Pathways of superoxide (O 2 - ) decay in the Eastern Tropical North Atlantic

Superoxide (O 2 : 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 (O 2 ) into hydrogen peroxide (H 2 O 2 ) and vice versa. This highly reactive and very short-lived radical anion can be prod...

Full description

Bibliographic Details
Published in:Environmental Science & Technology
Main Authors: Wuttig, K, Heller, MI, Croot, PL
Format: Article in Journal/Newspaper
Language:English
Published: Amer Chemical Soc 2013
Subjects:
Earth Sciences
Oceanography
Chemical Oceanography
North Atlantic
Online Access:https://doi.org/10.1021/es401658t
http://www.ncbi.nlm.nih.gov/pubmed/23915117
http://ecite.utas.edu.au/103234
Description
Summary:Superoxide (O 2 : 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 (O 2 ) into hydrogen peroxide (H 2 O 2 ) 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 O 2 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.

Similar Items