JD50
Lifer
- Sep 4, 2005
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Originally posted by: LegendKiller
Originally posted by: Martin
Originally posted by: Genx87
How does one measure the temperature from 200,000 years ago? I am being honest.
btw did anybody else notice Martins graphs contradict each other?
The wiki link shows a particle concentration of nearly 400 while the 2nd graph shows 275 and CO2 and temperature being higher about 130,000 years ago.
No actually, there are no contradictions. The graph simply doesn't show it that well, since its 200 years out of 150000. But here is the same data show in a different manner:
http://ees.etf.bg.ac.yu/Predmeti/EG5OE/Uticaj%20na%20atmosferu_files/atm5.gif
How do they measure temperatures? They drill for ice cores, then measure the composition of the trapped air.
See, this is where these graphs completely lose me.
1. 140k years ago a CO2 levels went from ~180 -> 300. This 66% increase resulted in a 7 degree increase. With *NO* lag time.
2. Temps are about 0 degrees and are flat, yet CO2 levels increase from about 260 to 360, a 38% increase. If we consider the same order of magnatude = same temp increase, whcih is reasonably rationale, we would have already seen a 4 degree increase, not flat.
The reasonable explanation for this is that they are utilizing multiple sources. Vostok core goes until 1999, so why are they suddenly not using it? Why append yet another ice core AND regular air samples? That is very poor scientific process.
You make very valid points, but according to Martin, since you are not one of the "hundreds of the world's top climatologists saying one thing" your opinion is worthless. Wait a minute, unless Martin is one of the "hundreds of the world's top climatologists saying one thing" then his opinion is worthless as well. At least Martin and I agree on one thing. :laugh:
