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First measurements and modeling of Δ 17 O in atmospheric nitrate
Author(s) -
Michalski Greg,
Scott Zack,
Kabiling Melanie,
Thiemens Mark H.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl017015
Subject(s) - ozone , nitrate , atmospheric sciences , nitrogen , atmospheric chemistry , paleoclimatology , environmental science , environmental chemistry , atmosphere (unit) , analytical chemistry (journal) , chemistry , mineralogy , meteorology , geology , climate change , physics , oceanography , organic chemistry
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.