The Younger Dryas
ticularly abrupt. In Greenland, temperatures rose 10°C (18°F) in a decade (Alley 2000). Other proxy records, including varved lake sediments in Europe, also display these abrupt shifts (Brauer et al. 2008). The Younger Dryas is clearly observable in paleoclimate records from many parts of the world. In the Cariaco
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Temperature Change and Carbon Dioxide Change
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www.ncei.noaa.govthe isotopes 14C and 10Be, which are preserved in tree rings and ice cores, respectively, depend on solar activity and provide a measurement of this forcing. Volcanic eruptions are preserved as layers of sulfate (SO 4 2−) in ice cores. The concentration of greenhouse gases, such as CO 2, can be measured in air bubbles trapped in ice cores.
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