Combining nitrate, nitrite and phosphate data from several sources with additional quality control produced a database that eliminates many questionable values. This database, in turn, facilitated estimation of net community production (NCP) in the Arctic Marine System (AMS). In some regions, the new database enabled quantitative calculation of NCP over the vegetative season from changes in nutrient concentrations. In others, useful inferences were possible based on nutrient concentration patterns. This analysis demonstrates that it is possible to estimate NCP from seasonal changes in nutrients in many parts of the Arctic, however, the data were so sparse that most of our estimates for 14 sub-regions of the AMS are attended by uncertainties >50%. Nevertheless, the wide regional variation of NCP within the AMS (∼two orders of magnitude) may make the results useful. NCP for the entire AMS was estimated as 345±72TgC over the vegetative season. Converting this value to annual primary production (PP) as determined by typical ¹⁴C incubations suggests an annual primary production rate for the AMS of ∼1000TgC. We divided the AMS and its marginal seas into the same 13 sub-regions employed in the companion studies of Matrai et al. (2012) and Hill et al. (2013) and estimated NCP for each. We also made separate estimates for the Eurasian and Amerasian portions of the Arctic Basin. Significant findings include: