Spatio-temporal variability of compound drought heatwave events (CDHEs) in Australian agricultural regions and their impacts on cereal crops.
Skipp M, Verdon-Kidd DC
Climate Adaptation
The wheat and barley fields that feed Australia are being squeezed by heat and drought striking at the same time, and the yields show it — meaning the bread, pasta, and beer on shelves increasingly depend on how well farmers can adapt to a climate that no longer behaves as it did a generation ago.
Scientists looked at decades of weather and crop records across Australia and found that when drought and extreme heat hit at the same time, wheat and barley harvests take a serious hit. These double-trouble weather events have been happening more often and more severely since around 2003. The strongest effects show up in southern and eastern Australia, where the numbers confirm it's not just bad luck — there's a real, measurable connection between these combined weather extremes and poor harvests.
Key Findings
The frequency, severity, and geographic spread of combined drought-heatwave events increased sharply after 2000, with hotspots in western and eastern Australia during August–February.
Statistically significant negative correlations were found between these compound events and crop yields, including wheat and barley in Southern and Eastern Victoria (r = −0.49 and −0.45 respectively) and Central North Victorian barley (r = −0.41).
Several major yield decline years since 2003 aligned directly with periods of high compound drought-heatwave frequency and severity across Australian cereal-growing regions.
chevron_right Technical Summary
Simultaneous droughts and heatwaves across Australia's grain-growing regions have intensified sharply since the 2000s, and researchers have now linked these compounding climate extremes to measurable drops in wheat and barley yields — particularly in Victoria, Tasmania, and New South Wales.
Abstract Preview
The impact of climate-related hazards is on cereal crop production is a growing concern, with food security a major global issue. Among these hazards, compound drought and heatwave events (CDHEs) a...
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