By JR on Thursday, May 19, 2016
Do Warmists actually think? Mismatch between CO2 and temperature changes
It sometimes seems not. This post is a reaction to the generally correct statement in the excerpt below to the effect that CO2 levels have been rising steadily for a long time now. The problem is the second statement: That increased CO2 levels cause warming. In combination, those two statements are inconsistent with the evidence. In particular, warming levels behave quite differently from CO2 levels. The two are simply not correlated. They don't covary. And without correlation there is no causation.
For instance, CO2 levels DID rise steadily in C21 but temperatures did not. It was only in 2015 under the influence of El Nino that temperatures rose. And as luck would have it, that was precisely the one year in which CO2 levels stagnated. 2015 CO2 levels at Mauna Loa just fluctuated up and down from month to month around the 400ppm mark.
The 4th column is the actual average CO2 level in ppm.
So at no point in C21 did temperatures and CO2 levels rise at the same time. They were two independent phenomena.
The figures from Cape Grim showed more change but from August on the CO2 level was stuck on 398 ppm. And late 2015 was precisely the time when El Nino was most influential and the temperature rise was greatest. Putting it another way, any warming from August on (inclusive) was NOT an effect of a CO2 rise -- because there was no CO2 rise. That rather knocks out most of the warming in 2015 as due to CO2. So again, temperature and CO2 did not mirror one another.
The Warmists below just don't see that a steady CO2 rise accompanied by no temperature rise is a problem. They are robotic propagandists not scientists
Within the next couple of weeks, a remote part of north-western Tasmania is likely to grab headlines around the world as a major climate change marker is passed.
The aptly named Cape Grim monitoring site jointly run by CSIRO and the Bureau of Meteorology will witness the first baseline reading of 400 parts per million (ppm) of carbon dioxide in the atmosphere, researchers predict.
"Once it's over [400 ppm], it won't go back," said Paul Fraser, dubbed by CSIRO as the Air Man of Cape Grim, and now a retired CSIRO fellow. "It could be within 10 days."
The most recent reading on May 6 was 399.9 ppm, according to readings compiled by the CSIRO team led by Paul Krummel that strip out influences from land, including cities such as Melbourne to the north
Mark Butler, Labor's shadow environment minister, said the Cape Grim landmark reading was "deeply concerning". "While the Coalition fights about whether or not the science of climate change is real, pollution is rising. And it's rising on their watch," Mr Butler said.
Cape Grim's readings are significant because they capture the most accurate reading of the atmospheric conditions in the southern hemisphere and have records going back 40 years.
With less land in the south, there is also a much smaller fluctuation according to the seasonal cycle than in northern hemisphere sites. That's because the north has more trees and other vegetation, which take up carbon from the atmosphere in the spring and give it back in the autumn.
So while 400 ppm has been temporarily exceeded at the other two main global stations since 2013 - in Hawaii and Alaska - they have dropped back below that level once spring has arrived because of that greater seasonal variation.
David Etheridge, a CSIRO principal research scientist, said atmospheric CO2 levels had fluctuated around 280 ppm until humans' burning of fossil fuels and clearing of forests set in process rising levels of greenhouse gases almost without pause since about 1800.
"It's been upwards pretty much all of the time," Dr Etheridge told Fairfax Media. "This is a significant change, and it's the primary greenhouse gas which is leading to the warming of the atmosphere."