Scheme of the state variables and sea-ice interactions of the BFM-SI. This version of the BFM-SI was modified after Tedesco and Vichi (2010). The square boxes represent living and non-living organic chemical functional families (CFFs). The rounded boxes represent inorganic CFFs. The black lines indicate fluxes of organic matter and the red lines fluxes of inorganic nutrients. The blue lines indicate gas exchange and the green lines biochemical reactions. The up-down double arrows highlight inorganic nutrients, organic matter, and gases exchange at the ice-atmosphere interface. The symbol of each CFF is explained in Table 1. DOI: https://doi.org/10.1525/elementa.223.f2