Australian researchers find soils losing from wind erosion, dust storms

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Australian researchers find soils losing from wind erosion, dust storms

(Xinhua) 20:30, August 02, 2013

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Australian soils are losing about 1.6 million tonnes of carbon each year from wind erosion and dust storms, affecting agricultural productivity, its economy and carbon accounts, a new research from the Australian government's body for scientific research, CSIRO, found on Friday.

This CSIRO research paper "Soil organic carbon dust emission: an omitted global source of atmospheric CO2" was published in the latest issue of the journal Global Change Biology.

CSIRO research scientist Dr Adrian Chappell and an international team of experts in wind erosion and dust emission recently calculated the extent of these carbon dust emissions.

The researchers confirmed that the top soil is rich in nutrients and carbon but is increasingly being blown away by events such as the "Red Dawn" in Sydney in 2009.

A recent research estimated that the "Red Dawn" dust storm that passed over the eastern coast of Australia on Sept. 23, 2009 cost New South Wales 300 million AU dollars (almost 268.6 million US dollars), mainly for household cleaning and associated activities.

According to this research, when wind lifts carbon dust into the atmosphere it changes the amount and location of soil carbon. Some carbon falls back to the ground while some leaves Australia or ends up in the ocean.

"Carbon stored in our soils helps sustain plant growth. Our modeling shows that millions of tonnes of dust and carbon are blowing away, and it is uncertain where all that ends up," Dr Chappell said.

"We need to understand the impact of this dust carbon cycle to develop more accurate national and global estimates of carbon balances and to be able to prepare for life in a changing climate, " Adrian Chappell explained in a statement.

"Australia's carbon accounts, and even global carbon accounts, have not yet taken wind or water erosion into consideration and when this happens it could have significant impacts on how we manage our landscapes. While soil organic carbon lost through dust is not a major contributor to Australia's total emissions, it is a major factor in our deteriorating soil health," he added.

Carbon is an essential ingredient for the healthy soils which underpin Australia's capability to produce enough food to feed 60 million people.

According to the findings, this is not an issue for Australia alone. Other countries will also need to know the fate of their wind-blown carbon; countries like the United States and China with larger dust emissions will likely face similar challenges when including wind borne dust in their carbon accounting.

With the frequency and intensity of dust storms likely to increase in Australia, the impact of wind erosion would also increase.