Superoxide decay rates during METEOR cruise M83/1

• Main Authors: Wuttig, Kathrin, Heller, Maija I, Croot, Peter L
• Format: Dataset
• Language: English
• Published: PANGAEA 2013
• Subjects: Climate - Biogeochemistry Interactions in the Tropical Ocean; Copper; intercept of decay rate; log-decay rate; DEPTH; water; Diethylenetriaminepentaacetic acid; decay rate; Event label; GOFLO; GO-FLO 1; GO-FLO 2; GO-FLO 3; GO-FLO 4; GO-FLO 6; GO-FLO 7; Go-Flo bottles; Iron; M83/1; M83/1_769; M83/1_771; M83/1_775; M83/1_777; M83/1_798; M83/1_801; Manganese; Meteor (1986); Sea-water; SFB754; Standard deviation; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.823500; https://doi.org/10.1594/PANGAEA.823500

Superoxide 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(||) and organic matter.