The effects of the conversion of nitrogen oxides in aircraft exhaust plumes in global models

Details The effects of the conversion of nitrogen oxides in aircraft exhaust plumes in global models The effects of the conversion of nitrogen oxides in aircraft exhaust plumes in global models

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.3013m&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 23, p. 3013-3016

Physics

12

Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Troposphere-Constituent Transport And Chemistry, Global Change: Atmosphere

Scientific paper

A parametrization is needed in global models to account for the sub-grid chemical processes taking place in the plume of an aircraft, since these processes can cause the conversion of a considerable amount of the emitted NOx to reservoir species, such as HNO3. For this purpose, the chemical conversions of nitrogen oxides in the plume of an aircraft were investigated with a newly developed model. The calculated fractions of different nitrogen compounds formed within 24 hours in the exhaust plumes, differentiated for the global domain and season, were used to modify the original aircraft NOx emissions from the ANCAT emission inventory to emissions of various nitrogen compounds and we applied these to the global Chemistry Transport Model KNMI (CTMK). The results obtained imply that neglect of aircraft plume processes in global modeling leads to an overestimation of the NOx and O3 perturbations. Compared with a CTMK calculation with unmodified aircraft NOx emissions, the NOx perturbations in the North Atlantic flight corridor (NAFC) decreased by 15%-55%, due to conversions in the plumes. The resulting O3 perturbation decreased by 15%-25%.

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