Multiple sulfur isotope constraints on the sulfur cycle in the modern ocean

Tostevin, R. and Turchyn, A. V. and Bishop, J. K. and Eldridge, D. and Farquhar, J. and Johnston, D. T. (2014) Multiple sulfur isotope constraints on the sulfur cycle in the modern ocean. Earth and planetary science letters, 396. pp. 14-21. ISSN 0012821X DOI https://doi.org/10.1016/j.epsl.2014.03.057

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Abstract

We present 28 multiple sulfur isotope measurements of seawater sulfate (δ34SSO4δ34SSO4 and Δ33SSO4Δ33SSO4) from the modern ocean over a range of water depths and sites along the eastern margin of the Pacific Ocean. The average measured δ34SSO4δ34SSO4 is 21.24‰ (±0.88‰,2σ±0.88‰,2σ) with a calculated Δ33SSO4Δ33SSO4 of +0.050‰+0.050‰ (±0.014‰,2σ±0.014‰,2σ). With these values, we use a box-model to place constraints on the gross fraction of pyrite burial in modern sediments. This model presents an improvement on previous estimates of the global pyrite burial flux because it does not rely on the assumed value of δ34Spyriteδ34Spyrite, which is poorly constrained, but instead uses new information about the relationship between δ34Sδ34S and δ33Sδ33S in global marine sulfate. Our calculations indicate that the pyrite burial flux from the modern ocean is between 10% and 45% of the total sulfur lost from the oceans, with a more probable range between 20% and 35%.

Item Type:	Article
Additional Information:	Open Access funded by Natural Environment Research Council Copyright © 2014 The Authors. Published by Elsevier B.V. All rights reserved.
Uncontrolled Keywords:	2014AREP; IA67; OA;
Subjects:	01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions:	01 - Climate Change and Earth-Ocean Atmosphere Systems 07 - Gold Open Access 06 - Part-III Projects
Journal or Publication Title:	Earth and planetary science letters
Volume:	396
Page Range:	pp. 14-21
Identification Number:	https://doi.org/10.1016/j.epsl.2014.03.057
Depositing User:	Sarah Humbert
Date Deposited:	09 Apr 2014 13:03
Last Modified:	17 Feb 2017 12:13
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3005

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