Australian rainfall is more variable than could be expected from similar climates elsewhere in the world.Much of this additional variability is related to the impact of the El Nifio-Southern Oscillation (ENSO) on Australia.There have been long-term variations in the influence of ENSO on Australian rainfall.Variations in rainfall are closely related to variations in the diurnal temperature range, on both interannual and decadal time-scales.Only in the past decade or so has this relationship broken down, perhaps reflecting a significant shift in the operation of the climate system in this region.Mean annual rainfall in 1952-92 was significantly greater than in 1911-51, and the variability also increased, although not significantly.
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Nicholls et al. (1997) studied this question.
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