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Understanding autumn rain decline in SE Australia
Date:5/23/2008

According to a report from a CSIRO Wealth From Oceans Flagship study published this week in the science journal Geophysical Research Letters since 1950 Victoria has suffered a 40 per cent decline in autumn rainfall (March to May) compared to the average recorded between 196190.

The reports authors, CSIROs Dr Wenju Cai and Tim Cowan, say that the decline has been most prominent in May, which accounts for about half of the total seasonal reduction.

The identified causes show imprints of climate change influences, in part through a reduction in the number of La Nia events, and in part through changing weather systems originating from the subtropical Indian Ocean that are conducive to late autumn rainfall across Victoria.

The researchers found that since 1950 the spatially alternating high and low pressure systems (called pressure wave-trains) conducive to rainfall over southern Victoria in May have been weakening, leading to rising sea level atmospheric pressure over south-east Australia.

This weakening is reinforced by a warming of the Indian Ocean, which is at least in part due to global warming, Dr Cai says. This suggests that a component of climate change is active in southern Victoria receiving less rainfall.

Influences from the Indian Ocean sector occur in conjunction with those from the Indonesian Throughflow region, to the north of Australia. Dr Cai says higher sea surface temperatures in the Throughflow region are conducive to rainfall in central and northern south-east Australia, through the familiar tropical northwest cloud bands, which deliver rainfall to the region.

Through April and May, large increases in sea surface temperatures in the region are usually associated with a transition from an El Nio to a La Nia event, as part of cycle of the El Nio-Southern Oscillation, he says.

Mr Cowan says that in recent decades, there have been more El Nio events than La Nias. As the system spends more t
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Contact: Craig Macaulay
Craig.Macaulay@csiro.au
61-362-325-219
CSIRO Australia
Source:Eurekalert

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