Document Type

Article

Publication Title

Geophysical Research Letters

Rights and Access Note

This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s).

Publication Date

9-1-1996

First Page

2513

Last Page

2516

Issue Number

18

Volume Number

23

Abstract/ Summary

Continuous measurements of SO42− and electrical conductivity (ECM) along the GISP2 ice core record the Toba mega‐eruption at a depth 2590.95 to 2091.25 m (71,000±5000 years ago). Major chemical species were analyzed at a resolution of 1 cm per sample for this section. An ∼6‐year long period with extremely high volcanic SO42− coincident with a 94% depletion of nitrate and 63% depletion of chloride is observed at the depth of the Toba horizon. Such a reduction of chloride in a volcanic layer preserved in an ice core has not been observed in any previous studies. The nearly complete depletion of nitrate (to 5 ppb) encountered at the Toba level is the lowest value in the entire ∼250,000 years of the GISP2 ice core record. We propose possible mechanisms to explain the depletion of nitrate and chloride resulting from this mega‐eruption.

Citation/Publisher Attribution

Yang, Q., P. A. Mayewski, G. A. Zielinski, M. Twickler, and K. C. Taylor (1996), Depletion of atmospheric nitrate and chloride as a consequence of the Toba Volcanic Eruption, Geophys. Res. Lett., 23(18), 2513–2516, doi:10.1029/96GL02201. http://www.agu.org/pubs/crossref/1996/96GL02201.shtml

Publisher Statement

© Copyright American Geophysical Union

DOI

10.1029/96GL02201

Version

publisher's version of the published document

Download

Share

 

Rights Statement

In Copyright - Educational Use Permitted.