Atmospheric nitrate is anomalously enriched in both the 18 O/ 16 O and 17 O/ 16 O isotopic ratios, with Δ 17 O = 20–30.8‰ (Δ 17 O = δ 17 O − .52 × δ 18 O). We have modeled the seasonal variation in Δ 17 O by utilizing the transfer of Δ 17 O from ozone to HNO 3 during NO x oxidation reactions and by evaluating the relative source strengths of heterogeneous and homogenous HNO 3 production. The implications for new insights into the global nitrogen cycle, N 2 O production and paleoclimate studies are discussed.
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Michalski et al. (2003) studied this question.
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