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| Titel |
A reconstruction of atmospheric carbon dioxide and its stable carbon isotopic composition from the penultimate glacial maximum to the last glacial inception |
| VerfasserIn |
R. Schneider, J. Schmitt, P. Köhler, F. Joos, H. Fischer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 6 ; Nr. 9, no. 6 (2013-11-06), S.2507-2523 |
| Datensatznummer |
250085257
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| Publikation (Nr.) |
 copernicus.org/cp-9-2507-2013.pdf |
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| Zusammenfassung |
| The reconstruction of the stable carbon isotope evolution in
atmospheric CO2 (δ13Catm), as archived in
Antarctic ice cores, bears the potential to disentangle the
contributions of the different carbon cycle fluxes causing past
CO2 variations. Here we present a new record of
δ13Catm before, during and after the Marine
Isotope Stage 5.5 (155 000 to 105 000 yr BP). The dataset is archived on the data repository PANGEA® (www.pangea.de) under 10.1594/PANGAEA.817041. The record was
derived with a well established sublimation method using ice from
the EPICA Dome C (EDC) and the Talos Dome ice cores in East
Antarctica. We find a 0.4‰ shift to heavier values between
the mean
δ13Catm level in the Penultimate (~ 140 000 yr BP)
and Last Glacial Maximum (~ 22 000 yr BP), which can
be explained by either (i) changes in the isotopic composition or
(ii) intensity of the carbon input fluxes to the combined
ocean/atmosphere carbon reservoir or (iii) by long-term peat
buildup. Our isotopic data suggest that the carbon cycle evolution
along Termination II and the subsequent interglacial was controlled
by essentially the same processes as during the last 24 000 yr, but
with different phasing and magnitudes. Furthermore, a 5000 yr lag in
the CO2 decline relative to EDC temperatures is confirmed
during the glacial inception at the end of MIS5.5 (120 000 yr BP). Based on our isotopic data this lag can be explained by
terrestrial carbon release and carbonate compensation. |
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