Archive β Anions and Cations δ 18 O Dust bpcrcosuedu Ice core cross section bpcrcosuedu 16 O lighter than 18 O preferentially evaporates 18 O heavier than 16 O preferentially precipitates ID: 1026478
Download Presentation The PPT/PDF document "bpcrc.osu.edu Photo courtesy of Lonnie G..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. bpcrc.osu.edu
2. Photo courtesy of Lonnie G. Thompson
3.
4. ArchiveβAnions and Cationsδ18ODustbpcrc.osu.eduIce core cross sectionbpcrc.osu.edu
5. 16O (lighter than 18O) preferentially evaporates18O (heavier than 16O) preferentially precipitatesHigher temperatures = more energy to evaporate heavy 18O
6. Ice core dating activityYou will be given data from the Crawford Point, Greenland ice core
7. Task 1: Study the data in front of you and list 5 observations about these data.Consider trends or patterns in the data.Consider how these proxy data relate to the climate.
8.
9. Task 2: Apply the timeline of nuclear bomb testing to the radioactivity data from the ice core.This will give you the known age of the ice at a certain depth (a reference horizon).*Important note*Remember where the oldest ice is located
10. Task 3: Determine the year in which the ice core was drilled (the year at 0 m).Given the nuclear reference horizon, devise a strategy to determine the age of ice at the top.Consider your proxy data and the patterns they display.