Interpretations: Reading the Book of Earth Case Study 5.2 Unit 5 ҉ Climate of Change InTeGrate Module.

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Interpretations: Reading the Book of Earth Case Study 5.2 Unit 5 ҉ Climate of Change InTeGrate Module

High-resolution data from the GISP2 ice core, Greenland, and the Byrd ice core, Antarctica, covering the Younger Dryas interval (YD) and adjacent times. Alley R.B. PNAS 97: ©2000 by National Academy of Sciences (a) Byrd ice-isotopic data GISP2 data: (b) Temperature converted from ice- isotopic ratios (c) Accumulation in m ice/year. (d) Methane data (parts per billion by volume) (e) δ 15 N data in per mil (f) Sodium in per mil (g) Calcium in per mil Na and Ca are normalized to their mean concentration in the millennium before the Little Ice Age. The estimate of temperature in the Younger Dryas is plotted as a circle; uncertainties of about ± 3°C are not much larger than the symbol.

Methane (ppb) Age (ka) Methane (ppb) Age (ka) Methane (ppb) Age (ka) Methane (ppb) Age (ka) Methane (ppb) Age (ka) Methane (ppb) Age (ka) Methane (ppb) Age (ka) Methane (ppb) Age (ka) Methane (ppb) Age (ka) Methane (ppb) Age (ka)