Response of atmospheric CO₂ to the abrupt cooling event 8200 years ago Public Deposited


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  • 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.
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  • Ahn, J., E. J. Brook, and C. Buizert (2014), Response of atmospheric CO₂ to the abrupt cooling event 8200 years ago, Geophysical Research Letters, 41, 604–609. doi:10.1002/2013GL058177
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Journal Volume
  • 41
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  • 2
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Funding Statement (additional comments about funding)
  • Financial support was provided by National Science Foundation grant OPP 0944764-ANT to E.B. and the NOAA Climate and Global Change Fellowship Program to C.B., administered by the University Corporation for Atmospheric Research. This work was also supported by Basic Science Research Program through the National Research Foundation of Korea, funded by the Ministry of Education, Science and Technology (2011-0025242), and Korea Meteorological Administration Research and Development Program under grant CATER 2012-7030 to J.A.
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