Rapid atmospheric CO2 changes associated with the 8,200-years-B.P. cooling event

By applying the inverse relation between numbers of leaf stomata and atmospheric CO2 concentration, stomatal frequency analysis of fossil birch leaves from lake deposits in Denmark reveals a century-scale CO2 change during the prominent Holocene cooling event that occurred in the North Atlantic regi...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences
Main Authors: Wagner, Friederike, Aaby, Bent, Visscher, Henk
Format: Text
Language:English
Published: National Academy of Sciences 2002
Subjects:
Physical Sciences
Antarc*
Antarctica
North Atlantic
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC129389
http://www.ncbi.nlm.nih.gov/pubmed/12202744
https://doi.org/10.1073/pnas.182420699
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Summary:By applying the inverse relation between numbers of leaf stomata and atmospheric CO2 concentration, stomatal frequency analysis of fossil birch leaves from lake deposits in Denmark reveals a century-scale CO2 change during the prominent Holocene cooling event that occurred in the North Atlantic region between 8,400 and 8,100 years B.P. In contrast to conventional CO2 reconstructions based on ice cores from Antarctica, quantification of the stomatal frequency signal corroborates a distinctive temperature–CO2 correlation. Results indicate a global CO2 decline of ≈25 ppm by volume over ≈300 years. This reduction is in harmony with observed and modeled lowering of North Atlantic sea-surface temperatures associated with a short-term weakening of thermohaline circulation.

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