A new article by Maurycy Żarczyński, Wojciech Tylmann, and co-authors from Bremen and Sopot has just been published in Biogeosciences. The study looks at the behavior of iron (Fe) and manganese (Mn), which are routinely used as indicators of past changes in lake-water oxygenation and water-column mixing intensity. What sets the publication apart is its use of surface sediment samples from as many as 31 cores, together with the integration of geochemical data with limnological observations. As is often the case, the interpretation of Fe and Mn as indicators is not straightforward, but both elements are clearly linked to the oxygen conditions prevailing near the lake bottom.
Żarczyński M., Enters D., Szymczycha B., Tylmann W., 2026, Spatial variability of Fe and Mn in surface lake sediments and its implications for paleoredox studies – a case study of Lake Łazduny (Poland). Biogeosciences 23, 5741–5758. https://doi.org/10.5194/bg-23-5741-2026 LINK