Abstract
Mixing ratios of nonmethane hydrocarbons (NMHCs) were not enhanced in whole air samples collected within the North Atlantic Flight Corridor (NAFC) during the fall of 1997. The investigation was conducted aboard NASA's DC‐8 research aircraft, as part of the Subsonic Assessment (SASS) Ozone and Nitrogen Oxide Experiment (SONEX). NMHC enhancements were not detected within the general organized tracking system of the NAFC, nor during two tail chases of the DC‐8's own exhaust. Because positive evidence of aircraft emissions was demonstrated by enhancements in both nitrogen oxides and condensation nuclei during SONEX, the NMHC results suggest that the commercial air traffic fleet operating in the North Atlantic region does not contribute at all or contributes negligibly to NMHCs in the NAFC.
Highlights
Usage [Friedl et al, 1997], and elevated levels of nitrogen The hydrocarbon emissionsfrom aircraft are believed to be oxides(NOx), water vapor(H20), andotherspecieshavebeen small(-0.3 Tg yr-1),andmostof theemittedhydrocarbonarse measuredboth directly in the wake of aircraft [Schulte et al, in the form of Nonmethane hydrocarbon (NMHC)
Second,the aircraftemissionsof NOx, CO, andNMHCs the C2-C5 range[NationalAcademyof Sciences(NAS), 1976]. may impact both upper troposphericand lower stratospheric By contrast, Slemr et al [1998] have recently reported that ozone (03) [Johnstonet al., 1989;Beck et al, 1992; Johnson ethene,ethyne (C2H2), benzene(C6H6), and propenehad the et al, 1992; Fabian and Karcher, 1997]
The limit of detection (LOD) is different for Irvine group was responsiblefor the measurementof NMHC, each halocarbon, but none of the 16 halocarbons was below halocarbon,and alkyl nitrate mixing ratios in -140 whole air its detectionlimit at any time during SONEX
Summary
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 105, NO. D3, PAGES 3785-3793, FEBRUARY 16, 2000 I. J.Simpso1nB, .C. Sive1, ,2D. R.Blake1,N.J. Blake1,T.-Y. Chen1,,3J.P.Lopez1, B. E. Anderso4nG, . W. SachseSft.A. Vay,4 H. E. Fuelber5g,Y. Kondo6,A.M. Thompso7na, ndF. S.Rowlan1d
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