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The impact of Arctic denitrification is seen in the extremely low values for the geochemical tracer of microbial nitrogen (N) cycle source/sink processes N⁎⁎ (Mordy et al. 2010). The utility of N⁎⁎ as an oceanic tracer of microbial N cycle processes, however, relies on the assumption that phytoplankton utilize dissolved N and P in Redfield proportions, and thus changes in N⁎⁎ are due to either N2-fixation...
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