Abstract
AbstractKnowledge of the chemical speciation of particulate manganese (pMn) is important for understanding the biogeochemical cycling of Mn and other particle‐reactive elements. Here, we present the synchrotron‐based X‐ray spectroscopy‐derived average oxidation state (AOS) of pMn in the surface Arctic Ocean collected during the United States GEOTRACES Arctic cruise (GN01) in 2015. We show that the pMn AOS is <2.4 when sampled during the day and more than ∼3.0 when sampled at night. We hypothesize that an active light‐dependent redox cycle between dissolved Mn and particulate Mn(III/IV) exists during the day‐night cycle in the surface Arctic Ocean, which occurs on the timescale of hours. The magnitude of observed pMn AOS is likely determined by the net effect of the length of the previous night and integrated light level before the end of pMn sampling.
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