Doctor Jolly wrote on Feb 13
th, 2012 at 3:46pm:
tonegunman1 wrote on Feb 13
th, 2012 at 3:34pm:
Doctor Jolly wrote on Feb 13
th, 2012 at 2:27pm:
Uncle Meat wrote on Feb 13
th, 2012 at 2:13pm:
Doctor Jolly wrote on Feb 13
th, 2012 at 1:47pm:
1) If a 0.5 degree change in sea temperatures off Australia's east coast changes our whether patterns form drought 2+ years ago, to very bad flooding, dont you think our weather is very suseptable to changes in temperature ?
Changes to weather over such a short period of time are just that:
weather.
Climate and weather are
not the same thing.
This fact seems to escape many of the AGW hypothesis disciples.
Escape you. Weather is day to day events like rain, sun, fog.
Climate is much longer trends in decades, centuries, etc. All the world is relatively stable w.r.t climate (pre global warming), except for Australia's east coast (and South America's west coast), who go through this mini-climate change due to changes in pacific current called "El Nino, and La Nina".
A fantastic example of the effect of temperature (climate) on weather is being seen right now.
So we're likely to see big droughts and big deluges or more extreme variability with climate change?
As has been said by most scientists, its difficult to know exactly where and by how much things will change. If they knew that, they'd be buying up all the land that has minimal impact.
Climate change will impact the ocean currents, which will impact the land climate. A classic example of this is good old Al Gore's movie about northern hemisphere freeze in Europe, because
the warm current that comes up the atlantic stops due to global warming. (ie warming causing localised cooling*).
* - This always gets the deniers in a tis.
If La Nina becomes the predominant pattern, then we will see a lot more floods etc. If El Nino does, we will be in longer droughts. The warm current in question is the Gulfstream and the problem with this is that in March 2010 Jim Willis from NASA said it was not slowing down and this "colder than normal Northern Hemisphere winter was "
probably part of a natural cycle"
Also in March of that year has NASA saying the Gulfstream is actually speeding up by 20%. (Geophysical Research Letters, March 2010)
However by December it was a mid Atlantic High pressure system had moved the current more north making Canada and Greenland warmer but colder for Europe.
So it is a rather "movable" feast of "facts".
So and to the El Nino and La Nina events off the east coast of Australia, these are a very similar senario to that of the east coast of Australia circa late 1800's and culminating in the Federation drought. Much bigger and more widespread floods and droughts than now...
This would indicate that there is nothing new here regarding recent well publicised and attributed weather events.