how reliable are the "tempature histories" taken from the core samples...
I didn't know that the differing Oxygen types correlated with tempature...That makes some sense. But does the correlation lag? (ie if temp goes up this year, does the isotope fraction change this year? Or does it take thousands of years?)
If it occures this year, then how dependent is that on local conditions?
How accurate a read can we get on global temps by measuring short and/or short term tempature trends at the poles?
Also if Oxygen isotope fractions are effected by tempature, then what about other elemental isotope levels? Does the Carbon isotope fraction vary with tempature also? If so, then what do C13 levels in the ice cores tell us about historical tempatures? Urainum? Are there others that can be found in the ice cores and used for comparative purposes?
It seems to me that our sampling of historical tempature variations is very limited and thus could be very biased one way or the other.
Flame » in reply to Quit rocking the boat!
I'm just trying to ask a real question...
The whole thread (60 posts)
- Global warming - NATO freezes
- re: Global warming - NATO freezes
- Serious question: How do they tell what the past tempature of Earth was from an Ice Core?
- It is impossible to tell anything about the earth at all...
- re: Serious question: How do they tell what the past tempature of Earth was from an Ice Core?
- I still don't see why it's temperature dependent. (n/t)
- 'Heavy' water molecules will evaporate from the ocean at a different rate than light ones
- R.L. That makes sense; however, is that truely indicative of "global" tempatures or just "polar region" tempatures?
- A pretty good article at Wikipedia
- There are also small chemical differences in how differing isotopic water compositions react
- I knew that. I was just too dumb to think of it. (n/t)
- 'Heavy' water molecules will evaporate from the ocean at a different rate than light ones
- Thanks for the info.
- I still don't see why it's temperature dependent. (n/t)
- Conveyors
- "Even now, for some reason, modern temperature changes and warming seem to be mostly confined to the northern hemisphere."
- re: Global warming - NATO freezes
- re: Global warming - NATO freezes
- Chaos
- re: Global warming - NATO freezes
- re: Global warming - NATO freezes