Here we present the stable-carbon-isotope composition (δ 13CO 2) of CO 2 extracted from air trapped in ice at Taylor Dome, Antarctica, from the Last Glacial Maximum to the onset of Holocene times. But the causes of the atmospheric CO 2 concentration increases are unclear.
During the last four transitions from glacial to interglacial conditions, over which such abrupt warmings occur, ice records indicate that the CO 2 concentration of the atmosphere increased by roughly 80 to 100 parts per million by volume ( 1– 4).
The most conspicuous feature of the record of past climate contained in polar ice is the rapid warming which occurs after long intervals of gradual cooling.
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