Global Impact of Aircraft Emission on Ozone Concentrations and Methane Lifetime: Results from the 1999 IPCC Aircraft Assessment

  • Ivar S. A. Isaksen
Part of the NATO Science Series book series (ASIC, volume 557)


Model studies of the impact of aircraft emissions on global scale atmospheric ozone and on the methane lifetime has been performed as part of the 1999 IPCCassessment of aircraft emissions. 6 modelling groups participated, and extensive model studies with global scale CTMs, and one GCM were performed. The main emphasis in the study was on estimates of future (2015 and 2050) perturbations. Studies were also performed where sensitivities to model formulations of transport and chemical processes were done. The results of the studies showed that there were significant differences between the models, reflecting differences in the model formulations. The calculations show that ozone perturbation form aircraft emission occur predominantly in the Northern Hemisphere at mid and high latitudes. Maximum increase is found in the upper troposphere in the 10 to 12 km height region. The annual average increase in this region is estimated to be between 10 to 14 ppbv in 2015. All models show a near linear increase in global ozone perturbation with increasing NOx in the future. There is a reduction in the methane lifetime due to enhanced OH from NOx emissions. The change in the global methane lifetime is estimated to be -1.2% to -1.5% in 1992 from aircraft emissions, increasing to -2.3% to -4.3% in 2050. The ranges given for ozone and methane lifetime changes represent the ranges in the model estimates between the 6 models that participated in the study.


Lower Stratosphere Ozone Formation Ozone Production Atmospheric Ozone Global Ozone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media Dordrecht 2000

Authors and Affiliations

  • Ivar S. A. Isaksen
    • 1
  1. 1.Department of GeophysicsUniversity of OsloOsloNorway

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