A5005207261- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Groundwater and Isotope Geochemistry
- Climate variability and models
- Coastal wetland ecosystem dynamics
- Fire effects on ecosystems
- Pleistocene-Era Hominins and Archaeology
- Landslides and related hazards
- Pacific and Southeast Asian Studies
- Atmospheric and Environmental Gas Dynamics
- Tree-ring climate responses
- Seismic Imaging and Inversion Techniques
- Plant Diversity and Evolution
- Tropical and Extratropical Cyclones Research
- Hydrocarbon exploration and reservoir analysis
- Soil Geostatistics and Mapping
- Marine animal studies overview
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Plant Water Relations and Carbon Dynamics
- Ecology and Vegetation Dynamics Studies
- CO2 Sequestration and Geologic Interactions
- Archaeology and ancient environmental studies
James Cook University
2015-2022
Australian Institute of Tropical Health and Medicine
2018-2022
Faculty of 1000 (United States)
2021
National University of Tierra del Fuego
2021
Australian Nuclear Science and Technology Organisation
2019
Charles Darwin University
2019
Bush Heritage Australia
2018
The isotope signatures registered in speleothems during tropical cyclones (TC) provides information about the frequency and intensity of past TCs but precise relationship between isotopic composition meteorology remain uncertain. Here we present continuous δ18O δ2H data rainfall water vapour, as well discrete samples, passage TC Ita relate evolution compositions to local synoptic scale meteorological observations. High-resolution revealed a close cyclonic features such spiral rainbands,...
Abstract We present precipitation isotope data (δ 2 H and δ 18 O values) from 19 stations across the tropics collected 2012 to 2017 under Coordinated Research Project F31004 sponsored by International Atomic Energy Agency. Rainfall samples were daily analysed for stable isotopic ratios of oxygen hydrogen participating laboratories following a common analytical framework. also calculated mean stratiform rainfall area fractions around each station over an 5° x longitude/latitude based on...
Abstract Northern Australia is a region where limited information exists on environments at the last glacial maximum (LGM). Girraween Lagoon located central northern coast of and site representative regional tropical savanna woodlands. remained perennial waterbody throughout LGM, as result retains complete proxy record last-glacial climate, vegetation fire. This study combines independent palynological geochemical analyses to demonstrate dramatic reduction in both tree cover woody richness,...
Abstract This work provides a comprehensive physically based framework for the interpretation of north Australian rainfall stable isotope record ( δ 18 O and 2 H). Until now, interpretations mainly relied on statistical relationships between amount isotopic values monthly timescales. Here, we use multiseason daily high resolution (10 min) ground‐based C‐band polarimetric radar data show that five weather types (monsoon regimes) constitute wet season each have characteristic ratio. The...
Abstract High‐frequency stable isotope data are useful for validating atmospheric moisture circulation models and provide improved understanding of the mechanisms controlling isotopic compositions in tropical rainfall. Here, we present a near‐continuous 6‐month record O‐ H‐isotope both water vapour daily rainfall from Northeast Australia measured by laser spectroscopy. The set spans wet dry seasons to help address significant knowledge gap southern hemisphere tropics. We interpret records...
Background Indigenous fire management in northern Australian savannas (beginning at least 11,000 years ago) involved frequent, small, cool, early dry season fires. This regime changed after European arrival the late 1700s to unmanaged fires that burn larger areas, season, detrimental carbon stocks and biodiversity. Aims Test hypothesis significant sequestration of pyrogenic soil accompanies reimposition an regime. Methods Savanna soils under same vegetation, but with number varying from 0 13...
Abstract Fire is an essential component of tropical savannas, driving key ecological feedbacks and functions. Indigenous manipulation fire has been practiced for tens millennia in Australian there a renewed interest understanding the effects anthropogenic burning on savanna systems. However, separating impacts natural human regimes millennial timescales remains difficult. Here we show using palynological isotope geochemical proxy records from rare permanent water body Northern Australia that...
Abstract Aims Informed management of savanna systems depends on understanding determinates composition, structure and function, particularly in relation to woody‐plant components. This needs be regionally based, both past present. In this study, Holocene plant patterns are explored at a site within the eucalypt savannas northern Australia. Australian least developed globally uniquely placed track ecological change. Location Northern Territory, Methods Palynological analyses were undertaken...
Understanding the long-term functioning of Australia's tropical savannas is central to management and conservation these ecosystems.An environmental history Darwin region's mesic savanna presented from Girraween Lagoon, approx.25 km southeast Darwin, where pollen charcoal analysis a 5 metre sediment core provides record spanning previous 12,700 years.Results show gradual development permanent water at site, surrounded by dynamic landscape changing climates local people's use fire has shaped...
Abstract We provide a 1‐year dataset of atmospheric surface CO 2 , CH 4 and H O concentrations δ 13 C‐CO values from an Australian savanna site. These semi‐arid ecosystems act as carbon sinks in wet years but the persistence sink dry is uncertain. The can be used to constrain uncertainties modelling greenhouse gas budgets, improve algorithms for satellite measurements characterize role vegetation soil modulating concentrations. found pronounced seasonal variations daily mean with increase...