2. I'm part of the consensus ( temp has changed slightly and humans have some minor effect, eg heat islands), even though the IPCC, Gore, et al, have it all wrong: co2 lags, not leads, temp increases.
The IPPC says what now???You say:
“…even though the IPCC, Gore, et al, have it all wrong: co2 lags, not leads, temp increases”
This is how most climatologists see it:
• Yes – CO2 lags, 10% of the time
• Yes – Gore got it wrong. At least he is wrong in 10% of the time over the past 400,000 years. He is right 90% of the time (I have not seen the movie, so I am relying on reports)
•
Ye…. What? Who said the IPCC says that CO2 is leading right now????If you were to have made the statement - ‘C02 lags temperature increases’ - every day for the past 400,000 years, you would have been right 10% of the time. Today in 2015, we are in that 10% slice of the pie.The other 90% of the time C02 leads temperature increases.The chart below shows just that. Most of the time CO2 leads temperature.
And in fact:
“CO2 lags temperature changes in the last million years of temperature history”
So if anyone asks you the question: Does CO2 lag temperature increases or does CO2 lead temperature increases? Well, the answer is YES to both.• CO2 lags temperature increases, the reasons are complex
• CO2 leads temperature increases, the reasons are complex
You could say: CO2 leads/lags temperature increase which feeds temperature as it increases C02 levels. And it really does not matter who is on first, who is who at what levels, what the lag periods are between a push to increase of either CO2 or temperature factors and how much either is actually getting amplified by. You can see changes in the rate or speed of increases, but generally the trend has also been in one direction. Up.
Well that is clear as mud. And I am sure that you are glad as heck that I cleared that up for you.
The main influencer is the Milankovitch cycle. That is take into account:
1. The shape of the Earth's orbit around the sun (eccentricity)
2. The earth's axis is as to the sun at around 23 (obliquity)
3. The earth wobbling spin around its axis (precession)
The net effects of these cycles are long term changes in the amount of sunlight hitting the earth at different seasons.
http://www.indiana.edu/~geol105/images/gaia_chapter_4/milankovitch.htm(BTW that was first up on Google. This is very widely accepted.)
Or see below (a better piece IMO):
FAQ 6.1
What Caused the Ice Ages and Other Important Climate Changes Before the Industrial Era? Here:
https://www.ipcc.ch/publications_and_data/ar4/wg1/en/faq-6-1.htmlThat CO2 could and probably was lagging was understood in 1990.
Claude Lorius predicted in a 1990 paper:
The ice-core record: climate sensitivity and future greenhouse warming that CO2 can lag and that it amplifies temperature.
"Changes in the CO2 and CH4 content have played a significant part in the glacial-interglacial climate changes by amplifying, together with the growth and decay of the Northern Hemisphere ice sheets, the relatively weak orbital forcing.
...
The paper also notes that orbital changes are one initial cause for ice ages. This was published over a decade before ice core records were accurate enough to confirm a CO2 lag.”
http://www.atmos.washington.edu/2009Q1/111/Readings/Lorius1990_ice-core.pdfIt is really puzzling to me when you say:
“…even though the IPCC, Gore, et al, have it all wrong: co2 lags, not leads, temp increases”
(Are you perhaps reading some IPPC paper that is talking about a period of time when CO2 does lead and assuming that that is their position?)
(Again, if I am wrong show me your source. I would really be interested).
In 2001 (TAR) the IPCC said:
Whatever the mechanisms involved,
lags of up to 2,000 to 4,000 years in the drawdown of CO2 at the start of glacial periods suggests that the low CO2 concentrations during glacial periods amplify the climate change but do not initiate glaciations (Lorius and Oeschger, 1994; Fischer et al., 1999). Once established, the low CO2 concentration is likely to have enhanced global cooling (Hewitt and Mitchell,1997).
Climate Change 2001: The Scientific Basis
Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate ChangeChapter 3: The Carbon Cycle and Atmospheric Carbon Dioxide
Section 3.3.2 Variations in Atmospheric CO2 during Glacial/interglacial Cycles
[Page 203]
http://www.grida.no/climate/ipcc_tar/wg1/pdf/TAR-03.pdfIn 2007 (ar4) the IPCC said:
“Although it is not their primary cause, atmospheric carbon dioxide (CO2) also plays an important role in the ice ages.
Antarctic ice core data show that CO2 concentration is low in the cold glacial times (~190 ppm), and high in the warm interglacials (~280ppm);
atmospheric CO2 follows temperature changes in Antarctica with a lag of some hundreds of years. Because the climate changes at the beginning and end of ice ages take several thousand years, most of these changes are affected by a positive CO2 feedback; that is, a small initial cooling due to the Milankovitch cycles is subsequently amplified as the CO2 concentration falls. Model simulations of ice age climate (see discussion in Section 6.4.1) yield realistic results only if the role of CO2 is accounted for.”
IPCC, 2007: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change[Page 112]
https://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-faqs.pdfIn earth's past, CO2 rise lagged temperature, so CO2 can't possibly cause global warming? This is like saying "'I saw a chicken lay an egg. That proves chickens don't come from eggs.'"— Dr. Richard Alley
UQx DENIAL101x Full interview with William Ruddiman
https://www.youtube.com/watch?v=CaUHSV6yCA8&feature=youtu.beUQx DENIAL101x 3.3.3.1 Reinforcing feedback
https://www.youtube.com/watch?v=dHozjOYHQdEJust to repeat, if anything is wrong here it is probably me and not my sources. If I am wrong about the IPPC please provide the reference, I would be interested.