Impact of Aircraft NOx Emission on NOx and Ozone over China

A three-dimensional global chemistry transport model (OSLO CTM2) is used to investigate theimpact of subsonic aircraft NOx emission on NOx and ozone over China in terms of a year 2000 scenario ofsubsonic aircraft NOx emission. The results show that subsonic aircraft NOx emission significantly affectsnorthern China, which makes NOx at 250 hPa increase by about 50 pptv with the highest percentage of60% in 01-, and leading to an ozone increase of 8 ppbv with 5% relative change in 04-. The NOxincrease is mainly attributed to the transport process, but ozone increase is produced by the chemicalprocess. The NOx increases by less than 10 pptv by virtue of subsonic aircraft NOx emission over China,and ozone changes less than 0.4 ppbv. When subsonic aircraft NOx emission over China is doubled, itsinfluence is still relatively small.