 |
| Titel |
Quantifying distal dispersal and impact of volcanic ash from super-eruptions: an application to Campanian Ignimbrite |
| VerfasserIn |
A. Costa, A. Folch, G. Macedonio, B. Giaccio, R. Isaia, V. C. Smith |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066315
|
|
|
|
|
|
| Zusammenfassung |
| Distal and ultra-distal volcanic ash dispersal during a super-eruption was reconstructed for
the first time, providing insights into eruption dynamics and the impact of these gigantic
events. A novel computational methodology was applied to the ash fallout of the Campanian
Ignimbrite (CI), the most powerful volcanic eruption in Europe in the last 200 kyrs. The
method uses a 3D time-dependent computational ash dispersion model, an ensemble of wind
fields, and hundreds of thickness observations of the CI tephra deposit. Results reveal that
250-300 km3 of fallout material was produced during the eruption, blanketing a region of
~3.7 million km2 with more than 5 mm of fine ash. The model also indicates that the column
height was ~37-40 km, and the eruption lasted 2-4 days. The eruption would have caused a
volcanic winter within the coldest and driest Heinrich event. Fluorine-bearing leachate
from the volcanic ash and acid rain would have further affected food sources and
severely impacted Late Middle Paleolithic groups in Southern and Eastern Europe. |
|
|
|
|
|
|