- Atmospheric CO₂ records for the centennial scale cooling event 8200 years ago (8.2 ka event) may
help us understand climate-carbon cycle feedbacks under interglacial conditions, which are important for
understanding future climate, but existing records do not provide enough detail. Here we present a new CO₂
record from the Siple Dome ice core, Antarctica, that covers 7.4–9.0 ka with 8 to 16 year resolution. We observe a
small, about 1–2 ppm, increase of atmospheric CO₂ during the 8.2 ka event. The increase is not significant when
compared to other centennial variations in the Holocene that are not linked to large temperature changes. Our
results do not agree with leaf stomata records that suggest a CO₂ decrease of up to ~25 ppm and imply that the
sensitivity of atmospheric CO₂ to the primarily Northern Hemisphere cooling of the 8.2 ka event was limited.