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Controls on redox-sensitive trace metals in the Mauritanian oxygen minimum zone

Controls on redox-sensitive trace metals in the Mauritanian oxygen minimum zone

Authors :
Insa Rapp
Christian Schlosser
Jan-Lukas Menzel Barraqueta
Bernhard Wenzel
Jan Lüdke
Jan Scholten
Beat Gasser
Patrick Reichert
Martha Gledhill
Marcus Dengler
Eric P. Achterberg
Publication Year :
2019
Publisher :
Copernicus Publications (EGU), 2019.

Abstract

The availability of the micronutrient iron (Fe) in surface waters determines primary production, N2 fixation, and microbial community structure in large parts of the world's ocean, and thus it plays an important role in ocean carbon and nitrogen cycles. Eastern boundary upwelling systems and the connected oxygen minimum zones (OMZs) are typically associated with elevated concentrations of redox-sensitive trace metals (e.g., Fe, manganese (Mn), and cobalt (Co)), with shelf sediments typically forming a key source. Over the last 5 decades, an expansion and intensification of OMZs has been observed and this trend is likely to proceed. However, it is unclear how trace-metal (TM) distributions and transport are influenced by decreasing oxygen (O2) concentrations. Here we present dissolved (d; 0.2 µm) TM data collected at seven stations along a 50 km transect in the Mauritanian shelf region. We observed enhanced concentrations of Fe, Co, and Mn corresponding with low O2 concentrations (

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....1712e44612cc0bfaed86f91954a96ace