Sediment cores retrieved in the Benguela coastal upwelling system off Namibia show very distinct enrichments of solid phase barium at the sulfate/methane transition (SMT). These barium peaks represent
Methods:Sampling:• Rhizon technique (Seeberg-Elverfeldt et al. 2005)SO42-:• Ion chromatography (Metrohm IC Net 2.3)Fe2+:• Ferrozine method (Stookey 1970)NH4+:•...