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Pathways of superoxide (O2-) decay in the Eastern Tropical North Atlantic

Citation

Wuttig, K and Heller, MI and Croot, PL, Pathways of superoxide (O2-) decay in the Eastern Tropical North Atlantic, Environmental Science and Technology, 47, (18) pp. 10249-10256. ISSN 0013-936X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 American Chemical Society

DOI: doi:10.1021/es401658t

Abstract

Superoxide (O2: IUPAC name dioxide (1−)) is an important transient reactive oxygen species (ROS) in the ocean formed as an intermediate in the redox transformation of oxygen (O2) into hydrogen peroxide (H2O2) and vice versa. This highly reactive and very short-lived radical anion can be produced both via photochemical and biological processes in the ocean. In this paper we examine the decomposition rate of O2 throughout the water column, using new data collected in the Eastern Tropical North Atlantic (ETNA) Ocean. For this approach we applied a semi factorial experimental design to identify and quantify the pathways of the major identified sinks in the ocean. In this work we occupied six stations, two on the West African continental shelf and four open ocean stations, including the CVOO time series site adjacent to Cape Verde. Our results indicate that, in the surface ocean impacted by Saharan aerosols and coastal sediment resuspension, the main decay pathways for superoxide are via reactions with Mn(II) and organic matter.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water not elsewhere classified
UTAS Author:Wuttig, K (Dr Kathrin Wuttig)
ID Code:103234
Year Published:2013
Web of Science® Times Cited:34
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-09-29
Last Modified:2017-11-01
Downloads:0

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