Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.a44a..02c&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #A44A-02
Other
1827 Glaciology (1863), 1863 Snow And Ice (1827), 8409 Atmospheric Effects (0370), 8450 Planetary Volcanism (5480), 9310 Antarctica
Scientific paper
The Holocene volcanic record, as recorded in the Antarctic ice sheet, has been reconstructed by using the sulfate record of the EDC96 ice core, drilled in the framework of the European Project for Ice Coring in Antarctica (EPICA). The number of volcanic signatures recovered in the EDC96 ice core during the Holocene is 95, with a mean value of 7.9 events per millennium. The distribution of the volcanic frequencies per millennium is here compared with data from other Antarctic ice cores, showing that the last 2000 years were characterized by an enhanced volcanism. The comparison of the volcanic flux profiles in several Antarctic cores reveals a good agreement in the dating of the signatures recorded in the last millennium, but the fit among the volcanic events becomes more and more poor going back in time. Volcanic fluxes show a large variability for isochronous signatures in different Antarctic cores during the last millennium. A flux normalization procedure, obtained by dividing the flux of each event by the Tambora (1815) flux in the same core, was used to compare the intensity of the signatures recorded in different locations. In addition, the standard deviations associated with the ratios of isochronous signatures at different sites show the highest variability in the 1100-1500 A.D. period. This result was interpreted in terms of changes in regional atmospheric transport and linked to climatic changes that occurred during the last millennium.
Becagli Silvia
Castellano Emiliano
Hansson Magnus
Petit Jerome
Rampino Michael R.
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