Combined bromine and chlorine release from large explosive volcanic eruptions: A threat to stratospheric ozone?.

Kutterolf, Steffen, Hansteen, T. H., Appel, K., Freundt, Armin, Krüger, Kirstin, Perez, Wendy and Wehrmann, Heidi (2013) Combined bromine and chlorine release from large explosive volcanic eruptions: A threat to stratospheric ozone?. Geology, 41 (6). pp. 707-710. DOI 10.1130/G34044.1.

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Abstract

Large explosive volcanic eruptions inject gases, aerosols, and fine ashes into the stratosphere, potentially influencing climate. Emissions of chlorine (Cl) and bromine (Br) from such large eruptions play an important role for catalytic destruction of ozone in the stratosphere, but hitherto the global effects of simultaneous catastrophic release of volcanic Br and Cl into the stratosphere have not been investigated. The Br release from 14 large explosive eruptions throughout Nicaragua covering an entire subduction zone segment in the past 70 ka was determined with petrologic methods. Melt inclusions in volcanic phenocrysts were analyzed using a new optimized synchrotron–X-ray fluorescence microprobe set-up. Single eruptions produced Br outputs of 4–600 kt, giving an average Br emission of 27 kt per eruption. Using the assumption that 10% of the emitted halogens reach the stratosphere, the average Br and Cl loading to the stratosphere would be 3 ppt and 1500 ppt, respectively, which together would account for 185% of the preindustrial equivalent effective stratospheric Cl loading. We thus conclude that many large tropical volcanic eruptions had and have the potential to substantially deplete ozone on a global scale, eventually forming future ozone holes.

Document Type: Article
Keywords: Bromine, chlorine, volcanic eruptions, ozone, stratosphere
Research affiliation: OceanRep > SFB 574 > C4
OceanRep > SFB 574 > C5
OceanRep > SFB 574
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1130/G34044.1
ISSN: 0091-7613
Contribution Number:
ProjectNumber
SFB 574223
Date Deposited: 31 Jan 2012 09:17
Last Modified: 17 May 2017 12:36
URI: http://oceanrep.geomar.de/id/eprint/13596

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