Flannery and his Broken Crystal Ball, page-97

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mudguts

11,710 Posts.

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30/07/21

00:03

Post #: 54886397
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Originally posted by sparassid ↑

The Perth region is getting 20% less rain than it was getting 100 years ago (and falling further every decade).

[Source]

Why is it getting less rainfall, you'd ask if you weren't dedicated ideologically-motivated deniers? This is why:

The decline in autumn and winter rainfall in the south-west is attributed to the southward shift of the subtropical ridge and the southern hemisphere polar jet stream (YouTube SW May–October rainfall animation). The associated strengthening of the polar jet stream and a 17% reduction in the strength of the subtropical jet stream over Australia has reduced the likelihood of storm development over the south-west. This is most likely the result of a weakening of the temperature gradient between the equator and the poles.

A weaker subtropical jet stream leads to slower alternation of low and high pressure systems, and weaker surface low pressure systems and cold fronts. The stronger polar jet stream is associated with low pressure anomalies over Antarctica and high pressure anomalies over the mid-latitudes. Consequent rainfall reductions over south-west WA are associated with the persistence of high pressure systems over the region. While heavy rainfall events can still occur, they are often interspersed by longer dry periods.

https://www.agric.wa.gov.au/climate-change/climate-trends-western-australia

Of course this stuff just bounces off the old lead headgear of stone-age Right-wing ideology with you lot. Most information does not penetrate, and that which does must conform to the dogma.

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And I can show you any number of reports where the rainfall has increased.

In fact the planet is greener than ever before (according to Nasa).

Just because one spot on the planet is drier, means absolutely nothing...try again....

..or does Global Warming of the planet revolve around Perths rainfall?
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