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| Titel |
Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation |
| VerfasserIn |
J. B. Pedro, S. O. Rasmussen, T. D. Ommen |
| 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 ; 8, no. 4 ; Nr. 8, no. 4 (2012-07-23), S.1213-1221 |
| Datensatznummer |
250005708
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| Publikation (Nr.) |
 copernicus.org/cp-8-1213-2012.pdf |
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| Zusammenfassung |
| Antarctic ice cores provide clear evidence of a close coupling
between variations in Antarctic temperature and the atmospheric
concentration of CO2 during the glacial/interglacial cycles of at
least the past 800-thousand years. Precise information on the
relative timing of the temperature and CO2 changes can assist in
refining our understanding of the physical processes involved in
this coupling. Here, we focus on the last deglaciation, 19 000 to
11 000 yr before present, during which CO2 concentrations
increased by ~80 parts per million by volume and Antarctic
temperature increased by ~10 °C. Utilising a recently
developed proxy for regional Antarctic temperature, derived from
five near-coastal ice cores and two ice core CO2 records with
high dating precision, we show that the increase in CO2 likely
lagged the increase in regional Antarctic temperature by less than
400 yr and that even a short lead of CO2 over temperature
cannot be excluded. This result, consistent for both CO2 records,
implies a faster coupling between temperature and CO2 than
previous estimates, which had permitted up to millennial-scale lags. |
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