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Nitrous oxide (N 2 O) concentrations in several lakes which varied in size, depth, and trophic state were strongly influenced by oxygen concentration. High concentrations of N 2 O (343 µ g N 2 O · liter −1 ) were found in the metalimnion of a eutrophic lake during early spring stratification when hypolimnetic O 2 and NO 3 − were already being depleted. Up to 4 µ g N 2 O · liter −1 were observed in oxygenated NO 3 − ‐containing bottom waters where both nitrification and denitrification were likely occurring.
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Knowles et al. (1981) studied this question.
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