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Just before the onset of the Younger Dryas (YD) cold event, several stomatal proxy-based pCO 2 records have shown a sharp increase in atmospheric CO 2 concentration (pCO 2 ) of between ca 50 and 100 ppm, followed by a rapid decrease of similar or even larger magnitude. Here we compare one of these records, a high-resolution pCO 2 record from southern Sweden, with the...
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