Piero wrote:
> E come pu� la temperatura influenzare la composizione di un gas a livello di
> isotopi? Solo le reazioni nucleari posso tanto....
> O � sufficiente la lieve differenza di massa?
La seconda che hai scritto.
"The basis for paleoclimatic interpretations of variations in the stable
isotope content of water molecules is that the vapor pressure of
H(1)2O(16) is higher than that of HDO(16) and H2O(18) (10% higher than
HDO, 1% higher than H2O(18)). Evaporation from a water body thus results
in a vapor that is poorer in deuterium and O(18) than the initial water;
conversely, the remaining water is (relatively speaking) enriched
in deuterium and O(18)."
Vedi:
http://rivernet.ncsu.edu/courselocker/PaleoClimate/Ice%20Cores.pdf
Ciao
Mario Leigheb
Received on Wed Feb 15 2006 - 08:23:00 CET