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Abstract. Process-based numerical models are a useful tool forstudying marine ecosystems and associated biogeochemical processes inice-covered regions where observations are scarce. To this end, CSIB v1(Canadian Sea-ice Biogeochemistry version 1), a new sea-ice biogeochemicalmodel, has been developed and embedded into the Nucleus for European Modellingof the Ocean (NEMO) modelling system. This model consists of athree-compartment (ice algae, nitrate, and ammonium) sea-ice ecosystem and atwo-compartment (dimethylsulfoniopropionate and dimethylsulfide) sea-icesulfur cycle which are coupled to pelagic ecosystem and sulfur-cycle modelsat the sea-ice–ocean interface. In addition to biological and chemicalsources and sinks, the model simulates the horizontal transport ofbiogeochemical state variables within sea ice through a one-way coupling to adynamic-thermodynamic sea-ice model (LIM2; the Louvain-la-Neuve Sea Ice Modelversion 2). The model results for 1979 (after a decadal spin-up) arepresented and compared to observations and previous model studies for a briefdiscussion on the model performance. Furthermore, this paper providesdiscussion on technical aspects of implementing the sea-ice biogeochemistryand assesses the model sensitivity to (1) the temporal resolution of thesnowfall forcing data, (2) the representation of light penetration throughsnow, (3) the horizontal transport of sea-ice biogeochemical state variables,and (4) light attenuation by ice algae. The sea-ice biogeochemical model hasbeen developed within the generic framework of NEMO to facilitate its usewithin different configurations and domains, and can be adapted for use withother NEMO-based sub-models such as LIM3 (the Louvain-la-Neuve Sea Ice Modelversion 3) and PISCES (Pelagic Interactions Scheme for Carbon and EcosystemStudies).

CSIB v1 (Canadian Sea-ice Biogeochemistry): a sea-ice biogeochemical model for the NEMO community ocean modelling framework