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| Titel |
An independently dated 2000-yr volcanic record from Law Dome, East Antarctica, including a new perspective on the dating of the 1450s CE eruption of Kuwae, Vanuatu |
| VerfasserIn |
C. T. Plummer, M. A. J. Curran, T. D. Ommen, S. O. Rasmussen, A. D. Moy, T. R. Vance, H. B. Clausen, B. M. Vinther, P. A. Mayewski |
| 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. 6 ; Nr. 8, no. 6 (2012-11-28), S.1929-1940 |
| Datensatznummer |
250005978
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| Publikation (Nr.) |
 copernicus.org/cp-8-1929-2012.pdf |
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| Zusammenfassung |
| Volcanic eruptions are an important cause of natural climate variability. In
order to improve the accuracy of climate models, precise dating and
magnitude of the climatic effects of past volcanism are necessary. Here we
present a 2000-yr record of Southern Hemisphere volcanism recorded in ice
cores from the high accumulation Law Dome site, East Antarctica. The ice
cores were analysed for a suite of chemistry signals and are independently
dated via annual layer counting, with 11 ambiguous years at 23 BCE, which has
presently the lowest error of all published long Antarctic ice cores.
Independently dated records are important to avoid circular dating
where volcanic signatures are assigned a date from some external information
rather than using the date it is found in the ice core. Forty-five volcanic
events have been identified using the sulphate chemistry of the Law Dome
record. The low dating error and comparison with the NGRIP (North Greenland Ice Core Project)
volcanic records (on the GICC05 timescale) suggest Law Dome is the most
accurately dated Antarctic volcanic dataset, which will improve the dating
of individual volcanic events and potentially allow better correlation
between ice core records, leading to improvements in global volcanic forcing
datasets. One of the most important volcanic events of the last two
millennia is the large 1450s CE event, usually assigned to the eruption of
Kuwae, Vanuatu. In this study, we review the evidence surrounding the
presently accepted date for this event, and make the case that two separate
eruptions have caused confusion in the assignment of this event. Volcanic
sulphate deposition estimates are important for modelling the climatic
response to eruptions. The largest volcanic sulphate events in our record
are dated at 1458 CE (Kuwae?, Vanuatu), 1257 and 422 CE (unidentified). |
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