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Impact of Aircraft Emissions on NO(x) in the Lowermost Stratosphere at Northern MidlatitudesAirborne measurements of NO(x) total reactive nitrogen (NO(y)), O3 and condensation nuclei (CN) were made within air traffic corridors over the U.S. and North Atlantic regions (35-60 deg N) in the fall of 1997. NO(x) and NO(y) data obtained in the lowermost stratosphere (LS) were examined using the calculated increase in NO(y) ((delta)NO(y)) 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 NO(x) levels in the LS inasmuch as the NO(s), mixing ratios at 8.5-12 km were significantly correlated with the independent parameters of aircraft emissions, i.e., (delta)NO(y) levels and CN values. In order to estimate quantitatively the impact of aircraft emissions on NO(x), and CN, the background levels of CN and NO(x) at O3 = 100-200 ppbv were derived from the correlations of these quantities with (delta)NO(y)). On average, the aircraft emissions are estimated to have increased the NO(x) and CN values by 130 pptv and 400 STP,cc, respectively, which corresponds to 70 -/+ 30 % and 30 -/+ 20 % of the observed median values.
Document ID
19990111574
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Kondo, Y. (Nagoya Univ. Toyokawa, Japan)
Koike, M. (Nagoya Univ. Toyokawa, Japan)
Ikeda, H. (Nagoya Univ. Toyokawa, Japan)
Anderson, B. E. (NASA Langley Research Center Hampton, VA United States)
Brunke, K. E. (Christopher Newport Univ. Newport News, VA United States)
Zhao, Y. (Nagoya Univ. Toyokawa, Japan)
Kita, K. (Tokyo Univ. of Agriculture and Technology Japan)
Sugita, T. (National Inst. for Environmental Studies Tsukuba, Japan)
Singh, H. B. (NASA Ames Research Center Moffett Field, CA United States)
Liu, S. C. (Georgia Inst. of Tech. Atlanta, GA United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1999
Subject Category
Environment Pollution
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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