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Improved interpretation of volcanic traces in ice
Date:7/8/2013

the past 200,000 years in Central America, which had been investigated in the framework of the Collaborative Research Project 574. "In our calculations, we could clearly see the differences in distribution and deposition between the northern and southern hemispheres," explains co-author and director of the working group, Dr. Kirstin Krger. The spatial deposition of sulfur particles in the bipolar ice cores, as calculated in the model, agrees well with the actually measured deposits of large volcanic eruptions, such as Pinatubo in 1991 or even of Tambora of 1815.

"If we know how volcanic sulfur particles affect the atmospheric winds, we can have a much improved interpretation of the traces of volcanic activities in the ice cores," says Dr. Toohey. For one, there are better estimates of the strength of an outbreak. And secondly, the previously undetermined traces of volcanic eruptions that could not be assigned to any particular event or volcano eruption, can now be clearly traced to their origin.

"In any case, the results of our model study give a clear indication that the bipolar variability of sulfate deposits must be taken into consideration if the traces of large volcanic eruptions are to be deduced from ice cores," says Dr. Krger, "Several research groups that deal with this issue have already contacted us to verify their data through our model results."


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Contact: Jan Steffen
jsteffen@geomar.de
Helmholtz Centre for Ocean Research Kiel (GEOMAR)
Source:Eurekalert

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