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L18_Paleoclimate-Recent-Time

# 4 kie 0 isotopic disllaon a conceptual view 15

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Unformatted text preview: ted) Rel. humidity >1 allowed (undersaturated) Rel. humidity < 1 Water vapor pressure as a func=on of temperature 1 ATM = 100 kPa To understand the temperature eﬀect, we need to consider two observa=ons… Let’s put these two observa=ons together. Step 1: consider a system with only water vapor, that is saturated with water vapor: δ18O = - 9 ‰ vapor Step 2: Cool the system. The air can no longer hold all the vapor, so liquid is formed: δ18O ≈ - 9 ‰ vapor liquid δ18O ≈ 0 ‰ The isotope “frac=ona=on” is about - 9 ‰ at typical Earth surface temperatures To understand the temperature eﬀect, we need to consider two observa=ons… Let’s put these two observa=ons together. However, since 18O preferen=ally le6 the vapor phase and entered the liquid phase, the remaining vapor must have slightly less 18O compared to the original vapor! δ18O ≈ - 9.01 ‰ vapor liquid δ18O ≈ 0 ‰...
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