All that global warming and nothing to show for it?
Headlines rang out telling Australians that last summer was the hottest ever. But, according to the UAH satellite series, the hottest — just barely — was in 1991, when CO2 was a wonderful, safe 356 ppm. Since then, humans have emitted more than half — fully 58% — of all the emissions we have ever emitted since we crawled out of those dank caves. CO2 levels are almost 50 ppm higher now, and temperatures are almost as high.*
Wonder if this summer will get close to the summer of 1991 (and we wonder if Victoria will keep the lights on).
The UAH data comes from NASA satellites, which cover all the Australian land mass every day and night.
The BOM (and NASA) prefers to use Australian ground data which is based on sparse thermometers that keep changing sites and equipment, are located near airport tarmacs, buildings, and cars. When readings are too cold, the BOM sometimes deletes them. Temperatures from thermometers hundreds of kilometers apart are magically homogenized and “corrected” through a secret computer process and two thirds of our warming comes from those adjustments, not from CO2 or whatever is warming the planet. To measure climate change, the BOM compares new readings from super-fast electronic one-second measurements in small 60 litre boxes to old readings from slow glass thermometers in 240 litre boxes. The agency carefully calibrates these different thermometers then throws all that data away. What’s not to like?
Here’s the BOM temperature map for summer 1991
And for summer 2019
So, 28 years later the Australian summer was about the same in the places where 24 million people live. But possibly it was hotter in places where we have almost no people and hardly any thermometers. Maybe. In the BOM’s defence it was wetter in Northern Australia in 1991 than in 2019. However this just means that if 2019 was the “hottest” then it was due to the drought, not our CO2.
Drought means higher maximums
As Roy Spencer, Ken Stewart and Bill Johnston have independently shown, rainfall cools the maximum temperatures in summer in Australia. Obviously, in summer, wet ground is cooler ground and so is the air above it. Tom Quirk has reported that the biggest differences between UAH and the BOM are in December and February.
In Australia, if the climate gets cooler we may get more droughts (due to less evaporation off the ocean), This may mean higher extreme maximums in summer than what we got during a lovely hot spell. Whatever happens, of course, a PR Bureau will call it “climate change” and they predicted it, even if they predicted the opposite.
Lower Troposphere Aust: http://vortex.nsstc.uah.edu/data/msu/v6.0/tlt/uahncdc_lt_6.0.txt
* Unlike “expert climate scientists” I’m not claiming anything about CO2 because of one hot summer then or now. I claim that CO2 is largely irrelevant because the trends are not increasing, 28 million weather balloons couldn’t find the hot spot, 1,000 tide gauges show the seas are not rising fast, nor are they accelerating. Plus the climate models are wrong on the Antarctic, and hopeless on most things.