Millennial variations in atmospheric CO₂ during the early Holocene (11.7–7.4 ka)

International audienceWe present a new high-resolution record of atmospheric CO 2 from the Siple Dome ice core, Antarctica, over the early Holocene (11.7-7.4 ka) that quantifies natural CO 2 variability on millennial timescales under interglacial climate conditions. Atmospheric CO 2 decreased by ∼ 10 ppm between 11.3 and 7.3 ka. The decrease was punctuated by local minima at 11.1, 10.1, 9.1, and 8.3 ka with an amplitude of 2-4 ppm. Although the explanations of carbon cycle mechanisms remain uncertain due to insufficient paleoclimate records and model simulations, these variations correlate with proxies for solar forcing and local climate in the southeast Atlantic polar front, eastern equatorial Pacific, and North Atlantic. Additional CO 2 measurements using betterquality ice cores and carbon cycle models are needed to confirm the observation