Quote from Catalyst: Mark Horstman
“Since the 1970s, the south-western corner of Western Australia has suffered a dramatic decline in their winter rainfall, so rapid and so extreme that it’s like, somewhere, a giant tap is being turned off.”
What utter exaggerated twaddle.
Once again the Australian media spins normal climate variations as something caused by IPCC climate change.
The entire thrust of the show is that rainfall in “..the south-western corner of Western Australia..” dropped ~15% in the 1970’s and a scientist is quoted linking this to changes in Antarctic ice cores. The scientist – Dr Tas van Ommen
Principal Research Scientist, Ice Cores and Climate, Australian Antarctic Division, Hobart – may well be right is linking the events – we will look for a peer reviewed paper on the subject.
My point is that there are many sudden rainfall change events in Australian climate history – and from larger regions than SW WA – and little attention is put into explaining these.
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Here is a graphic of West Australian rainfall – note the sharp increase in the 1990’s – what caused that ?
Here is a graphic of Murray Darling Basin rainfall – note the sharp increase in the 1940’s – what caused that ?
You can explore the BoM data for NSW etc and that huge increase in rain about 1950 often stands out. But it is a feature that nobody wants to explain.
Maybe because it corresponds with the period of post WWII cloud seeding experiments. Sorry – not PC.
Note my graphic of Perth dam catchment rain – steady over 35 years.
Finally a graphic of Perth rain history back to 1876 – note how the pre WWI winter rain is similar to the post 1970’s rain. Who is to say what is “normal” ? I am not aware of any “tablet of stone” which tells us whether the WWI to mid 1970’s high rain era was normal – or are the slightly dryer decades before and after more “normal”.