February 8, 2010 – Original Source: ABC, Australia
A 750-year-old core of ice showing a link between increased snow over Antarctica and drought in south-west Western Australia could provide evidence that the climate is changing because of human activity.
Dr Tas van Ommen, from the Australian Antarctic Division, has studied the ice core taken from from Law Dome in eastern Antarctica.
His research shows that rainfall over south-west Western Australia has decreased between 15 and 20 per cent since the 1960s, while snowfall at Law Dome has increased 10 per cent over the same period.
Dr van Ommen says this suggests there’s been a change in atmospheric circulation patterns off southern Australia.
In a statement, he says that change doesn’t appear to be a natural event, and may in fact be caused by human activities that have reduced ozone and increased carbon dioxide in the atmosphere.
The research is published today in the international scientific journal Nature Geoscience.