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| Titel |
A Deglacial Record of Carbon Dioxide from the WAIS Divide Ice Core, Antarctica |
| VerfasserIn |
S. A. Marcott, E. J. Brook, T. Sowers, M. K. Kalk |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250059067
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| Zusammenfassung |
| Establishing the role of atmospheric CO2 during the last deglaciation has important
implications for deciphering the mechanisms associated with the transition from glacial to
interglacial states. A precise, high-resolution record of atmospheric CO2 is one essential
milestone. Existing Antarctic ice core records have provided insight into both the timing of
CO2 changes and likely sources, but lack the temporal resolution to address some important
problems. The WAIS Divide ice core has the potential to produce the highest resolution and
most well dated CO2 record for the last ~60 ka, due to the high accumulation rate at the site
(presently 20 cm/yr). This record will be key for understanding the timing and
role of CO2 changes during notable climatic intervals in the past (e.g. Antarctic
Cold Reversal, Younger Dryas). Here we present a CO2 record from WAIS Divide,
Antarctica for the period 22,000 – 8,000 years BP. Preliminary data at ~200 yr
resolution are in general agreement with previous reconstructions of CO2 during the last
20,000 years, and document the same general trends at millennial and longer scales.
Additionally, several abrupt changes in both CO2 and CH4 occur synchronously
throughout the core, which may provide insight into the mechanisms associated with
those shifts. Given the small delta-age and excellent chronologic constraints for
the WAIS Divide core, the CO2 record will document variability at the centennial
or shorter scale and thus we are currently measuring CO2 at this resolution over
critical transitions in the core (i.e. ACR), which we will also present at the meeting. |
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