Solid-phase Mn speciation in suspended particles along meltwater-influenced fjords of West Greenland

Manganese (Mn) is an essential micro-nutrient that can limit or, along with iron (Fe), co-limit phytoplankton growth in the ocean. Glacier meltwater is thought to be a key source of trace metals to high latitude coastal systems, but little is known about the nature of Mn delivered to glacially-influ...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 2022-06, Vol.326 (C), p.180-198
Main Authors: van Genuchten, C.M., Hopwood, M.J., Liu, T., Krause, J., Achterberg, E.P., Rosing, M.T., Meire, L.
Format: Article
Language:English
Subjects:
Fjord biogeochemistry
Geochemistry & Geophysics
GEOSCIENCES
Oceanic redox cycles
Particulate manganese
Phyllosilicates
X-ray absorption spectroscopy
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Summary:Manganese (Mn) is an essential micro-nutrient that can limit or, along with iron (Fe), co-limit phytoplankton growth in the ocean. Glacier meltwater is thought to be a key source of trace metals to high latitude coastal systems, but little is known about the nature of Mn delivered to glacially-influenced fjords and adjacent coastal waters. In this work, we combine in-situ dissolved Mn (dMn) measurements of surface waters with Mn K-edge X-ray absorption spectroscopy (XAS) data of suspended particles in four fjords of West Greenland. Data were collected from transects of up to 100 km in fjords with different underlying bedrock geology from 64 to 70°N. We found that dMn concentrations generally decreased conservatively with increasing salinity (from 80 to 120 nM at salinity  20 nM to 
ISSN:0016-7037
1872-9533
DOI:10.1016/j.gca.2022.04.003