Abstract
The natural emissions of oxides of nitrogen (odd nitrogen) and ammonia from the earth's surface in the northern hemisphere are estimated to have upper limits of 3 × 1013 g(N) year?1 and 13 × 1013 g(N) year?1 respectively based on considerations of boundary layer resistance. This estimate indicates that anthropogenic emissions are a major component of the nitrate cycle in the northern hemisphere. DOI: 10.1111/j.2153-3490.1975.tb01657.x
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