Impact of aircraft emissions on NOx in the lowermost stratosphere at northern midlatitudes
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Date
1999-10-15
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Citation of Original Publication
Kondo, Y., M. Koike, H. Ikeda, B. E. Anderson, K. E. Brunke, Y. Zhao, K. Kita, et al. “Impact of Aircraft Emissions on NOx in the Lowermost Stratosphere at Northern Midlatitudes.” Geophysical Research Letters 26, no. 20 (1999): 3065–68. https://doi.org/10.1029/1999GL900376.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
Airborne measurements of NOx, total reactive nitrogen (NOy), O₃, and condensation nuclei (CN) were made within air traffic corridors over the U.S. and North Atlantic regions (35–60 °N) in the fall of 1997. NOx and NOy data obtained in the lowermost stratosphere (LS) were examined using the calculated increase in NOy (ΔNOy) along five-day back trajectories as a parameter to identify possible effects of aircraft on reactive nitrogen. It is very likely that aircraft emissions had a significant impact on the NOx levels in the LS inasmuch as the NOx mixing ratios at 8.5–12 km were significantly correlated with the independent parameters of aircraft emissions, i.e., ΔNOy levels and CN values. In order to estimate quantitatively the impact of aircraft emissions on NOx and CN, the background levels of CN and NOx at O₃=100–200 ppbv were derived from the correlations of these quantities with ΔNOy. On average, the aircraft emissions are estimated to have increased the NOx and CN values by 130 pptv and 400 STP cm⁻³, respectively, which corresponds to 70±30% and 30±20% of the observed median values.