A5001806211- Geology and Paleoclimatology Research
- Karst Systems and Hydrogeology
- Groundwater and Isotope Geochemistry
- Groundwater and Watershed Analysis
- Geological formations and processes
- Paleontology and Stratigraphy of Fossils
- Isotope Analysis in Ecology
- Pleistocene-Era Hominins and Archaeology
- Landslides and related hazards
- Archaeology and ancient environmental studies
- Hydrology and Watershed Management Studies
- Flood Risk Assessment and Management
- Geological and Geophysical Studies Worldwide
- Pacific and Southeast Asian Studies
- Marine and environmental studies
- Soil erosion and sediment transport
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Aquatic Ecosystems and Biodiversity
- Metabolomics and Mass Spectrometry Studies
- Groundwater flow and contamination studies
- Rangeland Management and Livestock Ecology
- Cryospheric studies and observations
- Advanced Chemical Sensor Technologies
Max Planck Institute for Chemistry
2020-2025
Northumbria University
2024-2025
Australian Nuclear Science and Technology Organisation
2014-2022
University of Tübingen
2019-2022
Leibniz University Hannover
2020
The University of Western Australia
2020
University of Wollongong
2020
Senckenberg Centre for Human Evolution and Palaeoenvironment
2020
UNSW Sydney
2014-2019
Environmental Earth Sciences
2019
Abstract Speleothem oxygen isotopic (δ 18 O) records are used to reconstruct past hydroclimate yet from the same cave do not always replicate. We use a global database of speleothem δ O quantify replicability show that disagreement is common worldwide, occurs across timescales and unrelated climate, depth or lithology. Our analysis demonstrates within-cave differences in mean values consistent with those dripwater, supporting ubiquitous influence flowpaths. present case study four new...
Abstract The Pliocene Epoch (∼5.3–2.6 million years ago, Ma) was characterized by a warmer than present climate with smaller Northern Hemisphere ice sheets, and offers an example of system in long‐term equilibrium current or predicted near‐future atmospheric CO 2 concentrations ( p ). A trend ice‐sheet expansion led to more pronounced glacial (cold) stages the end (∼2.6 Ma), known as “intensification Glaciation” (iNHG). We assessed spatial temporal variability ocean temperatures ice‐volume...
Abstract. Palaeoclimate information on multiple climate variables at different spatiotemporal scales is becoming increasingly important to understand environmental and societal responses change. A lack of high-quality reconstructions past hydroclimate has recently been identified as a critical research gap. Speleothems, with their precise chronologies, widespread distribution, ability record changes in local regional variability, are an ideal source such information. Here, we present new...
Abstract Unusually high δ 15 N values in the Neoarchean sedimentary record time period from 2.8 to 2.6 Ga, termed Nitrogen Isotope Event (NIE), might be explained by aerobic cycling prior Great Oxidation (GOE). Here we report strongly positive up +42.5 ‰ ~2.75 – 2.73 Ga shallow-marine carbonates Zimbabwe. As corresponding deeper-marine shales exhibit negative that are partial biological uptake a large ammonium reservoir, interpret our data have resulted hydrothermal upwelling of N-rich into...
Abstract The Saharo-Arabian Desert is one of the largest biogeographical barriers on Earth, impeding dispersals between Africa and Eurasia, including movements past hominins. Recent research suggests that this barrier has been in place since at least 11 million years ago 1 . In contrast, fossil evidence from late Miocene epoch Pleistocene episodic presence within interior water-dependent fauna (for example, crocodiles, equids, hippopotamids proboscideans) 2–6 , sustained by rivers lakes 7,8...
Abstract. Speleothems (cave deposits), used for palaeoenvironmental reconstructions, are deposited from cave drip water. Differentiating climate and karst processes within a drip-water signal is fundamental the correct identification of proxies ultimately their interpretation speleothem records. We investigate potential use trace element stable oxygen-isotope (δ18O) variations in water as palaeorainfall an Australian alpine site. This paper presents first extensive hydrochemical δ18O dataset...
Abstract This study describes the first use of concurrent high-precision temperature and drip rate monitoring to explore what controls speleothem forming water. Two contrasting sites, one with fast transient slow constant dripping, in a temperate semi-arid location (Wellington, NSW, Australia), exhibit water temperatures which deviate significantly from cave air temperature. We confirm hypothesis that evaporative cooling is dominant, but so far unattributed, control causing significant...
Abstract. Limestone aeolianites constitute karstic aquifers covering much of the western and southern Australian coastal fringe. They are a key groundwater resource for range industries such as winery tourism, provide important ecosystem services habitat stygofauna. Moreover, recharge estimation is understanding water cycle, contaminant transport, management, stalagmite-based paleoclimate reconstructions. Caves offer natural inception point to observe both long-term preferential movement...
The Ethiopian rift is known for its diverse landscape, ranging from arid and semi-arid savannahs to high humid mountainous regions. Lacustrine sediments paleo-shorelines indicate water availability fluctuated dramatically deep fresh lakes, shallow highly alkaline completely desiccated lakes. To investigate the role lakes have played through time as readily available sources humans, an enhanced knowledge of pace, character magnitude these changes essential. Hydro-balance models are used...
Rationale Since their introduction more than a decade ago, isotope ratio infrared spectroscopy (IRIS) systems have rapidly become the standard for oxygen ( δ 18 O) and hydrogen 2 H) analysis of water samples. An important disadvantage IRIS is well‐documented sample‐to‐sample memory effect, which requires each sample to be analyzed multiple times before desired accuracy reached, lengthening driving up costs analyses. Methods We present an adapted set‐up calculation protocol fully automated...
Understanding the mechanisms controlling spatial heterogeneity of drip water percolation into caves is essential for interpreting karst aquifer recharge and speleothem isotopic geochemical records paleoclimate analyses. Here we present first analysis rate variability using a novel time-varying Functional Principal Component Analysis (FPCA), validated against stable isotope composition. Twenty-six sites were monitored across Harrie Wood Cave, south-east Australia, over 2.5 year period. A...
Abstract. Paleoclimate information on multiple climate variables at different spatiotemporal scales is increasingly important to understand environmental and societal responses change. A lack of high-quality reconstructions past hydroclimate has recently been identified as a critical research gap. Speleothems, with their precise chronologies, widespread distribution, ability record changes in local regional variability, are an ideal source such information. Here we present new version the...
Understanding the mechanisms controlling spatial heterogeneity of drip water percolation into caves is essential for interpreting karst aquifer recharge and speleothem isotopic geochemical records paleoclimate analyses. Here we present first analysis rate variability using a novel time-varying Functional Principal Component Analysis (FPCA), validated against stable isotope composition. Twenty-six sites were monitored across Harrie Wood Cave, south-east Australia, over 2.5 year period. A...
We present new mineralogical and geochemical data from modern sediments in the Chew Bahir basin catchment, Ethiopia. Our goal is to better understand role of sedimentary processes chemical proxy formation paleolake, a newly investigated paleoclimatic archive, provide environmental context for human evolution dispersal. Modern sediment outside currently dry playa lake floor have higher SiO 2 Al O 3 (50–70 wt.%) content compared mudflat samples. On average, samples are enriched elements such...
The Murray Darling Basin contains 40% of Australia’s farms and is subject to multi-year droughts that put severe pressure on southeast freshwater resources. Yet the long-term frequency, timing potential severity these unknown, as there are few high-resolution paleoclimate records from basin extend past instrumental era. In this study, we investigate stalagmites Careys Cave, Wee Jasper, in Murray-Darling record droughts. We use a multiproxy approach stalagmite stable isotopes, trace element...