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Comparison of Climate and Carbon Cycle
Dynamics During Late Quaternary
Thomas Kleinen, Elena Bezrukova, Victor Brovkin,
Hubertus Fischer, Steffi
Matthias Prange, Rima Rachmayani, Jochen Schmitt,
Robert Schneider, Michael Schulz and Pavel Tarasov
Hildebrandt, Stefanie M
Abstract Within the project COIN we investigated climate and carbon cycle
changes during late Quaternary interglacials using ice core and terrestrial archives,
as well as earth system models. The Holocene carbon cycle dynamics can be
explained both in models and data by natural forcings, where the increase in CO 2 is
due to oceanic carbon release, while the land is a carbon sink. Climate changes
during MIS 11.3 were mainly driven by insolation changes, showing substantial
differences within the interglacial. Terrestrial reconstructions and model results
agree, though data coverage leaves room for improvement. The carbon cycle
dynamics during MIS 11.3 can generally be explained by the same forcing
mechanisms as for the Holocene, while model and data disagree during MIS 5.5,
showing an increasing CO 2 trend in the model though reconstructions are constant.
δ 13 CO 2
Keywords Interglacial
Carbon cycle
MIS 11.3
Ice core data
Terrestrial data
Earth system model
CO 2
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