A5040228048- Tropical and Extratropical Cyclones Research
- Precipitation Measurement and Analysis
- Climate variability and models
- Lightning and Electromagnetic Phenomena
- Meteorological Phenomena and Simulations
- Ionosphere and magnetosphere dynamics
- Climate change impacts on agriculture
- Magneto-Optical Properties and Applications
- GNSS positioning and interference
- Disaster Management and Resilience
- Landslides and related hazards
- Soil Moisture and Remote Sensing
- Fire effects on ecosystems
- Earthquake Detection and Analysis
- Flood Risk Assessment and Management
- Geophysics and Gravity Measurements
Federation University
2021-2023
CSIRO Oceans and Atmosphere
2021
The University of Melbourne
2016-2018
University of Fiji
2009
University of the South Pacific
2007
Abstract Southwest Pacific nations are among some of the worst impacted and most vulnerable globally in terms tropical cyclone (TC)-induced flooding accompanying risks. This study objectively quantifies fractional contribution TCs to extreme rainfall (hereafter, TC contributions) context climate variability change. We show that contributions substantially enhanced during active phases Madden–Julian Oscillation by El Niño conditions (particularly over eastern southwest region); this...
Abstract Atmospherics or sferics that originate from lightning discharges on propagating large distances in the Earthionosphere waveguide, particularly at night, form dispersed called tweeks. Tweeks are novel diagnostic tool to monitor nighttime D -region ionosphere. Mean equivalent electron density n em mean tweek reflection heights h m and profile have been estimated using higher harmonic tweeks recorded time between 21–03 hrs LT Suva (18.2°S, 178.3°E), Fiji, during a period March–December...
Abstract. A simple technique to estimate the distance of lightning strikes d with a single VLF electromagnetic wave receiver at station is described. The based on recording oscillatory waveforms electric fields sferics. Even though process estimating using waveform rather classical one, novel and procedure for finding proposed in this paper. adopted provides two independent estimates stroke. accuracy measurements has been improved by employing high speed (333 ns sampling rate) signal...
Abstract Tropical cyclones (TCs) are amongst the costliest natural hazards for southwest Pacific (SWP) Island nations. Extreme winds coupled with heavy rainfall and related coastal hazards, such as large waves high seas, can have devastating consequences life property. Effects of anthropogenic climate change likely to make TCs even more destructive in SWP (as that observed particularly over Fiji) elsewhere around globe, yet may occur less often. However, underpinning science quantifying...
Abstract Reconstructed weather datasets, such as reanalyses based on model output with data assimilation, often show systematic biases in magnitude when compared observations. Postprocessing approaches can help adjust the distribution so that reconstructed resemble observed closely possible. In this study, we have various statistical bias-correction quantile–quantile matching to correct from Twentieth Century Reanalysis, version 2c (20CRv2c), observation-based data. Methods included...
Fiji is prone to the devastating effects of heavy rainfall during passage tropical cyclones (TCs) and as such accurate measurement events urgent for effective disaster mitigation risk analysis. Fiji, however, has a sparse distribution rain gauges, thus there deficiency in rainfall. This gap could be filled by satellite-based estimates but before they are used, need validated against reference dataset their accuracy limitations. study validates TRMM based Multi-satellite Precipitation...
This study cross-validates the radar reflectivity Z, rainfall drop size distribution parameter (median volume diameter, Do ) and rate R estimated from Tropical Rainfall Measuring Mission (TRMM) satellite Precipitation Radar (PR), a combined PR TRMM Microwave Imager (TMI) algorithm (COM) C-band dual-polarised ground-radar (GR) for overpasses during passage of tropical cyclone (TC) non-TC events over Darwin, Australia. Two overpass TC Carlos eleven are used in this GR is taken as reference. It...
Tweek and whistler atmospherics (sferics) recorded at a low latitude station, Suva (18.2oS, 178.3oE, geomag. lat. 22.2oS, L = 1.17) Fiji, in the South Pacific region, during September 2003–July 2004 March–December 2006 were analyzed to probe nighttime D-region ionosphere plasmasphere. From first harmonic analysis of selected 1063 tweeks, path integrated ionospheric reflection height was estimated mostly between 75–97 km with median standard deviation 83.6 4.1 km, respectively. The mean...
Fiji is prone to the devastating effects of heavy rainfall during passage tropical cyclones (TCs) and as such accurate measurement events urgent for effective disaster mitigation risk analysis. Fiji, however, has a sparse distribution rain gauges, thus there deficiency in rainfall. This gap could be filled by satellite-based estimates but before they are used, need validated against reference dataset their accuracy limitations. study validates TRMM based Multi-satellite Precipitation...
Extreme wind speeds, which are typically induced by tropical cyclones (TCs) in coastal regions of Australia, an important hazard to consider the context climate change.Here, a range datasets based on direct observations, reanalyses and regional model simulations used examine trends TC-related extreme winds over Eastern Australia.Wind gust speed estimates from best-track data automatic weather station (AWS) observations calibrate reanalysis gusts Bureau Meteorology (BoM) Atmospheric...