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Activities of NASA's Global Modeling Initiative (GMI) in the Assessment of Subsonic Aircraft ImpactThe Intergovernmental Panel on Climate Change estimated a peak increase in ozone ranging from 7-12 ppbv (zonal and annual average, and relative to a baseline with no aircraft), due to the subsonic aircraft in the year 2015, corresponding to aircraft emissions of 1.3 TgN/year. This range of values presumably reflects differences in model input (e.g., chemical mechanism, ground emission fluxes, and meteorological fields), and algorithms. The model implemented by the Global Modeling Initiative allows testing the impact of individual model components on the assessment calculations. We present results of the impact of doubling the 1995 aircraft emissions of NOx, corresponding to an extra 0.56 TgN/year, utilizing meteorological data from NASA's Data Assimilation Office (DAO), the Goddard Institute for Space Studies (GISS), and the Middle Atmosphere Community Climate Model, version 3 (MACCM3). Comparison of results to observations can be used to assess the model performance. Peak ozone perturbations ranging from 1.7 to 2.2 ppbv of ozone are calculated using the different fields. These correspond to increases in total tropospheric ozone ranging from 3.3 to 4.1 Tg/Os. These perturbations are consistent with the IPCC results, due to the difference in aircraft emissions. However, the range of values calculated is much smaller than in IPCC.
Document ID
Document Type
Conference Paper
Rodriquez, J. M.
(Miami Univ. FL, United States)
Logan, J. A.
(Harvard Univ. Cambridge, MA, United States)
Rotman, D. A.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Bergmann, D. J.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Baughcum, S. L.
(Boeing Co. Seattle, WA, United States)
Friedl, R. R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Anderson, D. E.
(NASA Headquarters Washington, DC United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2004
Subject Category
Meteorology And Climatology
Meeting Information
Funding Number(s)
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