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| Titel |
The jump of CO2 into the Bølling/Allerød |
| VerfasserIn |
Peter Köhler, Gregor Knorr |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033323
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| Zusammenfassung |
| During the last glacial/interglacial transition the atmospheric CO2 record as measured in the
EPICA Dome C (EDC) ice core shows a remarkable jump of nearly 11Â ppmv between
two data points which are temporally separated by 350 years only (slope of more
than 30Â ppmv per millennium) around 14,000 years before present (kyr BP). This
CO2 jump coincides with a rapid rise in atmospheric CH4 (104 ppbm in 279 years
between two points) measured in the same ice core, the onset of the Bølling/Allerød
(BA) warm period in the north and the start of the Antarctic Cold Reversal (ACR)
in the south. Atmospheric gases trapped in ice cores are, however, not precisely
recording one point in time, but average over decades to centuries. We here show that
when considering the gas age distribution the original atmospheric jump in CO2
might have been twice as large and much faster, equivalent to a slope of more than
100Â ppmv per millennium. If we further take the concomitant jump in CH4 and newly
available measurements of δ13CO2 on the EDC ice core as an evidence for massive
reorganization of the land carbon cycle and therefore assume a pure terrestrial source of this
CO2 jump a carbon release of 125 PgC in less than a century can then explain the
observations. Our line of evidence is independent from gas age uncertainties, which has to
be taken into consideration if the CO2 jump into the BA has an oceanic source. |
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