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GSA's top geoscience journal posts 9 new articles
Date:5/2/2013

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Combined bromine and chlorine release from large explosive volcanic eruptions: A threat to stratospheric ozone?
S. Kutterolf et al., GEOMAR, Helmholtz Centre for Ocean Research, SFB574, Wischhofstrasse 1-3, 24148 Kiel, Germany. Posted online ahead of print on 29 April 2013; http://dx.doi.org/10.1130/G34044.1.

Volcanoes of the Nicaraguan Volcanic Arc have produced 14 Plinian eruptions within the last 70,000 years. Their eruption columns and therefore released volatiles reached well into the stratosphere, where they had potential to influence atmospheric chemistry and climate. While previous research has focused on the sulfur and chlorine emissions during such large eruptions, S. Kutterolf and colleagues here present measurements of the heavy halogen bromine by means of synchrotron radiation induced micro-XRF microanalysis. Spot analyses of pre-eruptive glass inclusions trapped in minerals (0.5 to 13 ppm) were compared with those in matrix glasses of the tephras (0 to 2 ppm), which represent the post-eruptive, degassed concentrations. The concentration difference between inclusions and matrix glasses, multiplied by erupted magma mass yields estimates of 4 to 600 kilotons of degassed bromine. With respect to an assumed pre-1980 mean stratospheric background and a conservative estimation that only 10% of the halogens per eruptions reached the stratosphere additionally an average of about two times the normal global annual halogen contamination have been added per Nicaraguan Plinian eruption in the past. These results stress the importance of considering volcanic Br emissions along with Cl and sulfate aerosol in order to assess the naturally induced ozone depletion in the stratosphere and their harmful ultraviolet radiation affecting the Earth surface.


A reappraisal of the early slip history of the San Andreas fault, central Califo
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8

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