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Response of atmospheric CO 2 to the abrupt cooling event 8200 years ago
Author(s) -
Ahn Jinho,
Brook Edward J.,
Buizert Christo
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2013gl058177
Subject(s) - ice core , holocene , northern hemisphere , centennial , climatology , environmental science , southern hemisphere , atmospheric sciences , climate change , radiocarbon dating , geology , oceanography , geography , paleontology , archaeology
Atmospheric CO 2 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 CO 2 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 CO 2 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 CO 2 decrease of up to ~25 ppm and imply that the sensitivity of atmospheric CO 2 to the primarily Northern Hemisphere cooling of the 8.2 ka event was limited.