L18_Paleoclimate-Recent-Time

Water vapor pressure as a funcon of temperature 1 atm

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Unformatted text preview: 13.6 δD = 5.6*T - 100 T = mean annual temperature ‘Dansgaard Equa=on’; Dansgaard (1964), Tellus 16, 436- 468 Each point represents the isotopic composi=on of a rain or snow sample collected from a different place on Earth with mean annual temperature given on the x- axis. - 10 - 20 - 30 - 40 - 50 - 50 - 30 - 10 10 30 Mean Annual Temperature (C) Sharp 2007 Why is there a “temperature effect” (Is it really a temperature effect? Maybe it is simply a la=tude effect?) Can we use this apparent “temperature effect” to study past climates? To understand the temperature effect, we need to consider two observa=ons… Observa=on #1: Water vapor is always depleted in the heavy isotope compared to liquid water closed container δ18O = - 9 ‰ vapor δ18O...
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