Saturday, 16 October 2021

Australia experiencing more heat, less rain

AAP: Joel Carrett, file

CANBERRA: Australia is facing extreme heat, rising oceans and declining rainfall as a result of global warming, a landmark report has found. The Commonwealth Scientific and Industrial Research Organization (CSIRO) and Bureau of Meteorology (BOM) on Thursday published the biennial State of the Climate report.

It found that Australia’s climate has warmed by over one degree Celsius since 1910, as have sea surface temperatures in the oceans surrounding Australia.

The amount of carbon dioxide in the atmosphere is up 46 percent from pre-industrial levels to a level not seen for at least 800,000 years.

“In line with global trends, our data shows that Australia’s climate is continuing to warm, with eight of the 10 warmest years on record occurring since 2005,” Helen Cleugh, director of the CSIRO’s Climate Science Center, wrote in the report.

“This warming is caused by

increased greenhouse gases, such as carbon dioxide, in the atmosphere.”

“Australia is already experiencing climate change now and there are impacts being experienced or felt across many communities and across many sectors.”

Key findings of the report included that Australia’s bushfire seasons have become longer and more severe, the number of extreme heat days is trending upward and sea levels around Australia have risen 20 cm since records began.

The amount of annual rainfall in south-western Australia has declined 20 percent since 1970 and by 11 percent in the south-east between April and October, leading to increased fire danger in the summer months.

“As the planet has warmed, we’ve pushed the cold fronts and cut off lows that bring this rainfall to the southern parts of the continent, further south,” said Karl Braganza, manager of climate monitoring at the BOM.

“In 17 of the past 20 years, April to October rainfall in southern Australia has been below average.”

“Often the worst fire weather occurs when you’ve had long-term drought, long-term above-average temperatures, maybe a short-term heatwave and then the meteorology that’s consistent with severe fire weather and the ability for fire to spread.”

“It’s those types of compound events that are going to be most challenging going forward in terms of adapting to climate change in Australia.”

This marks the first time that the report has drawn attention to “compound extreme events,” which refers to multiple variables coinciding together.

The report identified 2009’s Black Saturday fires, the worst bushfires in Australian history, as an example of compound events because of strong wind and dry thunderstorms that exacerbated conditions.

Cleugh warned that even if immediate action was taken, ocean acidification, which had risen by 30 percent since the 1800s, and ocean temperatures would continue to rise because of the CO2 already in the atmosphere.

“The temperature will increase and that will continue to contribute to the increasing number of hot days, heat extremes, and fewer cold days,” she said.

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