The biogeochemical ventures of dissolved iron and manganese across the Arctic Ocean

The spatial distributions and biogeochemical cycling of dissolved Fe (dFe) and dissolved manganese (dMn) across the Arctic Ocean were established during summer and fall 2015. The Canadian GEOTRACES transect extended from the Canada Basin (CB) to the Labrador Sea (LS) via the Canadian Arctic Archipelago (CAA). The surface, subsurface and deep water distributions for both […]

May / 15 / 2020

What controls hydrothermal plume transport of iron over 4000 km in the deep Pacific Ocean?

The striking extension of the dissolved iron and manganese plumes over more than 4000 km from their hydrothermal sources along the US GEOTRACES East Pacific Zonal Transect (EPZT) cruise (GP16) has challenged our understanding of these element cycles (Resing et al., 2015 see GEOTRACES science highlight). Fitzsimmons and co-workers (2017, see reference below) analysed the particulate […]

Mar / 23 / 2017

Unprecedented set of dissolved manganese data in the North Atlantic Ocean (US GEOTRACES cruise)

Manganese (Mn) is an essential nutrient for biological growth. In the ocean, manganese distribution is sensitive to several processes: redox conditions, photochemistry, biological activity, abiotic scavenging, and also eolian, hydrothermal and sedimentary sources. All of them are conditioning the concentration of dissolved Mn in the ocean vertical profiles as shown in the east-west ocean section […]

Jan / 08 / 2015

Overview of the dissolved iron, manganese and aluminium distributions along the North Atlantic GEOTRACES GA03 section

Three trace elements distributions (iron, manganese and aluminium) help to constrain the sources of chemical elements in the North Atlantic Ocean. Atmospheric, Mediterranean Sea and margin inputs are confirmed while the importance of the hydrothermal venting is revealed. Hatta, Measures and co-workers (2014, see references below) established an overview of dissolved iron, manganese and aluminium […]

Sep / 22 / 2014

Large amounts of soluble manganese(III) identified at the land-ocean interface

Soluble manganese(III) [Mn(III)] is a phase traditionally considered non important in aqueous redox reactions. However, applying a spectrophotometric method sensitive to Mn oxidation state, Madison and co-authors found that up 90% of the Mn in porewater collected from sediment cores in the St. Lawrence Estuary is soluble Mn(III). The authors conclude that the conceptual model […]

Oct / 28 / 2013