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| Titel |
Volcanic synchronisation of the EPICA-DC and TALDICE ice cores for the last 42 kyr BP |
| VerfasserIn |
M. Severi, R. Udisti, S. Becagli, B. Stenni, R. Traversi |
| 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. 2 ; Nr. 8, no. 2 (2012-03-14), S.509-517 |
| Datensatznummer |
250005465
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| Publikation (Nr.) |
 copernicus.org/cp-8-509-2012.pdf |
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| Zusammenfassung |
| The age scale synchronisation between the Talos Dome and the EPICA Dome C
ice cores was carried on through the identification of several common
volcanic signatures. This paper describes the rigorous method, using the
signature of volcanic sulphate, which was employed for the last 42 kyr of
the record. Using this tight stratigraphic link, we transferred the EDC age
scale to the Talos Dome ice core, producing a new age scale for the last 12
kyr. We estimated the discrepancies between the modelled TALDICE-1 age scale
and the new scale during the studied period, by evaluating the ratio R of the
apparent duration of temporal intervals between pairs of isochrones. Except
for a very few cases, R ranges between 0.8 and 1.2, corresponding to an
uncertainty of up to 20% in the estimate of the time duration in at least
one of the two ice cores. At this stage our approach does not allow us
to unequivocally identify which of the models is affected by errors, but,
taking into account only the historically known volcanic events, we found
that discrepancies up to 200 yr appear in the last two millennia in the
TALDICE-1 model, while our new age scale shows a much better agreement with
the volcanic absolute horizons. Thus, we propose for the Talos Dome ice core
a new age scale (covering the whole Holocene) obtained by a direct transfer,
via our stratigraphic link, from the EDC modelled age scale by
Lemieux-Dudon et al. (2010). |
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