During the 2020 La Nina, many areas of Australia received near average to severely below-average rainfall, particularly during November. CLEX researchers found that several compounding factors contributed to the drier-than anticipated spring conditions.
It has long been suggested in the literature, and discussed casually by meteorologists, that rainfall in Melbourne often occurs as lines of precipitation. However, this had yet to be quantified. CLEX researchers analysed 15 years of radar data from the Australian Radar Archive, using an objective method to identify and track these ‘linear systems’ based on radar reflectivity, size, and shape characteristics.
Due to the lack of appropriate historical datasets, quantification of shifts in global extreme precipitation intensity has not been possible so far. This project will use a recently developed long-term global dataset of daily precipitation alongside a dataset of global temperature changes to calculate the CC scaling for broad climatic regions across the globe.
Sopia Lestari (CLEX/University of Melbourne). Understanding variability of rainfall extremes in Jakarta and surrounding regions. Location: Online (Teams). Please email sig-seminars-admin@bom.gov.au for details of Microsoft Teams link to join.
In this study, CLEX researchers aimed to evaluate the effect of different sources of data and the uncertainties in satellite data, by comparing the data with a ground-based radar product using both location-based and storm-based approaches.
Welcome to the first Weather and Climate Interactions RP report. The new program name is simply a result of rationalising CLEX’s continuing research program under new headings that more clearly delineate the focus of the work we do.
Until now, flash drought research has been on the regional scale and has been limited to observations and reanalyses. CLEX researchers have been the first to examine flash drought in climate models.
This paper used statistical techniques to investigate changes in extreme climate events that currently occur, on average, only once every 20 years. These techniques are applied to data related to heat, rainfall, drought and conditions conducive to bushfires and thunderstorms from detailed climate modelling commissioned by NSW and ACT Governments.
CLEX researchers have developed a new global land-based daily precipitation dataset called Rainfall Estimates on a Gridded Network - REGEN - aimed at facilitating studies to understand changes and variability in several aspects of daily precipitation distributions, extremes and measures of hydrological intensity.
Using atmospheric model experiments, researchers have shown that the warming of the tropical Indian Ocean relative to the other two tropical ocean basins can effectively control Walker Circulation changes in the Pacific and Atlantic oceans and influence climate far beyond the Indian Ocean region.