Aviation and the Global Atmosphere

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Figure 3-14: Correlation of mean annual contrail frequency and estimated May 1990 aircraft fuel usage above 7-km altitude. Contrail frequencies are based on 1993 to 1994 hourly surface observations from 19 stations in the United States of America (Minnis et al., 1997). The fit to the data (solid line) is shown. R is the correlation coefficient.

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