A5053655626- Aeolian processes and effects
- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Soil erosion and sediment transport
- Biocrusts and Microbial Ecology
- Hydrology and Sediment Transport Processes
- Atmospheric and Environmental Gas Dynamics
- Geology and Paleoclimatology Research
- Air Quality and Health Impacts
- Particle Dynamics in Fluid Flows
- Soil Geostatistics and Mapping
- Atmospheric Ozone and Climate
- Marine and environmental studies
- Rangeland Management and Livestock Ecology
- Geological formations and processes
- Tree Root and Stability Studies
- Radioactivity and Radon Measurements
- Fire effects on ecosystems
- Indigenous Studies and Ecology
- Air Quality Monitoring and Forecasting
- Climate Change and Health Impacts
- Soil Carbon and Nitrogen Dynamics
- Remote Sensing and LiDAR Applications
- Wind and Air Flow Studies
- Vehicle emissions and performance
NSW Department of Planning and Environment
2015-2024
Australian National University
2020-2024
CSIRO Land and Water
2021-2024
Commonwealth Scientific and Industrial Research Organisation
2024
Williams & Associates
2023
ACT Government
2022
NSW Environment and Heritage
2013-2020
Bush Heritage Australia
2019
Griffith University
2005-2016
Government of New South Wales
2008-2013
A theory is developed to describe the dependence upon roughness density of threshold friction velocity ratio R t , an erodible surface without that with nonerodible present. The quantified by frontal area index λ. prediction = (1 − m σλ) −½ + βλ) where β drag coefficient isolated element on substrate itself; σ basal‐to‐frontal elements; and (< 1) a parameter accounting for differences between average stress maximum at any one point. well verified four independent data sets.
[1] A critical problem in dust research is to estimate size-resolved emission rates. Several schemes have been proposed but are yet be rigorously tested against observed data. In the recent Japan-Australia Dust Experiment (JADE), fluxes were measured. this study, JADE data used test a scheme. Our aim examine whether scheme has capability predict fluxes, what ranges of parameters are, and sensitive parameters. The show that depends linearly on saltation flux thus confirm basic assumption...
Abstract. Simulations of the dust cycle and its interactions with changing Earth system are hindered by empirical nature emission parameterizations in weather climate models. Here we take a step towards improving simulations using combination theory numerical to derive physically based parameterization. Our parameterization is straightforward implement into large-scale models, as it depends only on wind friction velocity soil's threshold velocity. Moreover, accounts for two processes missing...
The spatial and temporal variability of dust emissions from different surfaces in the Lake Eyre Basin, Australia is determined using MODIS data. For 2003–6 sources 529 plumes were classified: overall 37% originated areas aeolian deposits, 30% alluvial deposits floodplains 29% ephemeral lakes or playas. At this sub‐basin scale, relative importance source geomorphologies varied primarily response to sediment supply availability was not related transport capacity, suggesting Basin a...
Field experiments using a sand particle counter and an optical clarified the links between saltation dust emission under wet weakly crusted conditions in fallow field previously cultivated with wheat Australia. A crust was formed by impact of raindroplets after small precipitation events. little soil moisture enhanced strengths aggregation even though dried. Dust concentration proportional to friction wind velocity, but proportionality dependent on ground surface conditions, such as...
Wind erosion and blowing dust threaten food security, human health ecosystem services across global drylands. Monitoring wind is needed to inform management, with explicit monitoring objectives being critical for interpreting translating information into management actions. should establish quantitative guidelines determining the relationship of indicators benchmarks that reflect tolerable production levels considering impacts to, example, processes, species, agricultural systems well-being....
Establishing mineral dust impacts on Earth's systems requires numerical models of the cycle. Differences between optical depth (DOD) measurements and modelling cycle emission, atmospheric transport, deposition indicate large model uncertainty due partially to unrealistic assumptions about emission frequency. Calibrating DOD typically in North Africa, are routinely used reduce magnitude. This calibration forces modelled emissions match but may hide correct magnitude frequency events at...
Abstract Further developments of a parameterization scheme for convective turbulent dust emission (CTDE) are presented. The is advanced by including (1) new statistical description instantaneous momentum flux, (2) correction function cohesive force to account the effect soil moisture, and (3) lifting consider vegetation roughness elements. probability density describing flux now derived from large‐eddy simulations different atmospheric stabilities. based on drag partition theory. Additional...
Abstract. Particle size distribution of dust at emission (dust PSD) is an essential quantity to estimate in studies. It has been recognized earlier research that PSD dependent on soil properties (e.g. whether sand or clay) and friction velocity, u∗, which a surrogate for surface shear stress descriptor saltation-bombardment intensity. This recognition challenged some recent papers, causing debate “invariant” the search its justification. In this paper, we analyse measured Japan Australian...
A portable field wind tunnel was used to assess the sediment flux rates of loam and sand textured soils in Mallee region southeastern Australia. Three levels crust disturbance (nil, moderate severe) simulating stock trampling were investigated. The results demonstrated importance cryptogamic crusts binding soil surface providing roughness after moderately disturbed. On loamy soil, helped maintain below erosion control target 5 g m−1 s−1 for a 65 km h−1 measured at 10 m height. Once severely...
Abstract Soil erosion redistributes soil organic carbon ( SOC ) within terrestrial ecosystems, to the atmosphere and oceans. Dust export is an essential component of (C) dioxide CO 2 budget because wind contributes C cycle by removing selectively from vast areas transporting dust quickly offshore; augmenting net loss systems. However, contribution rates release sequestration poorly understood. Here, we describe how emission omitted national accounting, underestimated source may accelerate...
Dust storms are frequent in Australia and can have a large impact on the soil resource, economy people. There been few economic studies of wind erosion worldwide only one before this study. While impacts resource at point erosion, level rises as population associated infrastructure affected by dust increases. This study estimates state New South Wales single storm called Red Dawn that passed over eastern coast 23 September 2009. Estimates for rural urban areas presented with both on-...
The advanced Himawari imager (AHI) aboard the Himawari-8 geostationary satellite provides high-frequency observations with broad coverage, multiple spectral channels, and high spatial resolution. In this paper, AHI data were used to develop an algorithm for joint retrieval of aerosol optical depth (AOD) over land surface bidirectional reflectance. Instead performing reflectance estimation before calculating AOD, AOD retrieved simultaneously using optimal method. uses atmospheric radiative...
In comparison to the major dust sources in Northern Hemisphere, Australia is a relatively minor contributor global budget. However, severe storms do occur Australia, especially drought years. this study, we simulate 22–23 October 2002 storm using an integrated model, which probably most at least past 40 The model results are compared with synoptic visibility data and satellite images for several stations, high‐volume sampler measurements. simulations then used estimate load, emission,...