(Figure 2) Dissolved manganese concentrations during POLARSTERN Cruise ANT-XXIV/3 ...

• Main Authors: Middag, Rob, de Baar, Hein J W, Laan, Patrick, Cai, P H, van Ooijen, Jan C
• Format: Dataset
• Language: English
• Published: PANGAEA 2011
• Subjects: AWI; Event label; Latitude of event; Longitude of event; DATE/TIME; Elevation of event; DEPTH, water; Bottle number; Manganese, dissolved; Quality flag; Manganese, standard deviation; CTD/Rosette, ultra clean; ANT-XXIV/3; Polarstern; Global marine biogeochemical cycles of trace elements and their isotopes GEOTRACES; International Polar Year 2007-2008 IPY; Ice Sheet; International Polar Year; IPY; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.816962; https://doi.pangaea.de/10.1594/PANGAEA.816962

The first comprehensive dataset (492 samples) of dissolved Mn in the Southern Ocean shows extremely low values of 0.04 up to 0.64 nM in the surface waters and a subsurface maximum with an average concentration of 0.31 nM (n=20; S.D.=0.08 nM). The low Mn in surface waters correlates well with the nutrients PO4 and NO3 and moderately well with Si(OH)4 and fluorescence. Furthermore, elevated concentrations of Mn in the surface layer coincide with elevated Fe and light transmission and decreased export (234Th/238U deficiency) and fluorescence. It appears that Mn is a factor of importance in partly explaining the HNLC conditions in the Southern Ocean, in conjunction with significant controls by the combination of Fe limitation and light limitation. No input of Mn from the continental margins was observed. This is ascribed to the protruding continental ice sheet that covers the shelf and shuts down the usual biological production, microbial breakdown and sedimentary geochemical cycling. The low concentrations of ... : Data was taken from the supplementary table in Middag et al. (2011b). Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...