Ancient ice cores drilled from Antarctic glaciers shed light on why Western Australia's South-West region is experiencing a drought on a scale that has only occurred twice before in 2,000 years.
According to Antarctic climate scientist Tas van Ommen from the Australian Antarctic Division,
The latest research, led by PhD student Yaowen Zheng, extended on Dr van Ommen’s previous work by reconstructing the snowfall in Antarctica using a longer 2037-year-old ice core from the same area. “If you see something only three times in 2000 years, and you've got one of these events now, you'd have to say we're pretty unlucky to be living through a natural event that only occurs three times in two millennia,” he said.But he said just because it had happened before, it did not mean human influence had not played a part.
Similar to the ice core research, the tree-ring research found it was likely both natural climate variability and human-caused climate change contributed to the recent decline in rainfall.
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