Sea water samples collected above, within and below a pronounced oxygen minimum (0-5 µmol liter-1) were analyzed for their Mn content. Amounts of dissolved Mn slowly decreased with depth and little, if any, relationship with oxygen was found. In contrast, suspended particulate Mn values increased markedly at the top of the oxygen minimum....
Martin, John H., and George A. Knauer. 1982. "Manganese cycling in northeast Pacific equatorial waters." Journal of Marine Research 40, (4). https://elischolar.library.yale.edu/journal_of_marine_research/1626