unique fossil-bearing, open marine sediments occur inland from the modern Antarctic coastline. These were deposited when a now-glaciated Antarctic basin became a marine embayment, during intervals of significantly reduced ice sheet volume and elevated global sea-level in the past. Urgent palaeontological, sedimentological and geochemical research on these sediments are vital to provide: directly datable in situ evidence for major ice sheet retreat and global sea-level rise in the past; and quantifiable data concerning the environment during such events; an innovative opportunity to improve predictions of Antarctica's response to global warming and answer international debate about past Antarctic Ice Sheet stability.Read moreRead less
High-resolution records of climatic change in Australia, both on land and at sea covering the last 20,000 years. This project aims to determine climatic changes in the Australian region since the deglaciation commenced 20,000 years ago at a century scale or better. The information is to be obtained from high-quality records of carefully selected lakes and deep-sea cores in the Australian region. The project will rely on high-resolution chronological records of environmental changes. Several geo ....High-resolution records of climatic change in Australia, both on land and at sea covering the last 20,000 years. This project aims to determine climatic changes in the Australian region since the deglaciation commenced 20,000 years ago at a century scale or better. The information is to be obtained from high-quality records of carefully selected lakes and deep-sea cores in the Australian region. The project will rely on high-resolution chronological records of environmental changes. Several geochemical and micropalaeontological techniques will be used to determine conditions in the lakes and ocean, and links to atmospheric conditions will be determined. This information is of relevance to the international climate community which aims at modelling high-quality and high-resolution records of climate change.Read moreRead less
Utilizing the geological record to constrain the response of marine ecosystems and global carbon cycling to warming and de-oxygenation. Earth history is punctuated by a huge variety of transitions and perturbations in climate, biogeochemical cycling, and ecosystems, some of which may hold direct future-relevant information. In the oceans, these are closely linked in a complex web of feedbacks, as well as to the oxygenation of the ocean and the ultimate geological fate of excessive carbon release ....Utilizing the geological record to constrain the response of marine ecosystems and global carbon cycling to warming and de-oxygenation. Earth history is punctuated by a huge variety of transitions and perturbations in climate, biogeochemical cycling, and ecosystems, some of which may hold direct future-relevant information. In the oceans, these are closely linked in a complex web of feedbacks, as well as to the oxygenation of the ocean and the ultimate geological fate of excessive carbon released into the atmosphere – burial of carbon in sediments. This project will develop a computer model representation of this coupled carbon-climate-life system and test this against the geological record, explore the causes and consequences of carbon release events and extinctions as well as how the ocean floor delivery and preservation of organic carbon responds.Read moreRead less
Consequences of extraterrestrial impacts on the biosphere and geosphere. This project will investigate whether high-velocity meteorite impacts can account for the Earth's mass extinctions and whether meteorite impacts and mass extinctions were synchronous. This work will help scientists understand the long-term climatic and biologic effects of massive injections of greenhouse gases into the atmosphere.
Evolving landscapes of our early South African ancestors. This project aims to reconstruct the early evolution of our genus, from 2.6 to 1.8 million years ago. This was a time of faunal and environmental change, the extinction of apelike human ancestors (Australopithecus), the speciation of a specialised human genus, Paranthropus, and the origin of our own genus, Homo. This project will study South African cave sites, the surrounding karst, and the oldest known Homo ergaster fossil to model chan ....Evolving landscapes of our early South African ancestors. This project aims to reconstruct the early evolution of our genus, from 2.6 to 1.8 million years ago. This was a time of faunal and environmental change, the extinction of apelike human ancestors (Australopithecus), the speciation of a specialised human genus, Paranthropus, and the origin of our own genus, Homo. This project will study South African cave sites, the surrounding karst, and the oldest known Homo ergaster fossil to model changing dietary patterns and landscape use by hominins. This project expects to reconstruct the early evolution of our genus and to address how species reacted to changing environmental conditions and increasing aridity.Read moreRead less
Environmental stress indicators in coral skeletons. Coral reefs are critical for Australia's tourism and fisheries industries, cultural heritage and international conservation responsibilities. The proposed research will test and document two newly identified stress indicators in corals, one of which will allow stress to be documented by visual inspection on living reef flats. Both new techniques will allow documentation of historical records of stress events, thus improving understanding of ree ....Environmental stress indicators in coral skeletons. Coral reefs are critical for Australia's tourism and fisheries industries, cultural heritage and international conservation responsibilities. The proposed research will test and document two newly identified stress indicators in corals, one of which will allow stress to be documented by visual inspection on living reef flats. Both new techniques will allow documentation of historical records of stress events, thus improving understanding of reef dynamics through intervals of climate change, and importantly, they also may help detect 'early warning signs' of poor health in living reef corals. Thus, the research will inform both palaeoclimate studies and current reef management strategies. Read moreRead less
Cosmogenic isotopes in glacial landscapes: climate change and production rates. By dating glacial deposits near Australia, we will provide new insights into climate change in our region. A better understanding of the factors that control climate change in our region will be of benefit to all Australians. We will use a tool called exposure dating that has become very important in understanding a variety of processes at the Earth's surface, many of which are poorly understood in the Australian reg ....Cosmogenic isotopes in glacial landscapes: climate change and production rates. By dating glacial deposits near Australia, we will provide new insights into climate change in our region. A better understanding of the factors that control climate change in our region will be of benefit to all Australians. We will use a tool called exposure dating that has become very important in understanding a variety of processes at the Earth's surface, many of which are poorly understood in the Australian region. Our research will ensure that Australia remains at the leading edge of the application of this technique and is included in future international research programs. Read moreRead less
Thresholds and hysteresis: how do abrupt changes in the Asian monsoon affect ecosystems and environmental processes? The effect of predicted climatic change on livelihoods and regional stability in the developing world has become a first-order strategic and security concern. Encouraging research into the impact of climate change within the Asia-Pacific is of immediate strategic and economic interest to Australia. The proposed research will document the response of tropical ecosystems to past cl ....Thresholds and hysteresis: how do abrupt changes in the Asian monsoon affect ecosystems and environmental processes? The effect of predicted climatic change on livelihoods and regional stability in the developing world has become a first-order strategic and security concern. Encouraging research into the impact of climate change within the Asia-Pacific is of immediate strategic and economic interest to Australia. The proposed research will document the response of tropical ecosystems to past climate change in order to better understand the likely consequences of future climate fluctuations.Read moreRead less