Martijn Hermans is a Post-doctoral Researcher based at Viikki. He is specialised in electromicrobiology and marine biogeochemistry. His past research focused on the impact of cable bacteria and changes in bottom water oxygen concentrations on coastal sediment biogeochemistry. The main impetus of his current study is to implement the coupled sedimentary iron and phosphorus dynamics in relation to bottom water oxygen in the BALTSEM model, which is a coupled physical-biogeochemical model for the whole Baltic Sea. Among many applications, this model expansion can be used to gain a better mechanistic understanding of how the iron-phosphorus feedbacks drive the multidecadal oscillations in Baltic Sea hypoxia. The post-doc project is strongly supported by collaborators, such as Prof. Bo Gustafsson (Baltic Nest Institute, Stockholm University, Baltic Sea Centre) and Prof. Caroline Slomp (Utrecht University). Martijn is funded by the Academy of Finland research fellowship to Tom Jilbert 'Sedimentary trace metals: unlocking the archives of coastal marine hypoxia'.