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

Wuttig, Kathrin, Heller, Maija I. and Croot, Peter (2013) Pathways of Superoxide (O2-) decay in the Eastern Tropical North Atlantic. Environmental Science & Technology, 47 (18). pp. 10249-10256. DOI 10.1021/es401658t.

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Official URL: doi:10.1021/es401658t

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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 6 stations, 2 on the West African continental shelf and 4 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 sediment resuspension, the main decay pathways for superoxide is via reactions with Mn(II) and organic matter.

Document Type: Article
Additional Information: WOS:000330096000024
Research affiliation: OceanRep > SFB 754 > B10
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > SFB 754 > B5
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1021/es401658t
ISSN: 0013-936X
Projects: SFB754, SOPRAN, CVOO, SOLAS
Date Deposited: 19 Aug 2013 08:49
Last Modified: 07 Mar 2017 08:28
URI: http://oceanrep.geomar.de/id/eprint/21928

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