A5039876696- Meteorological Phenomena and Simulations
- Climate variability and models
- Tropical and Extratropical Cyclones Research
- Oceanographic and Atmospheric Processes
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- Hydrological Forecasting Using AI
- Climate change impacts on agriculture
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- Marine and fisheries research
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- demographic modeling and climate adaptation
- Effects of Environmental Stressors on Livestock
- Ruminant Nutrition and Digestive Physiology
- Pasture and Agricultural Systems
- Marine and environmental studies
- Gamma-ray bursts and supernovae
- Genetic and phenotypic traits in livestock
- Arctic and Antarctic ice dynamics
- Science and Climate Studies
- Energy Load and Power Forecasting
- Geology and Paleoclimatology Research
- Scientific Research and Discoveries
Bureau of Meteorology
2018-2023
The University of Melbourne
2013-2015
Australian Astronomical Observatory
2015
ARC Centre of Excellence for All-sky Astrophysics
2015
Australian National University
2015
ACCESS-S2 is a major upgrade to the Australian Bureau of Meteorology’s multi-week seasonal prediction system. It was made operational in October 2021, replacing ACCESS-S1. The focus addition new weakly coupled data assimilation system provide initial conditions for atmosphere, ocean, land and ice fields. model based on UK Met Office GloSea5-GC2 unchanged from ACCESS-S1, aside minor corrections enhancements. performance skill forecasts have been assessed compared There are improvements...
We present 65 optical spectra of the Type Ia SN 2012fr, 33 which were obtained before maximum light. At early times, 2012fr shows clear evidence a high-velocity feature (HVF) in Si ii λ6355 line that can be cleanly decoupled from lower velocity "photospheric" component. This HVF fades by phase −5; subsequently, photospheric component exhibits very narrow width and remains at nearly constant ∼12,000 km s−1 until least five weeks after brightness. The Ca infrared triplet similar for both v ≈...
From late January to early February 2019, a quasi-stationary monsoon depression situated over northeast Australia caused devastating floods, killing an estimated 625,000 head of cattle in northwest Queensland, and inundating 3 000 homes the coastal city Townsville. The lasted ~10 days, driving daily rainfall accumulations exceeding 200 mm/day, maximum temperatures 8–10 °C below normal, wind gusts above 70 km/h. In this study, atmospheric conditions during event its predictability on weekly...
Abstract The austral spring climate of 2020 was characterised by the occurrence La Niña, which is most predictable driver Australian springtime rainfall. Consistent with this Bureau Meteorology’s dynamical sub-seasonal to seasonal forecast system, ACCESS-S1, made highly confident predictions wetter-than-normal conditions over central and eastern Australia for when initialised in July thereafter. However, many areas received near average severely below rainfall, particularly during November....
The Tasman Sea has been identified as a climate hotspot and experienced several marine heatwaves (MHWs) in recent years. These events have impacted coastal regions of New Zealand (NZ), which had follow-on effect on local aquaculture industries. Advance warning extreme heat would enable these industries to mitigate potential losses. Here we present an assessment the forecast skill Australian Bureau Meteorology’s seasonal prediction system, Community Climate Earth-System Simulator-Seasonal...
According to the Australian Bureau of Meteorology, northern wet season extends through April, which also formally marks end Australia’s tropical cyclone season. Mid-autumn is when dry transition period begins, crop farmers prepare land for annual crops or pasture–fodder harvest, beef cattle producers make decisions regarding stock numbers and feed rationing. Potentially knowing if last rains will be later earlier than normal would valuable information sectors such as agriculture,...
We have developed a new technique called direct shear mapping (DSM) to measure gravitational lensing directly from observations of single background source. The assumes the velocity map an unlensed, stably rotating galaxy will be rotationally symmetric. Lensing distorts making it asymmetric. degree can inferred by determining transformation required restore axisymmetry. This is in contrast traditional weak methods, which require averaging ensemble ellipticity measurements, obtain...
Abstract The compound extreme weather event that impacted northern Queensland in February 2019 featured record-breaking rainfall, persistent high wind gusts and relatively cold day-time temperatures. This caused livestock losses numbering around 500,000 the northwest Gulf region. In this study, we examine chill conditions associated with week-long its potential for prediction from eleven world-leading sub-seasonal to seasonal (S2S) forecast systems. index combines daily surface temperature...
We present a first assessment of the Sea Surface Temperature (SST) and 300m Heat Content (HC) ensemble mean skill Australian Community Climate Earth-System Simulator-Seasonal v1.0 (ACCESS-S1) around New Zealand on seasonal timescales, using set retrospective forecasts for 1990-2012. This was verified against Reynolds AVHRR analysis Bluelink ReANalysis 3.5 (BRAN3.5). For inshore areas with depth <300m, model shows forecasting summer at lead time 0 months, 66% 65% grid cells having correlation...
Abstract Using both a theoretical and an empirical approach, we have investigated the frequency of low redshift galaxy-galaxy lensing systems in which signature 3D weak might be directly detectable. We find good agreement between these two approaches. data from Galaxy Mass Assembly survey estimate detectable at redshift. that below z ~ 0.6, probability galaxy being weakly lensed by γ ⩾ 0.02 is 0.01. also feasibility measuring scatter M * − h relation using shear statistics. for measurement...
Abstract Rainfall bursts are relatively short-lived events that typically occur over consecutive days, up to a week. Northern Australian industries like sugar farming and beef highly sensitive burst activity, yet little is known about the multiweek prediction of bursts. This study evaluates summer (December–March) northern Australia in observations hindcasts from Bureau Meteorology’s seasonal system, Community Climate Earth-System Simulator, Seasonal version 1 (ACCESS-S1). The main objective...
We have developed a new technique called Direct Shear Mapping (DSM) to measure gravitational lensing shear directly from observations of single background source. The assumes the velocity map an un-lensed, stably-rotating galaxy will be rotationally symmetric. Lensing distorts making it asymmetric. degree can inferred by determining transformation required restore axisymmetry. This is in contrast traditional weak methods, which require averaging ensemble ellipticity measurements, obtain...
&lt;p&gt;Extreme events such as droughts, heat waves and floods can have significant long lasting financial, infrastructural environmental impacts. While probabilistic seasonal outlooks are commonplace, there relatively few available on multiweek timescales. Additionally, many services focus the middle of distribution possible outcomes &amp;#8211; e.g., forecasts probability above or below median, mean conditions exceeding some threshold. These do not encompass types extreme that...
&lt;p&gt;In late January to early February 2019, wide-spread flooding, strong winds and relatively cold temperatures over the north-eastern Australian state of Queensland led loss an estimated 625,000 cattle 48,000 sheep. The system that caused these impacts was a quasi-stationary monsoon depression lasted close 10 days, bringing weekly rainfall totals above 1000 mm in some locations, maximum 8&amp;#8211;12&amp;#176;C below average, sustained wind speeds 30-40 km/h. same...