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Oxygen-17 excesses in products of stratospheric volcanic eruptions and depletion of the ozone layer

Bindeman, I. and Eiler, J. and Arna-Wojcicki, A. M. (2005) Oxygen-17 excesses in products of stratospheric volcanic eruptions and depletion of the ozone layer. Geochimica et Cosmochimica Acta, 69 (10). A448-A448. ISSN 0016-7037. doi:10.1016/j.gca.2005.03.030.

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Volcanic eruptions inject tens to many hundreds of megatons of SO_2 into the troposphere and stratosphere. The intensity and duration of climate cooling are dependent on the residence time of sulfate aerosols, which in turn are controlled by oxidative pathways of SO_2 by ozone, H_2O_2, or OH radicals. These reactions lead to mass independent fractionations (MIF) of sulfur and oxygen isotopes in sulfate aerosols (Bao et al. 2003 and Savarino et al. 2003a,b), measured in ash leachates and Antarctic ice. Previous studies have not revealed a clear relationship between the sizes of volcanic eruption and magnitude of MIF’s in the sulfate deposited by those eruptions. We present results of a survey of stable isotope compositions, including Δ^(17)O, of sulfate associated with 9 explosive eruptions between 2 Ma and the present that cover much of the diversity of sizes and the character of volcanic eruptions. We studied the 0.64Ma, Lava Creek Tuff of Yellowstone in particular detail. We also measured pedogenic sulfate cements in loess, till, soil, and salts that underlie and overly ash layers; we found that they either do not contain sulfate, or contain sulfate with Δ^(17)O <0.2‰. Thus, the observed anomaly in the ash is a property of the volcanogenic sulfate and not of other sulfate.

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Additional Information:© 2005 Elsevier Ltd.
Issue or Number:10
Record Number:CaltechAUTHORS:20130716-080115779
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Official Citation:Goldschmidt Conference Abstracts 2005, Geochimica et Cosmochimica Acta, Volume 69, Issue 10, Supplement, 15 May 2005, Pages 401-450, ISSN 0016-7037,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39378
Deposited By: Tony Diaz
Deposited On:17 Jul 2013 22:04
Last Modified:09 Nov 2021 23:44

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