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The Discovery of Global Warming May 2003
Variations of oxygen isotopes in the Camp Century ice core (with changes from a smoothed curve set off in black), going back 14,000 years. Higher temperatures to right. (Difference of isotopes in parts per thousand graphed against years Before Present.) Below: In the ice trench. Dansgaard et al., chapter 3 of Karl K. Turekian, ed., The Late Cenozoic Glacial Ages, copyright © Yale University Press, 1971. Viewing a section of core, 1964. Compare the picture here of the 1989-92 GISP trench. BACK to Climate Cycles Photo by David Atwood, U.S. Army-ERDC-CRREL (Cold Regions Research and Engineering Laboratory), courtesy Herb Ueda.