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• W2103595132 abstract "The 11‐level Geophysical Fluid Dynamics Laboratory (GFDL) global chemical transport model has been used to assess the impact of stratospheric NO x production on tropospheric reactive nitrogen (NO y ) concentrations. A temporally varying source function was constructed using specified two‐dimensional, monthly average O 3 , N 2 O, temperature, and surface pressure data generated by the GFDL “SKYHI” model. The calculated yearly NO y , production rate is 0.64 Tg N (0.64×10 12 g N). A wet removal scheme, which distinguishes between stable and convective rain based on the bulk Richardson number, is introduced. Simulations have been performed with a simplified chemical mechanism which fractionates NO y , into soluble and insoluble species. The role of peroxyacetyl nitrate (PAN) in determining the impact of stratospheric injection on the tropospheric NO y , budget is studied by comparing results of simulations with and without PAN chemistry. We conclude that (1) the stratospheric source is too small to account for background surface NO y , concentrations observed in the remote (i.e., regions a few thousand kilometers from continental source regions) troposphere. Surface NO y , mixing ratios seldom exceed 10 parts per trillion by volume (pptv) in the model northern hemisphere and are always below 20 pptv. Together, fossil fuel combustion emissions and stratospheric injection account for less than 10% of observed surface nitrate concentrations in the remote tropical Pacific. (2) The impact of the stratospheric source is comparable to that of the fossil fuel combustion source in terms of NO y , mixing ratios in the northern hemisphere at the 500 mbar model level and is more important in the middle and high latitudes of the southern hemisphere. At the 315 mbar model level the stratospheric source contribution to NO y , levels is more important than that of the fossil fuel source at all latitudes, except in the tropics. However, substantial contributions from other NO y sources are needed to explain observations in the remote middle and upper troposphere. (3) Inclusion of PAN chemistry has the effect of increasing model‐calculated surface NO y , mixing ratios in the northern hemisphere middle and high latitudes by factors of 1.5–3 during winter/spring and by factors of 2–4 during summer/fall. Surface NO y , mixing ratios in the southern hemisphere show a smaller increase due to slower rates of PAN formation. This is a direct result of lower hydrocarbon concentrations in the southern hemisphere." @default.
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• W2103595132 date "1991-10-20" @default.
• W2103595132 modified "2023-10-15" @default.
• W2103595132 title "The relative impact of stratospheric photochemical production on tropospheric NO_<i>y</i> levels: A model study" @default.
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• W2103595132 doi "https://doi.org/10.1029/91jd01665" @default.
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